Fish Passage Site 20601543

Coordinates (dec. deg.): 61.05783°, -151.40369°
Legal Description: S011N012W09
Region: South Central
Road Name: Tyonek Timber Road

Datum: NAD83
Quad Name / ITM: Tyonek A-4
AWC Stream #:
Stream Name: Bird Lake outlet


Site Comments: Bird Lake upstream of crossing.

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-1543

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

Overall Fish Passage Rating: Red


Step Pools:
Construction Year:

Site Observations:

  1. Constriction ratio red
  2. Outfall height red

Comments: Culvert has blown out multiple times. Road fill observed over 600 feet downstream. This culvert has been here at least 5 years. Large fish observed downstream likely rainbow trout spawning. Downstream flattens out and becomes a marsh. Ponded upstream.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Non-corrugated metal) Fish Passage Rating: Red
Length(ft): 33.3
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.):
Corrugation Width(in.):
Condition Rating(1-5): 2
Approach Angle: 0.0
Sedimentation At Inlet: Yes
Inlet Substrate: None
Outlet Substrate: None
Width(ft):2.9 2.9
Height(ft):2.11 2.11
Apron Length(ft):
Water Depth(ft): 0.23
Rustline Height(ft):
Substrate Depth(ft):0.0 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.68
Outfall Type: Free Fall In To Pool
Constriction Ratio: 0.43
Culvert Gradient: -1.05%
Max Slope:
Max Slope Length:

Comments: Culvert set at adverse angle impounding water above culvert.

  Culvert Observations:
  1. Constriction ratio red
  2. Outfall height red

Stream Measurements

Stream SubstratesUpstreamDownstream
Stream Slope(deg.):
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)
Width (ft)
Downstream ordinary high water 150.0 7.50
Downstream ordinary high water 200.0 6.00


Locator ID Culvert
Distance (ft)1
Distance From
Crossing (ft)2
Elevation (ft)
Road Elev 101.00
D/S Thalweg 0.00 95.50
D/S Water Surface Elev (Pool) 0.00 96.12
D/S Tailcrest or 1st Thalweg 10.50 95.92
Max Pool Depth 23.20 94.08
Outlet Pool Water Elev 23.20 96.26
D/S Thalweg (Downstream gas pipe in stream) 23.20 95.38
Outlet Culvert Top 25.20 100.01
Outlet Invert (On pipe) 25.20 97.05
D/S Water Surface Elev 25.20 97.28
Inlet Culvert Invert (On pipe) 58.50 96.68
U/S Water Surface Elev 58.50 97.49
Inlet Culvert Top 58.50 99.66


  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
Gear Type: Minnow Trap (B) Trap Duration(h): 1.0
Gear Type: Visual Observation, Ground (C)

Fish Observations

Species: juvenile coho salmon Life History: Anadromous
Total Fish Observed: 1 Fish Measured: 1 Fork Lengths (mm) Min: 94 Max: 94 Mean: 94
Collected/Observed by Gear Type: Upstream Minnow Trap (1)  
Species: adult rainbow trout Life History: Unknown
Total Fish Observed: 3 Fish Measured: Fork Lengths (mm) Min: Max: Mean:
Collected/Observed by Gear Type: Downstream Visual Observation, Ground (3)  
Comments: Adults appeared to be spawning

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