Fish Passage Site 20501248

Coordinates (dec. deg.): 61.76528°, -149.55530°
Legal Description: S019N002W01
Region: South Central
Road Name: Willow Fishhook Road

Datum: WGS84
Quad Name / ITM: Anchorage D-7
AWC Stream #:
Stream Name: Willow Creek tributary

Elevation:

Site Comments: None

Survey Date: Sep 08, 2009

Survey MSB09-WFR10

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. Culvert is poorly aligned

Comments: Upstream too shallow for trapping and downstream connects to AWC stream. **Updated site photos added from 9/20/16 site visit from Sampling Unmapped Streams in the MSB project. Fish information entered into AFFI.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Red
 
Length(ft): 40.7
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 2.67
Condition Rating(1-5): 3
Approach Angle: 72.0
Sedimentation At Inlet: No
Inlet Substrate: None
Outlet Substrate: None
InletOutlet
Width(ft):3.0 3.0
Height(ft):2.9 3.0
Apron Length(ft):
Water Depth(ft): 0.07
Rustline Height(ft):0.4
Substrate Depth(ft):0.0 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 2.13
Outfall Type: Cascade Over Rip-Rap
Constriction Ratio: 0.86
Culvert Gradient: 8.35%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Culvert gradient red
  2. Outfall height red
  3. Culvert is poorly aligned

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:SandGravel
Subdominant:CobbleSilt/Clay
Stream Slope(deg.):
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Upstream ordinary high water 20.0 4.00
Upstream ordinary high water 50.0 4.50
Upstream ordinary high water 80.0 2.00

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Outlet Pool Water Elev (WS of outlet pool) 1 91.60
U/S Headwater 1 97.14
D/S Grade Ctrl (Thalweg) 1 0.00 15.0 87.69
D/S Water Surface Elev (@GP) 1 0.00 15.0 87.81
D/S Grade Ctrl (Thalweg) (pt would be TWC, but water flows thru rocks under it) 1 9.50 5.5 91.69
D/S Thalweg (bottom of pool) 1 10.50 4.5 90.92
U/S Water Surface Elev (@GP) 1 14.30 0.7 97.27
Outlet Invert 1 15.00 0.0 93.66
Road Elev 1 35.00 101.14
Inlet Culvert Invert 1 55.70 0.0 97.06
U/S Grade Ctrl (Thalweg) (1st TC u/s) 1 56.40 0.7 97.12

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

No fish sampling occurred during this survey.

Fish Observations

No fish observations occurred during this survey.

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