Fish Passage Site 20501238

Coordinates (dec. deg.): 61.75817°, -150.10738°
Legal Description: S019N005W12
Region: South Central
Road Name: Willow Creek Parkway

Datum: WGS84
Quad Name / ITM: Tyonek D-1
AWC Stream #: 247-41-10200-2120-3010
Stream Name: Shirley Lake outlet


Site Comments: Creek drains Shirley Lake into Willow Creek

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.


Project Supervisor: Gillian O'Doherty, ADFG
Observers: Mark Eisenman, Robert Pype

Overall Fish Passage Rating: Green

Tidal: No
Backwatered: Maybe

Step Pools: No
Construction Year: 2015

Site Observations:

  1. None of this type

Comments: Replaced in 2015 with a fish friendly culvert. Culvert resurveyed April 21st, 2016. Lots of fines in culvert, Lots of settling in barrel and downstream. Old beaver dam downstream. Water Ferric. No fish caught, but juveniles observed downstream near old beaver dam.

Culvert Measurements

ID: 1 Structure Type: Box culvert (Structural aluminum plate) Fish Passage Rating: Green
Length(ft): 78.3
Inlet Type: Headwall
Outlet Type: Headwall
Corrugation Depth(in.): 4.0
Corrugation Width(in.): 9.0
Condition Rating(1-5): 5
Approach Angle: 30.0
Sedimentation At Inlet: No
Inlet Substrate: Silt/Clay
Outlet Substrate: Silt/Clay
Width(ft):13.02 13.65
Height(ft):7.2 8.98
Apron Length(ft):
Water Depth(ft): 1.73
Rustline Height(ft):
Substrate Depth(ft):
Backwatered?: Maybe
Baffles Present: No
Embedded?: Yes
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 1.26
Culvert Gradient: 1.07%
Max Slope:
Max Slope Length:

Comments: Culvert set within 1% of stream gradient. Inlet and outlet water surfaces very close.

  Culvert Observations:
  1. None of this type

Stream Measurements

Stream SubstratesUpstreamDownstream
Stream Slope(deg.):0.67
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)
Width (ft)
Upstream ordinary high water 50.0 15.40
Upstream ordinary high water 100.0 10.60
Upstream ordinary high water 150.0 10.70
Upstream ordinary high water 250.0 4.50


Locator ID Culvert
Distance (ft)1
Distance From
Crossing (ft)2
Elevation (ft)
Road Elev 107.76
Outlet Culvert Top (These measurements are not connected to the benchmark and were used to establish pipe gradient.) 4.04
Inlet Culvert Top 4.88
D/S Thalweg (Head of gravel bar) 0.00 89.00
D/S Water Surface Elev 0.00 89.82
D/S Tailcrest or 1st Thalweg 41.00 89.33
D/S Water Surface Elev 41.00 90.23
D/S Thalweg (Middle of outlet glide) 91.00 88.52
D/S Water Surface Elev 91.00 90.34
Outlet Invert (On substrate) 141.00 88.73
D/S Water Surface Elev 141.00 90.46
Inlet Culvert Invert (On substrate, 1st resting) 219.30 88.91
U/S Water Surface Elev 219.30 90.48
U/S Thalweg (Middle of constructed inlet riffle) 233.30 89.62
U/S Water Surface Elev 233.30 90.44
U/S Grade Ctrl (Thalweg) (End of constructed inlet riffle) 299.30 89.92
U/S Water Surface Elev 299.30 90.66
U/S Grade Ctrl (Thalweg) 351.30 90.66
U/S Water Surface Elev (Stream gradient start) 351.30 90.96
U/S Grade Ctrl (Thalweg) 443.30 90.75
U/S Water Surface Elev (Stream gradient end) 443.30 91.37


  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): 1.9
Comments: Trap set about 60 feet upstream of culvert.

Fish Observations

No fish observations occurred during this survey.

Questions or comments about this report can be directed to