Fish Passage Site 20501242

Coordinates (dec. deg.): 61.76444°, -149.59810°
Legal Description: S019N002W02
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

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-WFR04

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

Overall Fish Passage Rating: Green

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:


Site Observations:

  1. Shallow fill; inadequate roadfill volume above culvert

Comments: D/s chan has 2 drops between boulders that may be natural barriers.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Green
 
Length(ft): 29.6
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 2.67
Condition Rating(1-5): 2
Approach Angle: 32.0
Sedimentation At Inlet: Yes
Inlet Substrate: None
Outlet Substrate: None
InletOutlet
Width(ft):3.0 3.0
Height(ft):2.7 3.0
Apron Length(ft):
Water Depth(ft): 0.09
Rustline Height(ft):0.9
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: 1.0
Culvert Gradient: 0.34%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Shallow fill; inadequate roadfill volume above culvert

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:Silt/ClayGravel
Subdominant:Silt/ClaySilt/Clay
Stream Slope(deg.):
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Upstream ordinary high water 51.0 3.50
Upstream ordinary high water 96.0 3.00
Upstream ordinary high water 120.0 2.50

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
D/S Grade Ctrl (Thalweg) 1 0.00 16.0 96.05
D/S Water Surface Elev (@GP) 1 0.00 16.0 97.11
D/S Tailcrest or 1st Thalweg 1 13.00 3.0 97.12
D/S Water Surface Elev (@TWC) 1 13.00 3.0 97.16
D/S Thalweg (bottom of pool) 1 14.50 1.5 96.91
Outlet Invert 1 16.00 0.0 97.07
Outlet Pool Water Elev 1 16.00 0.0 97.16
Road Elev 1 30.50 100.31
Inlet Culvert Invert 1 45.60 0.0 97.17
U/S Headwater (pool immed. u/s of inlet) 1 45.60 0.0 97.27

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: no fish caught; 100ft u/s
 
Gear Type: Minnow Trap (B) Trap Duration(h): 1.0
Comments: no fish caught; 15ft d/s

Fish Observations

No fish observations occurred during this survey.

Questions or comments about this report can be directed to dfg.dsf.webmaster@alaska.gov