Fish Passage Site 20401231

Coordinates (dec. deg.): 61.52496°, -149.52979°
Legal Description: S017N001W31
Region: South Central
Road Name: Surrey Road

Datum: WGS84
Quad Name / ITM: Anchorage C-7
AWC Stream #:
Stream Name: Cottonwood Creek Trib

Elevation:

Site Comments: None

Multiple surveys have been conducted at this site — click on the drop down
arrow to the right of the survey date below to choose a different report for this site.

Survey MSB09-SUR03

Project Supervisor: Gillian O'Doherty, ADFG
Observers: Heidi Zimmer, Ben Histand

Overall Fish Passage Rating: Green

Tidal: No
Backwatered: No

Step Pools: Maybe
Construction Year: 2007


Site Observations:

  1. Shallow fill; inadequate roadfill volume above culvert

Comments: No channel widths because anas. channel.. Post-replacement survey of MS135 (USFWS id not ADFG); coho adults swimming upstream.

Culvert Measurements

ID: 1 Structure Type: Open-bottom arch (Structural steel plate) Fish Passage Rating: Green
 
Length(ft): 50.9
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 2.0
Corrugation Width(in.): 6.0
Condition Rating(1-5): 5
Approach Angle: 2.0
Sedimentation At Inlet: No
Inlet Substrate: Gravel
Outlet Substrate: Gravel
InletOutlet
Width(ft):13.3 13.7
Height(ft):5.2 5.5
Apron Length(ft):
Water Depth(ft): 0.44
Rustline Height(ft):0.6
Substrate Depth(ft):
Backwatered?: No
Baffles Present: No
Embedded?: Yes
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 1.12
Culvert Gradient:
Max Slope:
Max Slope Length:
 

Comments: Upstream stream grade = 1.11%. Uniform riffle in pipe;
  Culvert Observations:
  1. Shallow fill; inadequate roadfill volume above culvert
ID: 2 Structure Type: Open-bottom arch (Structural steel plate) Fish Passage Rating: Green
 
Length(ft): 51.0
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 2.0
Corrugation Width(in.): 6.0
Condition Rating(1-5): 5
Approach Angle: 6.0
Sedimentation At Inlet: No
Inlet Substrate: Gravel
Outlet Substrate: Gravel
InletOutlet
Width(ft):13.0 13.1
Height(ft):5.3 5.5
Apron Length(ft):
Water Depth(ft): 0.63
Rustline Height(ft):0.6
Substrate Depth(ft):
Backwatered?: No
Baffles Present: No
Embedded?: Yes
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 0.99
Culvert Gradient:
Max Slope:
Max Slope Length:
 

Comments: u/s grade = 1.95% Uniform riffle in pipe. pipe slope calc'd based on inverts
  Culvert Observations:
  1. Shallow fill; inadequate roadfill volume above culvert

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:GravelGravel
Subdominant:GravelGravel
Stream Slope(deg.):1.11
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Upstream ordinary high water
Upstream ordinary high water
Upstream ordinary high water
Upstream ordinary high water
Upstream ordinary high water
Upstream ordinary high water

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Road Elev 102.39
D/S Water Surface Elev (d/s in thalweg of main channel) 0.00 103.0 92.64
D/S Thalweg (d/s of pipe 2) 2 98.00 5.0 94.95
D/S Tailcrest or 1st Thalweg 1 101.00 2.0 95.37
D/S Water Surface Elev (ws @ TWC) 1 101.00 2.0 95.70
Outlet Pool Water Elev 2 103.00 95.71
Outlet Pool Water Elev 1 103.00 95.70
Outlet Invert 2 103.00 0.0 95.08
Outlet Invert 1 103.00 0.0 95.26
Inlet Culvert Invert (on subs) 1 153.90 0.0 96.42
U/S Headwater 1 153.90 96.70
U/S Headwater 2 154.00 96.60
Inlet Culvert Invert 2 154.00 0.0 96.22
U/S Grade Ctrl (Thalweg) (u/s of pipe 2) 2 226.00 72.0 98.26
U/S Water Surface Elev 2 226.00 72.0 98.66
U/S Water Surface Elev (ws @ gp) 1 257.90 104.0 98.73
U/S Grade Ctrl (Thalweg) (u/s of pipe 1) 1 257.90 104.0 98.09
U/S Water Surface Elev 2 268.00 114.0 99.13
U/S Grade Ctrl (Thalweg) (u/s of pipe 2) 2 268.00 114.0 98.50

Notes:

  1. River distance is measured continuously throughout the survey reach along the thalweg of the stream.
  2. Measured from each end of the crossing along the thalweg of the stream.

Fish Sampling Efforts

Gear Type: Visual Observation, Ground (A)
Comments: Visual observation of many adult Coho salmon swimming upstream from culvert.

Fish Observations

No fish observations occurred during this survey.

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