Fish Passage Site 20601532

Coordinates (dec. deg.): 61.11343°, -151.14975°
Legal Description: S012N011W24
Region: South Central
Road Name: Logging Road

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


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-1532

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

Overall Fish Passage Rating: Green

Tidal: No
Backwatered: Yes

Step Pools: No
Construction Year:

Site Observations:

  1. Culvert gradient red
  2. Beaver Activity

Comments: Cataloged anadromy currently ends at crossing. Site is currently backwatered by a beaver dam downstream and is most likely not a barrier at current flows. Culvert has been replaced since 2002 survey.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Green
Length(ft): 37.8
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 1.0
Corrugation Width(in.): 2.5
Condition Rating(1-5): 3
Approach Angle: 0.0
Sedimentation At Inlet: Yes
Inlet Substrate: None
Outlet Substrate: Gravel
Width(ft):5.4 5.2
Height(ft):4.6 4.0
Apron Length(ft):
Water Depth(ft): 1.76
Rustline Height(ft):3.7
Substrate Depth(ft):0.0 1.2
Backwatered?: Yes
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 0.95
Culvert Gradient: 1.90%
Max Slope:
Max Slope Length:

Comments: Fish observed downstream from culvert

  Culvert Observations:
  1. Culvert gradient red
  2. Beaver Activity

Stream Measurements

Stream SubstratesUpstreamDownstream
Stream Slope(deg.):
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)
Width (ft)
Downstream ordinary high water 50.0 4.70
Downstream ordinary high water 100.0 6.40
Downstream ordinary high water 150.0 6.00


Locator ID Culvert
Distance (ft)1
Distance From
Crossing (ft)2
Elevation (ft)
Road Elev 101.74
D/S Thalweg 0.00 95.04
D/S Water Surface Elev 0.00 96.01
D/S Thalweg (Below beaver dam) 42.00 95.80
D/S Water Surface Elev 42.00 96.49
D/S Thalweg (Top of Beaver dam) 47.00 97.23
Max Pool Depth 66.00 95.98
Outlet Pool Water Elev 66.00 97.53
Outlet Invert (On substrate) 70.00 95.76
D/S Water Surface Elev 70.00 97.52
Outlet Culvert Top 70.00 99.98
Inlet Culvert Top 107.80 100.70
Inlet Culvert Invert (On pipe, 1st resting, pond upstream) 107.80 96.16
U/S Water Surface Elev 107.80 97.55


  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): 12.0

Fish Observations

Species: adult threespine stickleback Life History: Unknown
Total Fish Observed: 4 Fish Measured: Fork Lengths (mm) Min: Max: Mean:
Collected/Observed by Gear Type: Downstream Minnow Trap (4)  

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