Fish Passage Site 20501240

Coordinates (dec. deg.): 61.76908°, -149.71284°
Legal Description: S019N002W06
Region: South Central
Road Name: Willow Fishhook Road

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

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-WFR02

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

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:


Site Observations:

  1. Culvert gradient red
  2. Outfall height red
  3. Shallow fill; inadequate roadfill volume above culvert
  4. Compound gradient in pipe

Comments: Pipe sags in middle (upper part of pipe is steeper than 3.13% grade)

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Red
 
Length(ft): 40.2
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 2.67
Condition Rating(1-5): 2
Approach Angle: 50.0
Sedimentation At Inlet: No
Inlet Substrate: None
Outlet Substrate: None
InletOutlet
Width(ft):3.7 3.9
Height(ft):4.1 4.0
Apron Length(ft):
Water Depth(ft): 0.19
Rustline Height(ft):1.5
Substrate Depth(ft):0.0 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.5
Outfall Type: Free Fall In To Pool
Constriction Ratio: 0.82
Culvert Gradient: 3.13%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Culvert gradient red
  2. Outfall height red
  3. Shallow fill; inadequate roadfill volume above culvert
  4. Compound gradient in pipe

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:Silt/ClayGravel
Subdominant:CobbleSand
Stream Slope(deg.):
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Upstream ordinary high water 53.0 5.00
Upstream ordinary high water 74.0 4.50
Upstream ordinary high water 125.0 4.00

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Outlet Pool Water Elev 1 94.37
U/S Headwater (pool immed. u/s of inlet) 1 96.19
D/S Grade Ctrl (Thalweg) 1 0.00 24.0 93.45
D/S Water Surface Elev (@GP) 1 0.00 24.0 93.70
D/S Tailcrest or 1st Thalweg 1 14.00 10.0 94.22
D/S Water Surface Elev (@TWC) 1 14.00 10.0 94.37
D/S Thalweg (bottom of pool) 1 20.50 3.5 93.33
D/S Thalweg 1 24.00 0.0 94.20
Outlet Invert 1 24.00 0.0 94.68
Road Elev 1 44.00 100.32
U/S Thalweg 1 64.20 0.0 95.55
Inlet Culvert Invert 1 64.20 0.0 95.94

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): 0.75
Comments: no fish caught; 75ft u/s
 
Gear Type: Minnow Trap (B) Trap Duration(h): 0.75
Comments: no fish caught; 60ft u/s

Fish Observations

No fish observations occurred during this survey.

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