Fish Passage Site 20501246

Coordinates (dec. deg.): 61.76441°, -149.58159°
Legal Description: S019N002W02
Region: South Central
Road Name: Willow Fishhook Road- side roa

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-WFR08

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. Constriction ratio red
  3. Road bank erosion
  4. Shallow fill; inadequate roadfill volume above culvert
  5. Outfall height gray

Comments: Inlet rusted all around; further down pipe, rust to 0.7'; site has washed out, pipe exposed for much of its length. **Updated site photos added from 9/20/16 site visit from Sampling Unmapped Streams in the MSB project. Fish sampling information entered into AFFI. Road has been repaired, it does not appear that the culvert was replaced, but it does look like a small extention has been added to the outlet . Cuvlert now has a small outfall.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Red
 
Length(ft): 27.5
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 2.67
Condition Rating(1-5): 2
Approach Angle: 13.0
Sedimentation At Inlet: Yes
Inlet Substrate: None
Outlet Substrate: None
InletOutlet
Width(ft):2.0 2.0
Height(ft):1.9 2.0
Apron Length(ft):
Water Depth(ft): 0.43
Rustline Height(ft):0.7
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: 0.32
Culvert Gradient: 2.58%
Max Slope:
Max Slope Length:
 

Comments: Outfall height gray added from 9/20/16 site visit, see added photos.
  Culvert Observations:
  1. Culvert gradient red
  2. Constriction ratio red
  3. Road bank erosion
  4. Shallow fill; inadequate roadfill volume above culvert
  5. Outfall height gray

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:GravelGravel
Subdominant:GravelSilt/Clay
Stream Slope(deg.):
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Upstream ordinary high water 70.0 5.00
Upstream ordinary high water 100.0 6.50
Upstream ordinary high water 130.0 7.00

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Outlet Pool Water Elev 1 97.73
U/S Headwater 1 98.20
D/S Grade Ctrl (Thalweg) 1 0.00 35.0 97.25
D/S Water Surface Elev (@GP) 1 0.00 35.0 97.57
D/S Tailcrest or 1st Thalweg 1 21.00 14.0 97.52
D/S Water Surface Elev (@TWC) 1 21.00 14.0 97.73
D/S Thalweg (bottom of out pool) 1 31.50 3.5 96.82
Outlet Invert 1 35.00 0.0 97.30
Road Elev 1 48.50 99.71
Inlet Culvert Invert 1 62.50 0.0 98.01
U/S Thalweg (pool immed. u/s) 1 62.50 0.0 97.47

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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