Serving as Douglas County Emergency Management Under an ... River Flood Event... · Douglas County...

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East Fork Fire Protection District Serving as Douglas County Emergency Management Under an Inter-local Contract Carson River Flood Event Planning Project

Transcript of Serving as Douglas County Emergency Management Under an ... River Flood Event... · Douglas County...

Page 1: Serving as Douglas County Emergency Management Under an ... River Flood Event... · Douglas County has experienced all three types of flood events. Some with devastating results,

East Fork Fire Protection District Serving as Douglas County Emergency Management Under an Inter-local Contract Carson River Flood Event Planning Project 

Page 2: Serving as Douglas County Emergency Management Under an ... River Flood Event... · Douglas County has experienced all three types of flood events. Some with devastating results,

Carson Valley Flood Event Planning Project  1  

East Fork Fire Protection District

Carson River Flood Event Planning Project

Executive Summary Prepared by Tod F. Carlini, District Fire Chief

The East Fork Fire Protection District is charged with the responsibilities of Emergency Management for Douglas County, Nevada under an inter-local agreement between the Fire Protection District and Douglas County.

While there are many uncertainties regarding the potential of flooding along the Carson River in Douglas County and an El Nino driven weather situation which could produce abnormal potential for that flooding, including alluvial, riverine, and debris type flooding, the East Fork Fire Protection District has taken a lead role in the development of flood orientated contingency and response planning.

Douglas County has experienced all three types of flood events. Some with devastating results, such as was the case with the 1997 flood event. Most recently, the Johnson and Stephanie Lane community areas were heavily impacted with alluvial flooding following heavy rainfall in the Pine Nut Mountain Range, while the Fish Springs area actually saw debris/mudflow flooding in July of 2014. Debris from the 24,000 acre Bison Fire of 2013 contributed to this type of event. While not to deminimize the effects of flash flooding on the citizens and properties impacted by alluvial flooding, the attached work product and information gathering will focus primarily on the potential for riverine flooding, specifically along the East and West Forks of the Carson River as it flows through the Carson Valley. Consideration must also be made for a debris/mud flow type event due to the impacts of the 2015 Washington Fire in Alpine County. The information contained herein has been prepared from an emergency management perspective and represents the first phase of a two phase effort. As we attempted to design a functional Flood Response Guide, one of the first steps to assess the condition of the Carson River and evaluate conditions and hazardous, which under a flood situations, would either need to be addressed or at a minimum be identified as a concern. In meeting that objective our desire was to collect information from a core group of individuals, all with interests in the Carson River. Solicitations were made regarding concerns, problematic features, known weaknesses, and possible solutions more from a “practical” point of view, rather than from any type of specific engineering perspective. While

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environmental considerations are an absolute necessity when addressing any issues along a navigable water course, such as the Carson River, the primary focus was in terms of what potentially could be done as emergency measures and/or assess flood potential necessary for the development of a separate Flood Emergency Guide Manual. The 1997 Flood resulted in one fatality, forced the closure of much business, flooded over 50 homes throughout the valley, forced the evacuation of 140 citizens, isolated many of the valleys communities, destroyed millions of dollars of public infrastructure, and resulted in a total loss of $55,000,000. Several years of drought have left the Carson River chocked with new growth vegetation, sand and gravel islands and other deposits, and an overall loss of river channel capacity. The flood of 1997 saw flows of 23,000 CFS, which is 4 feet above flood stage. The information contained within this document and the recommendations made, are the by-product of conversations and discussions with what should be considered one of Carson Valley’s most important resources, that being its agricultural community and the interest and history that it represents. This work would not have been possible without collaborating with members from the agricultural community, the Washoe Tribe of Nevada and California, and other interests along the Carson River and Carson Valley. The primary objectives for the Fire Protection District are actually quite clear and will serve as a basis for the development of the Flood Response Guide which is a separate document, however, understanding these objectives as part of this project is important: They include:

Reduce the loss of life and property of residents and visitors due to flooding through response coordination and mitigation actions

Ensure the safety of all responders and participants in the response Support the residents, visitors, and businesses in prepare for, responding to and recovering from flooding Provide an efficient, comprehensive organizational structure for emergency response and recovery Coordinate ALL emergency operations within the county either with or without an official declaration Coordinate the use of available resources, be they public or private, including, local, state, and federal Recover from flood emergencies by providing for rapid and orderly damage assessment and providing necessary assistance to

the highest degree Establish a tiered activation of response levels following a deliberate and reliable situational awareness and input data from

credible sources

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Apply institutional knowledge, historical recollection, and recognize the roll that the agricultural community can plan in flood management in the Carson Valley

Secondary and complimentary to the development of a Flood Response Guide, this is also an attempt to document notes, comments, historical perspective, and to define and prioritize potential emergency project work along the Carson River. While the scope and responsibility of that work is vested with others, and strictly from an Emergency Management standpoint, this work may serve as a starting point for Carson Valley Conservation District, engineering disciplines, environmental specialist, and regulatory agencies in the future.

The executive management of the East Fork Fire Protection District would like to thank those members of the Carson Valley agricultural community and representatives from the Washoe Tribe of Nevada and California who participated in this endeavor.

Basic History

The Carson River is a northwestern Nevada river that empties into the Carson Sink, an endorheic basin. The main stem of the river is 131 miles (211 km) long although addition of the East Fork makes the total length 205 miles traversing five counties: Alpine County in California and Douglas, Storey, Lyon, and Churchill Counties in Nevada, as well as the Consolidated Municipality of Carson City, Nevada. The river is named for Kit Carson, who guided John C. Frémont's expedition westward up the Carson Valley and across Carson Pass in winter, 1844.

The 205 mile Carson River watershed encompasses 3,966 square miles and includes two major forks in the Sierra Nevada in its upper watershed region. The 74-mile-long East Fork rises on the north slopes of Sonora Peak (just north of Sonora Pass at about 10,400 feet in southern Alpine County, southeast of Markleeville in the Carson-Iceberg Wilderness. The 40-mile-long West Fork rises in the Sierras near Carson Pass and Lost Lakes at 9,000 feet elevation and flows northeast into Nevada, joining the East Fork about 1 mile southeast of Genoa. The Carson River then flows north 18 miles to the end of the upper watershed at Mexican Dam just southeast of Carson City. In the middle watershed the river runs generally northeast from Carson City across Lyon County, past Dayton. The middle watershed ends in eastern Churchill County at the Lahontan Dam. Here river flows are augmented by water from the Truckee River and stored in the Lake Lahontan reservoir. Downstream from the dam (in the lower watershed) much of the water is used for irrigation in the vicinity of Fallon, with limited flows continuing northeast into the Carson Sink.

Clear Creek, which begins at about 8,780 feet on Snow Valley Peak (Toiyabe National Forest, Carson Range) west of Carson City, is the only perennial tributary of the Carson River main stem, and is protected by the Nature Conservancy.

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Flood Types

There are actually three types of flooding that can impact Douglas County. They include main stem riverine flooding, alluvial fan flooding, and debris flow/mud flow flooding. Douglas County most recently experienced alluvial fan flooding and debris flow/mudflow flooding on the eastern side of the Carson Valley and in Southern Douglas County.

Main Stem Flooding Flooding of the main channel of a river involves flows that overbank and flood adjacent areas known as floodplains. A floodplain is generally described as a strip of relatively smooth land bordering a river that overflows at time of high water. Specific geomorphic features define a floodplain. For example, the Carson Valley is broad and flat due to the uplift and subsequent erosion of the Sierra Nevada, Carson, and Pine Nut Ranges as well as deposition of sediment carried by the Carson River at flood stage. Likewise, the Carson River channel looks more like a creek bed rather than a deep incised channel found in larger rivers across the Nation. Because the source of most of the stream flow originates from the mountain snowpack, the Carson River has not needed to incise its channel to accommodate snowmelt runoff but simply uses the floodplain as a discharge surface.

Alluvial Fan Flooding Alluvial-fan flooding occurs on alluvial-fan surfaces adjacent to the mountain block which are gently sloping; fan-shaped landforms created over time by deposition of eroded sediment, and are common at the base of mountain ranges in arid and semiarid regions such as much of the western United States (National Research Council, 1996). Flooding on alluvial fans is characterized by high-velocity flows, active processes of erosion, sediment transport and deposition, and unpredictable flow paths. This type of flooding is the result of intense cloudbursts from summer convective storms — common in Nevada.

Debris/Mudflow Flooding Unlike water flows where suspended sediment is insufficient to affect how water behaves, debris flows are characterized by a mixture of sediment and water where the flow becomes slurry similar to wet concrete. In steep canyons, debris flows can achieve high velocities (the rate of flow), transport large boulders in suspension, and cause catastrophic damage from impact or burial.

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Data Collection and Methodology While we are very well aware of the potential impacts of alluvial fan flooding, our efforts with data collection were focused on main stem or riverine flooding. Our approach was rather straight forward in the application of local and historical knowledge, observed river system conditions, and the most recent aerial photography. Participants were asked to discuss and identify issues and elements along the course of both the East and West Forks of the Carson River and their eventual convergent into one riverbed and flow. The scope of this work included points from the former Power Dam area on the East Fork, the Douglas County/Alpine County line of the West Fork to just beyond the Craddlebaugh Bridge as the river passes under U.S. Highway 395 in northern Douglas County. Once the information was collected, maps were produced which identified by number the particular issue or element of focus. Those items were then classified for planning, risk and hazard, and potential project work. Priority attention was also suggested specifically from an emergency management perspective or from group consensus on what should be considered and addressed as soon as possible.

The area being considered was divided into nine geographic areas with the following map reference titles supported by a map reference key. They include:

East Fork Dresslerville Riverview

Waterloo Minden Genoa

Carson Autumn Hills Foothill

Results and recommendations were then distributed amongst three categories. They included the flowing:

Project (Yellow): A project for the purposes of this document included areas or points within the river or associated ditch system(s) that have either been previously identified as potential projects or newly identified as potential projects. The “projects” listed have also be prioritized based upon risk vs. benefit analysis as they relate to the potential negative impacts if a significant flood event were to occur and impact critical infrastructure, life, and property.

As an example for an area or point defined as a “Project,” the picture to the left shows the existing condition were the Virginia Ditch crosses beneath U.S. Highway 395, south of Gardnerville, Nevada. Opinion, consensus, and historical data all support the installation of a gate device of some type at this location to prevent river overflow conditions which “charge” the Virginia Ditch causing flows to pass under the highway and threaten Carson Valley Medical Center and long term care facilities on the east side of the highway.

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Hazard (Red): A Hazard area or point for the purposes of this document includes those locations along the river system which either currently or could with an event create a significant hazard and have the potential for increasing the threat to life, property, and critical infrastructure.

.

As an example for an area or point defined as a “Hazard,” the picture to the right shows one of the most significant concerns, i.e. snags and debris. While the Carson Valley Conservation Districts has made significant progress in this area, much more work is required. Snags and debris of this nature, under flood conditions, create significant hazards as they are carried down river and impact several bridge and crossing locations on both forks of the river. The removal and /or size reduction is a critical measure that can reduce the hazard to a high degree.

As another example for an area or point defined as a “Hazard,” the picture to the left shows another concern, i.e. sand and gravel bars. Additional consideration must be made to remove sand and gravel bars and new growth vegetation in some cases, which have significantly reduced the river channel capacities to volumes less than those prior to the 1997 Flood Event

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Mitigation (Blue): A Mitigation area or point for the purposes of this document includes those locations along the river system where a more deliberate approach may be taken to correct or otherwise “mitigate” a condition which under flood status could contribute to additional flood related issues.

Special Consideration It is important to note that all three classifications used to define potential concerns along the East and West Forks of the Carson River and the confluence of those two branches into the Carson River each present very specific challenges, those noted as “Mitigation” also take into account environmental considerations. This is not to say that those listed as a “Hazard” or as a “Project” don’t have environmental or in some cases cultural considerations. They do, but once again, this document is prepared from an Emergency Management standpoint, where by the ability to address those areas as soon as possible will potentially have or create significant benefits which in turn may reduce the threat to life, property and critical infrastructure.

The East Fork Fire Protection District encourages the immediate collaboration with the Carson Valley Water Sub-Conservancy, the Nevada Department and Environmental Protection, United States Army Corp of Engineers, the Washoe Tribe of Nevada and California, and other environmental groups with either specific authority or interest in the Carson River’s ecosystem and culture. The Carson River is one of the most important natural resources which must be protected and maintained. The work that appears to be

As an example for an area or point defined as a “Mitigation,” the picture to the right shows area where rock and gravel bars have developed along with new growth vegetation. In some cases, these areas allow for the redirection of the river course and bank erosion Bank reconstruction, stabilization, and replanting of appropriate vegetation all can assist with flood mitigation and contribute to a “healthy” river ecosystem.

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necessary related to riverine flood management needs to be pursued. In some cases the work required or recommended needs to be completed without delay. In other cases, a much more deliberate approach is recommended. Even in those cases where immediate attention is needed, opportunity to revisit “emergency actions and measures” should be provided to address any future environmental or ecological issues that may result due to the emergency actions taken.

Results and Recommendations 49 issues, areas of concern, hazards, and/or potential project work were identified. Following is that list which is supported by the attached corresponding maps.

MAP POINT

MAP AREA ELELMENT/ISSUE IDENTIFIED ELEMENT TYPE PRIORITY

1 East Fork Install Flood Gauge Device at Bridge Project Moderate

2 East Fork Sand and gravel bar removal Mitigation

3 East Fork Contact USGS and request activation of gauge device Project High

4 East Fork Potential Breach Point Hazard

5 East Fork Drainage Capacity Issue at Smelter Creek and US 395 - Possible overflow point

Hazard

6 Riverview Potential Breach Point Hazard

7 East Fork Potential Breach Point Hazard

8 Riverview Possible Dike Construction Site Project High

9 Riverview Public Utility Threat – Power and Communications Hazard

10 Riverview River bank erosion. River course/bank reestablishment/reinforcement. Washoe Tribal Land protection

Mitigation

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11 Riverview River bank erosion. River course/bank reinforcement, clearing and snagging area. Washoe Tribal Land protection

Project Extremely High

12 Riverview River bank erosion. River course/bank reinforcement, clearing and snagging area. Washoe Tribal Land protection

Project Extremely High

13 Riverview River bank erosion. River course/bank reinforcement, clearing and snagging area. Washoe Tribal Land protection

Project Extremely High

14 Riverview River bank erosion. River course/bank reinforcement, clearing and snagging area. Washoe Tribal Land protection

Project Extremely High

15 Riverview Possible Breach Point Hazard

16 Riverview Possible Culvert Capacity/Overflow Point Hazard

17 Riverview Possible Culvert Capacity/Overflow Point Project Extremely High

18 Riverview Possible Culvert Capacity/Overflow Point Hazard

19 Riverview Soft plug location- Riverview Bridge Hazard

20 Riverview Drainage Point back to River Mitigation

21 Riverview Company Ditch - Open Draining access to east side of U.S.395 Project Extremely High

22 Riverview Inundation area with entrapment (mud) potential Hazard

23 Riverview Bank Erosion – Bank Stabilization/Restoration Mitigation

24 Riverview Bank Erosion / Stabilization/Restoration Mitigation

25 Riverview Possible Capacity Issue Hazard

26 Riverview Possible Choke Point Hazard

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27 Riverview Possible Choke Point – Restricted Under Bridge Clearance – Under bridge clearing

Project High

28 Riverview Possible Isolated Critical Infrastructure – Community Center/Evacuation Center

Hazard

29 Minden Choke Point Hazard

30 Minden Inundation area with large population potential Hazard

31 Minden Channel clearing and snagging Project High

32 Minden Choke Point Hazard

33 Minden Possible Flow Capacity Issue/Overflow and Isolation Hazard

34 Minden Channel Clearing and Vegetation Removal Project High

35 Minden Channel Clearing and Vegetation Removal Project High

36 Foothill Evaluate Diversion Structure Mitigation

37 Autumn Hills Breach Point – Water over Roadway – Possible Isolation Point Hazard

38 Autumn Hills Choke Point Hazard

39 Autumn Hills Beaver Dam – Flow Restriction Mitigation

40 Autumn Hills Possible Culvert Capacity – Overflow Hazard

41 Foothill Possible under bridge capacity – Under bridge clearing Hazard

42 Autumn Hills Breach Point with spill out Hazard

43 Autumn Hills Breach Point with spill out Hazard

44 Autumn Hills Beaver Dam – Flow Restriction Mitigation

45 Genoa Beaver Dam – Flow Restriction Mitigation

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46 Genoa Breach Point/Overflow/ Possible Isolation Condition Hazard

47 Genoa Breach Point/Overflow/ Possible Isolation Condition Hazard

48 Genoa Mountain Run Off – Road Wash out potential Hazard

49 Carson 395 Possible Overflow – US 395 – Access and Isolation Condition Hazard

Final Acknowledgment The East Fork Fire Protection District and Douglas County Emergency Management would like to acknowledge the following individuals for their invaluable contributions to this effort. Without their participation, knowledge, historical perspective, and most importantly, their passion and appreciation for the agricultural interest of the Carson Valley and the important part that the Carson River plays, this work product would not have been possible.

Contributing Individuals:

Andy Aldax Brett Reed Brian Crocket Brian Parks Charlie Condron

Charlie Hone Clarence Burr Craig Burnside Dave Doughty Peter Knight

Eric Rieman Gary Aiazzi J.B. Lekumberry James Settelmeyer Mark Neddenrip

Frank Godecke Tom Brooks Bob Chichester Stan Smokey Fred Stodieck

Julian LaRoy

Washoe Tribe of Nevada and California

Neal Mortimore, Tribal Chairman Norm Harry, Environmental Program Director

Carson Valley Conservation District

Mike Hays, Coordinator

Carson Water Sub Conservancy District

Ed James, Director

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Carson Valley Flood Event Planning Project  12  

Douglas County

Greg Lynn, Commissioner Steve Thaler, Commissioner

East Fork Fire Protection District

Tod F. Carlini, District Fire Chief Steve Eisele, Deputy Fire Chief

Douglas County GIS

Eric Schmidt, GIS Manager Matt Richardson, GIS Technician

Funding

This project was funding under a Planning Grant from the Nevada Division of Emergency Management and by the East Fork Fire Protection District.

For Additional Information:

East Fork Fire Protection District 1694 County Road Minden, Nevada 89423 775-782-9040 Carson Valley Conservation District 1702 County Road – Suite A Minden, Nevada 89423 775-782-3661 Washoe Tribe of Nevada and California 919 U.S. Highway 395 South Gardnerville, Nevada 89410 775-265-8682

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WHEA

D DR

MONU

MENT

PEAK

DR

TOPAZ LN

GLENWOOD DR

LANGLEY DRPOLLEN CT

BUTLER CT

BREN

TWOO

DCT

JOBS PEAK DR

BROOKE WY

TOPAZ LN

JODI CT

BOY

ST/M

EHU

STAR

LIGHT

CT

LINDA

ANNE

CT

MORN

ING

STAR

CT

NIBLICKDR

EVENINGSTAR LN

EAST

VALL

EY R

D

REDHAWK LN

ANTARES

AV

TYNDALLWY

BITTERBRUSH CT

KERRY LN

MULLERPY

HONEYBEE LN

ROBINDR

LI NDA

D RHASTINGS

LN

REDW

OOD CI

BANNER DR

ARRO

YO D

R

FALSTAFF LN

FIFTHGREENCT

BRAN

DEN

LN

RUSSELLW

Y

MACE

N NA

L NST

ODI C

KLN

GODECKE LNST

ONEG

ATE C

T

LADERA LN

JO LN

WESTMINSTERPL

RANCH DR

DRURY LN

SUBSTATION DR

TIMBER CT

SOLITUDE LN

ANNKIM CI

SILVERANCH DR

S ORCHARD RD

PINENUT CT

DEAN

DR

WENNHOLD LN

CENTER VILLEL N

ELGE

S AV

DRES

SLER

VILLE

RD

TILLM

AN LN

N MARION RU

SSEL

L DR

KINGS LA NE

SERVICE DR

MULLERPY

MULLER PY

PIN OAK DR

KIMMERLING RD

KIMMERLING RD

LASS

EN W

Y

EAST

VALL

EY R

D

BUM BLEBE E D R

TOIYABE AV

BLUEROCK RD

SHOR

T CT

WHEELER WY

FAIRW

AY D

R

MAMMOTH WY

HORNET DR

HORNET DR

WINDSOR DR

MERINO

CI

GOLDENEA GLECT

MITC

H DR

RITTER DR

BOLIVIA WY

WHITN

EY W

Y

MAIN RIVER RD/WATASHEAMU

AS PEN

BRO OKLN

CHOKECHERRYCT

EAST

PEAK

LN

ALICIACI

LONG CT

PENN LN

CAHICI

VILL AGE WY

MEADOWVIEWRD

INDUSTRIAL WY

WILL

OWCR

EEK L

N

WAGON DR

PURPLESAGE DR

SCOTI LN

SUNSET CT

PALISADE CI

SELKIRK CI

SANCHEZ RD

MA

RK CI

M AR K CI

DECK

ER R

D

MARLETTE CI

MARLETTE CI

WILLOW

CREEK LN

Allerm

an Ca

nal

Allerm

an Ca

nal

Smelter Creek

Virginia Canal

Virgin

iaCa

nal

Upper Allerman Canal Runoff

Runoff

Rocky Slough

Pipeline

Pipeline

Pipeline

MartinSlough

Lowe

r Alle

rman

Can

al

LampeDitch Irrigation

Pipeline

IrrigationPipeline

IrrigationPipeline

Irriga

tion

Pipelin

e

IrrigationPipeline

IrrigationPipeline

Hyflye

r Ditch

Henningsen Slough

Ezell

Ditch

Edna Ditch

Edna Ditch

Diversion

Diversion

Detentio

n Pond

Detention Pond

DetentionPond

CottonwoodSlough

Cottonwood Slough

Company

Ditch

Company Ditch

CRiver

CRiver

Buck

eye D

iversi

on D

itch

PAU-WA-LUMIDDLE SCH

SCARSELLIELEM SCH

LAMPEPARK

RANCHOSASPEN PARK

UNR AG EXTENSION

GARDNERVILLETOWN WATER

TOWN OFGARDNERVILLEOFFICE

TOWN OF GARDNERVILLEOFFICE

DC WEEDCONTROL

DC PARKS& REC

DC SHERIFFSUBSTATION

STODICKPARK

EFFPDSTATION 7

CC MENELEYELEM SCH

WASHOE TRIBEMEDICALCENTER

SENIORCITIZENSCENTER

POST OFFICE -GARDNERVILLE

CARSON VALLEYMEDICALCENTER

15

27

4

5

7

9

10

11

1213 14

15

16

17

18

1920

21

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DOUGLAS AV

TRANCE ACRE DR

OLD

NEVA

DAWY

MANHATTAN WY

VERDE WY

WINTER GREEN DR

DOUGLASAV

SIERRA VISTA

DR

SOUTH CT

HIG

H SCHOOL ST

HWY

88

ELLIE'S PL

EAST

ONLN

KYNDAL WY

SWEE

TW

ATER DR

MARR

ONWY

CASTLELN

PIT RD

BELMONT

CT

KINGSLANE

SILVERANCH DRSIE

RRAVIS

TACT

CABERNET CT

MONARCH LN

SPRINGFIELD

DR

FIELDGA

TEWY

MILL ST

COURTHOUSE ST

COBB

LESTO

NEDR

REDWO OD

CI

JODICTBO

BWIRE

LN

private

KIMMERLING RD

AZUL WY

CUTTER WY

SORENSEN LN

ROJO

WY

MAPLE ST

TOPAZ LN

RUBIO WY

KINGS

LAND

CT

unna

med

RUBIO

WY

MILLCREEKCI

MARI

ANNE

WY

WATERLOO LN

DRAY

TON B

L

MAD

CAP L

N

priva

te

AMARILLO DR

WENNHOLD LN

RANCH DR

HOME RANCH

RD

EDNA DR

private

ORO WY

WILH

ELM

PL

MOTTSVILLE LN

priva

te

DUCK POND RD

WATERLOO LN

CENTERVILLE

LN

KINGSTON LN

RUBIO

WY

ROCKY TERRACE DR

BOLIVIA WY

BIGJAKECT

BERN

ING

WY

WCOTTAG E

LP

JES S ICALN

MARR ION WY

drive

way

drivewayMEADOWLARK CI

COUNTRY LN

COUN

TRY L

N

ASPEN LPdriv ewa y

West

Fork

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r

West Fork CRiver

Stodie

ck D

itch

Rocky Slough

Rocky Slough Rocky SloughRocky Slough

Rocky Slough

Rock

Divers

ion

Rock Diversion

RockDiversion

MartinSlough

Lund Ditch

Island Ditch

Irriga

tion

Pipelin

e

IrrigationPipeline

IrrigationPipeline

Irrigation Pipeline

Home Slough

Henningsen Slough

HenningsenSlough Henningsen Slough

Edna

Ditch

Edna Ditch

Dryer pipeline

Dryerpipeline

DryerDitch

Divers

ion

DetentionPond

DetentionPond

DetentionPond

Cottonwood Slough

Cottonwood SloughCottonwood Slough

Cottonwood Slough

Cottonwood Slough

CRiver

CRiver

CRiver

Brockliss Slough

EFFPDSTATION 2

GARDNERVILLETOWNPARK

TOWN OFGARDNERVILLEOFFICE

DC SHERIFFSUBSTATION

GARDNERVILLETOWN PARK

SENIOR CITIZENS CENTER

POST OFFICE -GARDNERVILLE RANCH

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AUT U

MNHI

LLS RD

WEST

FORK

V ISTA

LN

CENTERVILLE LN

FRICKECT

CLAIRECT

SHERIDAN LN

DRESDEN LN

DINO CT

EVA CT

BUENAVISTA CT

PLUM CT

FORESTVIEWDR

RUSSELLWY

DINA CT

JONES LN

LILLIAN CT

NICHO

LEWY

unnamed

ASPEN HILL

CT

PEACH CT

OLDFOOTHILL RD

ALEXCT

EVAN

CT

JOBE CT

TYCOON CT

CORIECT

MERLYN CT

TRANCE ACRE DR

PHILLIPS WY

ELLIS LN

MOTTSVILLE LNPEPI'S DR

DIORITE RD

MOUNTAINREACH CT

MARSHA LN

TAYL

ORCR

EEK RD

GEO R

GIA

LN

CUTTIN-LOOSE LN

IRMA LN

JONES

RANCH

RD

SUMM ER HILLS RD

BARBER WY

TAM BOUR

INE RANCH

RD

ALLERMAN LN

WILFREDWY

ARTEMESIA LN

DUCK POND RD

BASS WY

SIERRA COUNTRY CI

HANSON LN

FOOT

HILL

RD

FOOTHILL RD

F IV E CREEK RD

GOAWY

CANYONCR

EEKCT

SIERRA SHADOWSLN

BOLLEN CI

NATURES EDGE RD

KINGSBURYGRADE

TRANCEDR

SUMMIT RIDGEW

Y

CARY CREEK CT

FOREST HILLWY

INDIAN TRA ILRD

BEVERL YWY

SHAD

OW MOUNTAINCI

DELO

RES W

Y

EAGLE MEADOWS LNWEST

FORK VISTALN

MOTTSVILLE MEADOWS WY

Big Ditch

Big Ditch

Barber Cree

k

Wheeler

Creek

West

Fork

CRive

r

West

Fork

CRive

r

West Fork CRiver

Sheridan Creek

Scossa Spring

Runo

ff

Runoff

Runoff

Runoff

Runoff

Runoff

Runoff

Runoff

Runoff

Runoff

Runoff

Runo

ff

Runoff

Runoff

Runof

f

Runoff

Runoff

Runo

ff

RunoffPipeline

Pipeline

Pipeline

Park and Bull Ditch

Park and Bull Ditch

MottsCreek

MottsCreek

MottsCreek

Johnson Slough

Johnson Slough

Jobs Creek

Detention

PondDetention

Pond

DetentionPond

Detention

PondDetention

Pond

Detention Pond

Brockliss Slough

Brockliss Slough

Broc

kliss

Slou

gh

Brockliss Slough

EFFPDSTATION 8

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TRANCE ACRE DR

GARDN ERST

NHW

Y39

5

EDDY ST

N HWY 395

BELLAC ASA

DR

CEDARCREST

DR

DOUGLASAV

BUCKEYE RD

TORINA WY

LILACCT

SOUTH CT

MAHO

GANY

DR

IRONWOOD DR

BURR

UKI A

ST

A RBEL

LODR

ZALDIA DR

SPRUCE ST

EIGHT

H ST

CHUR

CHST

NINTH

ST

HWY

88

LASSO LN

MONTERRA DR

DOUGLAS AV

COUNTY RD

unna

med

OX YOKE CT

ROSS

O CT

BEHIA

CI

CASTLELN

KINGSLANE

SNAFFLE BIT D

R

LUPINE CI TAMARACK DR

OAKWOOD DR

BOUGAINVILLEA DRTH

IRDST

IRIS C

T

MILL ST

MONT

EVIS

TA AV

IRONWOOD DR

OLUA

ST

ZEROLENE RD

HEATHERCI

CUTTER WY

GARDENGLEN

LARCHWOODWY

BELARRA DR

CARVALCT

MONTECITO DR

MILLCREEKCI

LASBRISAS

DRSHAMROCKCI

BALER ST

ZEROLENE PL

MAD

CAP L

N

alley

HWY

88

MULLER PY

WILH

ELM

PL

FRIEDA LN

MULLER LN

private

GILMAN AV

AZUR

E DR

ASPENGROVE

CI

LACI TA

W Y

HEYB

OURN

E RD

WILDROSE DR

LUCE

RNE ST

LINDE N

CT

WISTERIA DR

WHITEOAK LOOP

DESERET DR

WESTWOODDR

MON TEVI STA

AV

BERN

ING

WY

JES S ICALN

MAHOGANY

CI

alley

LON G

L EA F

P L

HOME RANCH RD

ASPEN LP

driv ewa y

Virginia Canal

StormDrain

StormDrain

StormDrain

Sewe

r Pon

d

Sewe

r Pon

d

Rock

Divers

ion

RockDiversion

Poleline Ditch

Polel

ine D

itch

Poleline Ditch

Poleline Ditch

Middle Ditch

Middle Ditch

MartinSlough

MartinSlough

Martin

Slou

gh

Martin Slough

MartinSlough

Island Ditch

IrrigationPipeline

IrrigationPipeline

Irriga

tion

Pipelin

e

Irrigation Pipeline

IrrigationPipeline

IrrigationPipeline

Home Slough

Home Slough

Heyb

ourne

Ditc

h

Ferris Ditch

Ferris Ditch

Ferris Ditch

East

Ditch

Dryer pipeline

Dryerpipeline

Dryer Ditch

Drain

age

Pipelin

e

Drain

age

Ditch

Drainage Ditch

Divers

ion

Deten

tion

Pond

DetentionPond

DetentionPond

DetentionPond

DetentionPond

Deten

tion Po

nd

DetentionPond

DetentionPond

Deten

tionPo

nd

Deten

tion

Pond

DetentionPond

Cottonwood Slough

Cottonwood Slough

Cottonwood

Slough

Cottonwood Slough

Cottonwood Slough

CRiver

CRiver

CRiver

DOUGLASHIGHSCHOOL

MINDEN PARK

MINDEN/GARDNERVILLESANIT DIST

EFFPDSTATION 2

MINDEN INNCVICHALL

DC JUDICIALBLDG

EFFPD STATION 1

DC LIBRARY

WESTWOOD PARK

DC SWIMCENTER

CARSON VALLEYMIDDLE SCHOOL

GARDNERVILLETOWN PARK

TOWN OFGARDNERVILLEOFFICE

EFFPDPARAMEDICSTA

CIRCLE DRIVE PARK

MINDENELEM SCH

MINDENMEDICALCENTER

SENIOR CITIZENS CENTER

POST OFFICE- MINDEN

TOWN OF MINDEN OFFICE

DC HUMANSERVICES

DISPATCH & GIS

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WOODYSPL

PLUM CT

OLDFOOTHILL

RD

NICHO

LEWY

ASPEN HILL

CT

PEACH CT

TRANCE ACRE DR

PEPI'S DR

TAYL

ORCR

EEK RD

LAURA SPRIN GS CI

MOTTSVILLE LN

SUNDANCE LNPINECREEKBAS IN RD

ALLERMAN LN

MULLER LN

HANSON LN

KINGSB

URY G

RADE

FOOTHILL RD

FOOTHILL RD

TRANCEDR

BEVERL YWY

DELO

RES W

Y

Big Ditch

Willia

msSlo

ugh

Willia

ms Sl

ough

West

Fork

CRive

r

West Fork CRiver

West Fork CRiver

Uppe

r Broc

kliss S

lough

Upper

Brockl

issSlo

ugh

Runo

ff

Runoff

Runoff

Runoff

Runof

f

Runoff

Runoff

Runoff

Runoff

Runo

ff

Runoff

Runoff

Runoff

Runoff

Rock Diversion

PolelineDitch

Middle Ditch

Lower Brockliss Slough

Johnson Slough

Johnson Slough

Home Slough

Home Slough

CRiver

CRiver

CRiver

Brockliss Slough

Brock

liss Sl

ough

36

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driveway

MEAD

OWLA

RKLN

VALL

EY VI

EW DR

MILL ST KINSE

Y WY

CARSON ST

GENOAASPEN

CT

OLD BARN RD

NELLIE LN

TRAIL CT

MARGERY LN

PIONE

ERTR

RANC

H HOU

SE RD

HOLTON CT

AME R ICANEAGLECT

FIRST ST

BLESSING WY

FOOTHILLMEADOWSCT

LIMOUSIN CT

driveway

GENOA LAKES DR

GENOA LN

SCHOOL HOUSEDR

WATER CANYON RD

ADAMSRANCH RD

WILLOW

BEND

RD

JACK

S VAL

LEY R

D

JACK

SVA

LLEY

RD

CANDYDA

NCE L N

FOOT

HILL R

D

FOOTHILL RD

EAGLERIDGE RD

GENO

A HIGH

LANDS DRGENOA ASPEN DR

GENO

AASP

ENDR

pr ivate

CENT

EN

NIAL

DR

GENOA

HEIGHTS LN

GENOA

HIGHLANDSCI

DEER

HAVE

N

GENOAMEA DO WS CI

EAGLE

RIDGE RD

EAGL

E RIDGE

RD

drivew

ay

DEER

HAVEN

DEER

HAVE

N

GALEPPI LN

GALE

PPI L

N

Willia

ms Sl

ough

Willia

ms Sl

ough

Willia

ms Sl

ough

Williams Slough

West

Fork

CRive

r

Uppe

r Broc

kliss S

lough

Runoff

Runoff

Runoff

Runoff

Runoff

Runoff

RockDiversion

RockDiversion

Rock Diversion

Middle Ditch

Middle Ditch

Lowe

r Broc

kliss S

lough

Home Slough

East Ditch

EastDitch

Drain

age D

itch

DrainageDitch

DrainageDitch

Drainage Ditch

Drainage

Ditch

Drainage Ditch

Diversion CRiver

CRive

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Broc

kliss

Slou

gh

Bridge

TOWN OFGENOAOFFICE

MORMONSTATIONPARK

GENOATOWN PARK

EFFPD STATION 3

POSTOFFICE -GENOA

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PLYM

OUTH

DR

VI STA

G RA N

D EBL

N HW

Y 39

5

S SUN

RIDG

EDR

VOIGHT CANYON DR

ORECT

GRANITECT

VISTA HILLCTAMADORCT

OVERVIEWCT

SUNUP CT

CHIP CREEK

CTPLACER CT

CLAR

K ST

BERN

ESE

CT

POWERS AV

JAME

SL E

EP A

R K

RD

JOHNSON LN

HILLSIDE D R

JACK

S VAL

LEY R

D

TENNANT LN

NOBLE'S CT

TAMA

RA C

T

HITE CT

STEPHANIE WY

FERRIS DR

LONG

DR

CLOUDB

URST CANYON DR

AMADORCI

RAN

CHVIEW CI

COLOMA DR

COLO

MA D

R

DOG

LEG DR

SOMERSET WY

HARRIS RD

LEHIGH CI

DEER

HAVEN

PROMONTO

RY DR

Williams Slough

Runo

ff

Runoff

Runoff

Runoff

Runoff

RockDiversion

RockDiversion

RockDiversion

Heyb

ourne

Ditc

h

East

Ditch

DrainageDitch

Drainage Ditch

Drainage Ditch

Drainage

Ditch

CRive

r

CRiverCRiver

Bridge

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Ditches NBMG '97 Flood Extents