Fish Passage Site 20501190

Coordinates (dec. deg.): 61.77271°, -149.98705°
Legal Description: S019N004W03
Region: South Central
Road Name: Kenny Boulevard

Datum: WGS84
Quad Name / ITM: Anchorage D-8
AWC Stream #:
Stream Name: Willow Creek tributary

Elevation:

Site Comments: Slough of Willow Ck

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-KNB01

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

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools:
Construction Year:


Site Observations:

  1. Constriction ratio red
  2. Hydraulic flows exceeded capacity
  3. Culvert gradient red

Comments: Plastic pipe - no corrugations inside pipe; coho juv caught u/s and d/s.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated plastic) Fish Passage Rating: Red
 
Length(ft): 28.8
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.):
Corrugation Width(in.):
Condition Rating(1-5): 4
Approach Angle: 28.0
Sedimentation At Inlet: Yes
Inlet Substrate: None
Outlet Substrate: None
InletOutlet
Width(ft):1.25 1.25
Height(ft):1.25 1.25
Apron Length(ft):
Water Depth(ft): 0.43
Rustline Height(ft):
Substrate Depth(ft):0.0 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 0.11
Culvert Gradient: 1.91%
Max Slope:
Max Slope Length:
 

Comments: No corregations in culvert, only on outside.
  Culvert Observations:
  1. Constriction ratio red
  2. Hydraulic flows exceeded capacity
  3. Culvert gradient red

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:Silt/ClaySand
Subdominant:GravelGravel
Stream Slope(deg.):
Stream Flow Stage:
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Upstream ordinary high water 58.0 12.00
Upstream ordinary high water 150.0 9.00
Upstream ordinary high water 185.0 12.00

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Outlet Pool Water Elev 1 99.05
U/S Headwater 1 99.62
D/S Grade Ctrl (Thalweg) 1 0.00 18.0 98.50
D/S Water Surface Elev (@GP) 1 0.00 18.0 98.94
D/S Tailcrest or 1st Thalweg 1 12.80 5.2 98.74
D/S Water Surface Elev (@TWC) 1 12.80 5.2 99.04
D/S Thalweg 1 16.00 2.0 98.43
D/S Thalweg (stream bed @ end of pipe) 1 18.00 0.0 98.38
Outlet Invert 1 18.00 0.0 98.62
Road Elev 1 32.00 101.79
Inlet Culvert Invert 1 46.80 0.0 99.17
U/S Water Surface Elev (@GP) 1 49.80 3.0 99.65
U/S Grade Ctrl (Thalweg) 1 49.80 3.0 99.01

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: Minnow Trap (A) Trap Duration(h): 1.0
Comments: 40ft d/s; next to log
 
Gear Type: Minnow Trap (B) Trap Duration(h): 1.0
Comments: 90ft u/s; next to log

Fish Observations

Species: juvenile coho salmon Life History: Anadromous (Suspected Spawning)
Total Fish Observed: 6 Fish Measured: 6 Fork Lengths (mm) Min: 35 Max: 90 Mean: 69
Collected/Observed by Gear Type: Upstream Minnow Trap (2)  Downstream Minnow Trap (4)  

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