Fish Passage Site 20601538

Coordinates (dec. deg.): 61.08064°, -151.17912°
Legal Description: S012N011W35
Region: South Central
Road Name: Logging Road

Datum: NAD83
Quad Name / ITM: Tyonek A-4
AWC Stream #:
Stream Name: Unnamed


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 UPDATE-TY012

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

Overall Fish Passage Rating: Green


Step Pools:
Construction Year: 2012

Site Observations:

  1. None of this type

Comments: Replaced with a stream simulation design in October of 2012 and bioengineering work on the channel was completed in June of 2013.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Green
Length(ft): 60.1
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 1.3
Corrugation Width(in.): 3.0
Condition Rating(1-5): 5
Approach Angle: 0.0
Sedimentation At Inlet:
Inlet Substrate: Boulder
Outlet Substrate: Boulder
Width(ft):7.35 7.45
Height(ft):5.8 6.0
Apron Length(ft):
Water Depth(ft): 0.68
Rustline Height(ft):2.2
Substrate Depth(ft):1.6 1.5
Backwatered?: No
Baffles Present: No
Embedded?: Yes
Embedded Depth(ft): 1.5
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio:
Culvert Gradient: 1.65%
Max Slope:
Max Slope Length:

Comments: Downstream constructed channel shows signs of head cutting . Coir logs have been undercut and some look that they might fall into creekwith more erosion. Upstream water surface flat and held by large boulders at inlet. Looks like some of the substrate inside the culvert has been washed out.

  Culvert Observations:
  1. None of this type

Stream Measurements

Stream SubstratesUpstreamDownstream
Stream Slope(deg.):
Stream Flow Stage:

No stream width data available.


Locator ID Culvert
Distance (ft)1
Distance From
Crossing (ft)2
Elevation (ft)
Road Elev 103.37
D/S Grade Ctrl (Thalweg) (End of channel restoration) 0.00 92.57
D/S Water Surface Elev 0.00 93.15
D/S Tailcrest or 1st Thalweg 51.00 93.36
D/S Water Surface Elev 51.00 93.97
D/S Thalweg (In restored reach) 84.00 92.08
D/S Water Surface Elev 84.00 94.02
D/S Thalweg (In restored reach) 110.00 92.63
D/S Water Surface Elev 110.00 94.07
Outlet Invert (On substrate) 138.00 93.36
D/S Water Surface Elev 138.00 94.04
Outlet Culvert Top 138.00 99.73
Inlet Culvert Top 198.10 100.72
Inlet Culvert Invert (On substrate, 1st resting habitat) 198.10 94.47
U/S Water Surface Elev 198.10 96.27
U/S Thalweg (upstream in pond) 207.10 94.74
U/S Water Surface Elev 207.10 96.27


  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): 0.5
Comments: Trap set about 50 feet upstream. No fish caught
Gear Type: Minnow Trap (B) Trap Duration(h): 0.5
Comments: Trap set about 20 feet downstream. No fish caught.

Fish Observations

No fish observations occurred during this survey.

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