A Common Sense Approach to Selecting Bridge Sites
Transcript of A Common Sense Approach to Selecting Bridge Sites
Trail BridgesTrail Bridges – – A Common Sense Approach A Common Sense Approach
to Selecting Bridge Sitesto Selecting Bridge SitesPresenter:Presenter:
James “Scott” Groenier, P.E.James “Scott” Groenier, P.E.Project Leader, MTDC, WITProject Leader, MTDC, WIT
Prepared for: NOHVCC ConferencePrepared for: NOHVCC Conference Ontario, CA Ontario, CA
March 17, 2005March 17, 2005
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Technology & Development
IntroductionIntroduction Site ReconnaissanceSite Reconnaissance Geomorphology ConcernsGeomorphology Concerns Hydrology and HydraulicsHydrology and Hydraulics AlignmentAlignment Environmental Concerns Environmental Concerns Design LoadsDesign Loads Trail Bridge WebsiteTrail Bridge Website SummarySummary
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Technology & Development
Site ReconnaissanceSite Reconnaissance Site Investigation - simpleSite Investigation - simple
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Technology & Development
Site ReconnaissanceSite Reconnaissance Site Investigation - ComplexSite Investigation - Complex
Streambed strata
Floodplain widths
Soil types
Logs in stream
Ice Damage
Drift locations
Etc
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Technology & Development
Site ReconnaissanceSite Reconnaissance Site SurveySite Survey
Center of Stream
Edge of water
Bottom of Bank
Top of Bank
Floodplains
Trail
Utilities
Roads
Drift / Ice damage
Etc
Survey upstream and downstream for 300 ft
Survey approaches on both sides 150 ft
Survey top of banks for 30 ft
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Technology & Development
Site ReconnaissanceSite Reconnaissance Geotechnical InvestigationGeotechnical Investigation
Bedrock Loam
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Technology & Development
Geomorphology ConcernsGeomorphology Concerns
From Rosgen’s
“Field Guide for
Stream Classification”
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Technology & Development
Geomorphology ConcernsGeomorphology Concerns Stream StabilityStream Stability
Bedrock - Type A Channel
Stable Banks – Type B Channel
Deposition Area – Type C Channel
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Technology & Development
Geomorphology ConcernsGeomorphology Concerns Bank StabilityBank Stability
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Technology & Development
Hydrology and HydraulicsHydrology and Hydraulics Waterway AdequacyWaterway Adequacy
HydrologyHydrology +Regression Equations from USGS Reports on Estimating Frequency and Magnitude of Floods
=
Flow (CFS)
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Technology & Development
Hydrology and HydraulicsHydrology and Hydraulics Waterway AdequacyWaterway Adequacy
HydraulicsHydraulics
1) Take CFS from Hydrology
2) Take Site Investigation info
3) Take Site Survey
And
Use a computer model such as
HEC-RAS (River Analysis System)
Or
WinXSPRO
And you get this…..
HEC-RAS Example
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Technology & Development
Hydrology and HydraulicsHydrology and Hydraulics Flooding –Spring, Fall or rain on snowFlooding –Spring, Fall or rain on snow
Good or Bad Location?
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Technology & Development
Hydrology and HydraulicsHydrology and Hydraulics Navigational Navigational
ClearanceClearance
5 ft Minimum Required
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Technology & Development
Environmental ConcernsEnvironmental Concerns FisheriesFisheries
Spawning Areas, Fish passageSpawning Areas, Fish passage TES - ClosuresTES - Closures
SalmonSalmon Bull TroutBull Trout Cutthroat TroutCutthroat Trout etcetc
WildlifeWildlife Nesting Trees, Rearing areas, etcNesting Trees, Rearing areas, etc TES - ClosuresTES - Closures
Indiana BatIndiana Bat Bald EaglesBald Eagles Northern GoshawkNorthern Goshawk etcetc
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Technology & Development
Environmental ConcernsEnvironmental Concerns Ice FlowIce Flow Floating DebrisFloating Debris Falling TreesFalling Trees Falling RocksFalling Rocks Excessive Snow LoadsExcessive Snow Loads Avalanche ChutesAvalanche Chutes Springs/SeepsSprings/Seeps WetlandsWetlands OthersOthers
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Technology & Development
Design LoadsDesign Loads Dead LoadsDead Loads
SuperstructureSuperstructure DeckingDecking RailingRailing Wearing SurfaceWearing Surface Miscellaneous Miscellaneous
Utility LinesUtility Lines CoversCovers
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Technology & Development
Design LoadsDesign Loads Live LoadLive Load
Pedestrian – Pedestrian – 85 psf85 psf Equestrian Equestrian OHV’sOHV’s SnowmobilesSnowmobiles Mountain BikesMountain Bikes VehiclesVehicles
5,000 width <6 ft5,000 width <6 ft 10,000 6 ft<width<10 ft10,000 6 ft<width<10 ft
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Technology & Development
Design LoadsDesign Loads Snow Loads – Snow Loads – 0 psf to over 350 psf0 psf to over 350 psf
SNOTEL sites – SNOTEL sites – 550 to 600 in the West550 to 600 in the West Local Building OfficialsLocal Building Officials http://fsweb.mtdc.wo.fs.fed.us/snow_load/http://fsweb.mtdc.wo.fs.fed.us/snow_load/
Wind LoadsWind Loads OverloadsOverloads
GroomersGroomers 7600# - 18,000#7600# - 18,000#
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Technology & DevelopmentBridge TypesBridge Types
Trail Bridge CatalogTrail Bridge Catalog Forest Service Intranet - Forest Service Intranet -
http://fsweb.mtdc.wo.fs.fed.us/bridges/http://fsweb.mtdc.wo.fs.fed.us/bridges/ Forest Service Internet - Forest Service Internet -
http://www.fs.fed.us/na/wit/WITPages/bridgecatalog/http://www.fs.fed.us/na/wit/WITPages/bridgecatalog/
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Technology & DevelopmentBridge Bridge Fabrication/SupplyFabrication/Supply Structure produced by a certified Manufacturer Structure produced by a certified Manufacturer
for the type of material being used.for the type of material being used.- See “Contact Information For Wood and Steel Pedestrian and - See “Contact Information For Wood and Steel Pedestrian and Trail Bridges” at National Wood In Transportation WebsiteTrail Bridges” at National Wood In Transportation Website
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Technology & Development
SummarySummary Site ReconnaissanceSite Reconnaissance Geomorphology ConcernsGeomorphology Concerns Hydrology and HydraulicsHydrology and Hydraulics AlignmentAlignment Environmental Concerns Environmental Concerns Design LoadsDesign Loads Trail Bridge WebsiteTrail Bridge Website Questions?Questions?