NH Stream Crossing Initiative Brochure - New Hampshire · a p e e - R a g g e d - K e a r s a r g e...
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Stream crossings – where the river meets the road • Any locaon where a road intersects a waterway requires a stream crossing to convey the water under the road. • There are approximately 20,000 stream crossings in New Hampshire. • Many are old, damaged and undersized, and need to be assessed and replaced. Undersized culverts present a public safety hazard • Undersized culverts can’t handle large stream flows and will cause flooding during heavy rain events or sudden snow melts. They are also prone to becoming blocked, further increasing likelihood of flooding. • When water overtops a culvert, it can quickly erode road fill material, leading to washouts. This leads to stranded homes, expensive road repairs and impaired rivers and streams due to sediment being deposited into the water. PUBLIC HAZARD New Hampshire Department of Environmental Services Flood Hazards Administrator: [email protected] Migaon Program Specialist: [email protected] Wetlands Migaon Coordinator: [email protected] New Hampshire Department of Transportaon [email protected] New Hampshire Fish and Game Department Fish Habitat Biologist: [email protected] Homeland Security and Emergency Management [email protected] More informaon Stream Crossings: hps://www.des.nh.gov/organizaon/ divisions/water/wetlands/streams_crossings.htm ARM Program: hps://www.des.nh.gov/organizaon/ divisions/water/wetlands/wmp/ HSEM Hazard Migaon Planning: hps://apps.nh.gov/blogs/hsem/?page_id=839 CONTACTS NEW HAMPSHIRE STREAM CROSSING INITIATIVE Road washout in Jackson, NH Produced by NHDES and distributed by the Interagency Outreach Commiee
Transcript of NH Stream Crossing Initiative Brochure - New Hampshire · a p e e - R a g g e d - K e a r s a r g e...
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Data from NH GRANIT as of September 2015.NH GRANIT and cooperating agencies make no claimto validity or reliability or to any implied uses of these data.Topographic base: © 2013 National Geographic Society
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Stream crossings – where the river meets the road
• Any location where a road intersects a waterway requires a stream crossing to convey the water under the road.
• There are approximately 20,000 stream crossings in New Hampshire.
• Many are old, damaged and undersized, and need to be assessed and replaced.
Undersized culverts present a public safety hazard
• Undersized culverts can’t handle large stream flows and will cause flooding during heavy rain events or sudden snow melts. They are also prone to becoming blocked, further increasing likelihood of flooding.
• When water overtops a culvert, it can quickly erode road fill material, leading to washouts. This leads to stranded homes, expensive road repairs and impaired rivers and streams due to sediment being deposited into the water.
PUBLIC HAZARD
New Hampshire Department of Environmental Services Flood Hazards Administrator: [email protected] Program Specialist: [email protected] Mitigation Coordinator: [email protected]
New Hampshire Department of Transportation [email protected]
New Hampshire Fish and Game Department Fish Habitat Biologist: [email protected]
Homeland Security and Emergency [email protected]
More informationStream Crossings: https://www.des.nh.gov/organization/divisions/water/wetlands/streams_crossings.htmARM Program: https://www.des.nh.gov/organization/divisions/water/wetlands/wmp/HSEM Hazard Mitigation Planning: https://apps.nh.gov/blogs/hsem/?page_id=839
CONTACTS
NEW HAMPSHIRE STREAM CROSSING
INITIATIVE
Road washout in Jackson, NH
Produced by NHDES and distributed by the Interagency Outreach Committee
11
4A
4A
4A
4
4
EaglePond
Rd
Powers Ln
Clar
ke R
d
Walker
BrookR
d
Tewksbury
Rd
Cross
Hill Rd
Kimball Ln
Sawyer Rd
Pleasant
Rd
JonathanDr
Atw
ood
Rd
Whitney
Broo kR
d
O ld Nor th R d
Roc k
yAcres Rd
Jack Wells Rd
FoxFarmR
d
Forty Acres Rd
Ste a
rns
Rd
Whites Pond Rd
PinnacleR
d
New
Can
ada
Rd
StewartRd
Pedrick Rd
Elkins Hill Rd
Hob
bsH
illR
d
Wilm
otCe
nter
Rd
Roy
Ford
Rd
Fraz
ierRd
Wigg
in Rd
Cam
p grou ndR
d
Bree
zyH
il lR
d
North
Wi lm
otR
d
Rich
ards
Rd
Bunk
e r H
ill Rd
Lockwood
Rd
Granite Hill Rd
Tur key Hil lR un
Popl
a rSt
Teel Farm Rd
Pound Rd
Patte
rson
Rd
Grace
Rd
wm
u I1
wm
uG
1
Suna
pee-
Ragged-Kearsarge
Green
RaggedRaggedMountainMountain
BogBogMountain CEMountain CE Ray,Ray,
M. #1M. #1
CookCookEasementEasement
Roger W.Roger W.BirnbaumBirnbaumEasementEasement
WalkerWalker
HopeHope
ChamberlinChamberlin
Ray,Ray,M. #2M. #2
Wood, B.Wood, B.
Rosemary'sRosemary'sWoodsWoods
HopeHopeForestForestRay,Ray,
O. + A.O. + A.
HopeHopeForestForest
RaggedRaggedMountain FishMountain Fish& Game Club& Game Club
Hall #2Hall #2
Wood,Wood,D. #2D. #2
Wood,Wood,D. #1D. #1
DemingDeming Bog PondBog PondParcelParcel
Thompson,Thompson,et alet al
WebbWebb
Copyright:© 2013 National Geographic Society, i-cubed
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Data from NH GRANIT as of September 2015.NH GRANIT and cooperating agencies make no claimto validity or reliability or to any implied uses of these data.Topographic base: © 2013 National Geographic Society
0 0.5 1Kilometers
NEW LONDONUSGS 7.5' Quad- Tile: 120NE
WILDLIFE AND SAFETY – A ROAD TO SUCCESS
Improperly designed culverts create barriers to fish and other wildlife
• Under-sized culverts can increase water velocity and prevent a natural streambed from forming inside the structure. Fast-moving water and lack of natural eddies and protected areas can prevent passage for smaller aquatic animals.
• Elevated or perched culverts can prevent any animal passage – many local aquatic species need to move freely in a stream to complete their life cycles.
New Hampshire Stream Crossing InitiativeProject partners are working to address flood risks and make our infrastructure more resilient through a proactive approach by identifying and replacing problem culverts before they can fail and cause damage. Identifying crossings for replacement that will maximize ecological benefits while addressing infrastructure safety can save money and help to restore aquatic habitat in the long run.The goal is to assess and prioritize which crossings are the best candi-dates for replacement to improve public safety, infrastructure resilience and aquatic habitat restoration.
Replacing culverts for watershed restoration
• Removing crossings that are barriers to fish and wildlife contributes to watershed restoration goals. Waterways will be reconnected and both water quality and stream habitat will be improved.
• A suitable crossing will span the stream banks and have similar water flow, depth and substrate to the natural stream.
• A properly designed stream crossing can accommodate fish and wildlife passage and stream channel adjustments, while reducing flood hazards and expensive damage by allowing for flood flows.
Success Story – Falls Brook, Swanzey, NHA six-foot corrugated metal culvert originally served as the crossing structure for Hale Road. It was identified as a priority replacement due to the amount of quality cold-water habitat within the stream reach and because it posed a potential hazard to the community during extreme storm events.The goals of the project were:
• Improving aquatic organism passage.• Improving geomorphic compatibility with the
stream.• Improving flood resiliency.
In 2016, the culvert was replaced with a 24-foot aluminum arch culvert, consistent with bankfull measurements. The streambed was restored and the downstream banks were planted with trees and vegetation to ensure stability.
The Falls Brook project was partially funded through a NHDES Aquatic Resources Mitigation (ARM) grant to the Cheshire County Conservation District, in partnership with Trout Unlimited, NH Fish and Game and others.
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