Fish Passage Site 20601542

Coordinates (dec. deg.): 61.07329°, -151.25336°
Legal Description: S011N011W05
Region: South Central
Road Name: Tyonek-Beluga Road

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


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-1542

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

Overall Fish Passage Rating: Green

Tidal: No
Backwatered: No

Step Pools: No
Construction Year: 2015

Site Observations:

  1. Culvert gradient gray

Comments: Post replacement survey.

Culvert Measurements

ID: 1 Structure Type: Pipe-arch (Structural steel plate) Fish Passage Rating: Green
Length(ft): 80.4
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 2.5
Corrugation Width(in.): 6.0
Condition Rating(1-5): 5
Approach Angle: 30.0
Sedimentation At Inlet:
Inlet Substrate: Cobble
Outlet Substrate: Cobble
Width(ft):16.5 16.1
Height(ft): 9.9
Apron Length(ft):
Water Depth(ft): 1.13
Rustline Height(ft):
Substrate Depth(ft): 1.3
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 1.07
Culvert Gradient: 1.77%
Max Slope:
Max Slope Length:

Comments: Culvert set a little too high, culvert does not meet embedded standards for a pipe arch. Water surface gradient though culvert 1.49%, substrate gradient from inverts 1.46%.

  Culvert Observations:
  1. None of this type

Stream Measurements

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

No stream width data available.


Locator ID Culvert
Distance (ft)1
Distance From
Crossing (ft)2
Elevation (ft)
Road Elev 105.05
D/S Thalweg 0.00 87.60
D/S Water Surface Elev 0.00 88.15
D/S Grade Ctrl (Thalweg) (End of constructed outlet reach) 105.00 88.21
D/S Water Surface Elev 105.00 89.30
Max Pool Depth (Middle of constructed reach.) 134.00 86.41
Outlet Pool Water Elev 134.00 89.38
Outlet Invert (On substrate) 157.00 88.45
D/S Water Surface Elev 157.00 89.58
Outlet Culvert Top 157.00 98.60
Inlet Culvert Top 237.40 100.02
Inlet Culvert Invert (On substrate) 237.40 89.62
U/S Water Surface Elev 237.40 90.78
U/S Grade Ctrl (Thalweg) (1st resting habitat) 246.40 89.48
U/S Water Surface Elev 246.40 90.82


  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): 1.1
Comments: No fish caught
Gear Type: Minnow Trap (B) Trap Duration(h): 1.1
Comments: No fish caught.

Fish Observations

No fish observations occurred during this survey.

Questions or comments about this report can be directed to