Fish Passage Site 20501520
Coordinates (dec. deg.): 61.99387°, -149.96294°
Legal Description: S022N004W14
Region: South Central
Road Name: South Silver Salmon Drive
Quad Name / ITM: Anchorage D-8
AWC Stream #: 247-41-10200-2190-3020
Stream Name: Caswell Creek tributary
Site Comments: None
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Project Supervisor: Gillian O'Doherty, ADFG
Observers: Mark Eisenman
Overall Fish Passage Rating:
Step Pools: No
Construction Year: 2017
Comments: Culverts replaced in 2017. Culvert reassessment 9/26/18. Lake directly upstream of culvert, stream bank bioengineering downstream from culvert. Old beaver dam complex downstream. 4' overflow culvert present on right hand side of main culvert.
|ID: 1||Structure Type: Box culvert (Structural aluminum plate)||Fish Passage Rating:|
Comments: Stream slope taken from 2011 replacement site plans, not verified, but cuvlert gradient close to 1%. Original replacment was washed out in 2012 flood.
|ID: 2||Structure Type: Circular pipe (Corrugated steel)||Fish Passage Rating:|
Comments: Over Flow pipe
No stream width data available.
|Outlet Invert (Overflow culvert)||2||95.86|
|Outlet Culvert Top (Overflow culvert)||2||99.80|
|Inlet Culvert Invert (Overflow culvert)||2||97.10|
|Inlet Culvert Top (Overflow culvert)||2||101.07|
|D/S Thalweg (End of outlet riffle)||0.00||92.82|
|D/S Water Surface Elev||0.00||93.44|
|D/S Thalweg (End of bioengineering)||48.00||93.95|
|D/S Water Surface Elev||48.00||94.34|
|D/S Thalweg (Constructed outlet riffle mid point)||66.00||94.23|
|D/S Water Surface Elev||66.00||94.86|
|D/S Water Surface Elev||76.00||95.16|
|Outlet Invert (On substrate)||1||91.00||94.78|
|D/S Water Surface Elev||1||91.00||95.40|
|Outlet Culvert Top (Taken 1 foot in on top of corrugation)||1||92.00||99.68|
|Inlet Culvert Top (Taken 1 foot in on top of corrugation)||1||144.30||100.41|
|Inlet Culvert Invert (On substrate)||1||145.30||95.64|
|U/S Water Surface Elev||1||145.30||96.37|
|U/S Grade Ctrl (Thalweg)||148.30||95.41|
|U/S Water Surface Elev||148.30||96.46|
|U/S Water Surface Elev||153.80||96.51|
|U/S Water Surface Elev||157.80||96.54|
|U/S Water Surface Elev||168.30||96.56|
|U/S Thalweg (Edge of lake/inlet channel)||175.30||93.64|
|U/S Water Surface Elev||175.30||96.54|
- 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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