Fish Passage Site 20401301
Coordinates (dec. deg.): 61.53214°, -149.52786°
Legal Description: S017N001W30
Region: South Central
Road Name: West Riverdell Drive
Quad Name / ITM: Anchorage C-7
AWC Stream #: 247-50-10300
Stream Name: Cottonwood Creek
Site Comments: None
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Project Supervisor: Kim Clark, ADFG
— Anchorage, AK
Observers: Kim Clark, Michael Mazzacavallo
Overall Fish Passage Rating:
Step Pools: No
Construction Year: 2016
Comments: Channel splits into multiple stable channels below the outlet. Steam pipe on right bank is broken. Overflow pipe on river left.
|ID: 1||Structure Type: Box culvert (Structural steel plate)||Fish Passage Rating:|
Comments: Overflow pipe is present. No water flowing through at time of site visit. Pipe graident in designs 0.90%, Water surface gradient 0.50%, Invert gradient 1.3%.
|Stream Width Type||Distance From
|Upstream ordinary high water||86.0||26.90|
|Upstream ordinary high water||108.0||17.24|
|Upstream ordinary high water||127.0||16.84|
|Road Elev (Road surface)||102.86|
|D/S Thalweg (top of where channel starts braiding)||0.00||94.17|
|D/S Water Surface Elev||0.00||94.80|
|D/S Thalweg (bottom of rock weir)||15.50||94.18|
|D/S Water Surface Elev||15.50||95.02|
|Outlet Culvert Top||24.30||100.39|
|D/S Water Surface Elev||24.30||95.41|
|D/S Thalweg (top of rock weir)||25.00||94.34|
|D/S Water Surface Elev||25.00||95.37|
|Inlet Culvert Top||99.70||100.65|
|Inlet Culvert Invert||99.70||95.15|
|U/S Water Surface Elev||99.70||95.74|
|U/S Water Surface Elev||102.70||95.95|
|U/S Water Surface Elev||129.70||95.11|
- River distance is measured continuously throughout the survey reach along the thalweg of the stream.
- Measured from each end of the crossing along the thalweg of the stream.
Fish Sampling Efforts
No fish sampling occurred during this survey.
No fish observations occurred during this survey.
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