Fish Passage Site 20700877

Coordinates (dec. deg.): 57.76503°, -152.50283°
Legal Description: S028S020W10
Region: Southwest
Road Name: Tom Stiles Road

Datum: WGS84
Quad Name / ITM: Kodiak D-2
AWC Stream #:
Stream Name: Lake Catherine outlet


Site Comments: Site is on the stream that connect upstream Lake Catherine to Lake Loiuse downstream.

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 UPD21-TSR01

Project Supervisor: Kim Clark, ADFG — Anchorage, AK
Observers: Kim Clark, Michael Mazzacavallo

Overall Fish Passage Rating: Green

Tidal: No
Backwatered: No

Step Pools: No
Construction Year: 2019

Comments: 1 juvenile salmon observed in pipe near inlet. Revegetation looks good. Overflow pipe present. Dry tributary on left bank below outlet fed by storm drain across Pt Sherman Rd. Upstream stream gradient is 2.6% and downstream stream gradient is 0.57% per pre design surveys.

Culvert Measurements

ID: 1 Structure Type: Box culvert (Structural aluminum plate) Fish Passage Rating: Green
Length(ft): 95.0
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 2.5
Corrugation Width(in.): 9.5
Condition Rating(1-5): 5
Approach Angle: 12.0
Sedimentation At Inlet: No
Inlet Substrate: Gravel
Outlet Substrate: Gravel
Width(ft):18.2 18.1
Height(ft):5.1 4.95
Apron Length(ft):
Water Depth(ft): 0.79
Rustline Height(ft):
Substrate Depth(ft):1.1 1.16
Backwatered?: No
Baffles Present: No
Embedded?: Yes
Embedded Depth(ft): 1.1
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 1.32
Culvert Gradient: 0.89%
Max Slope:
Max Slope Length:

Comments: Culvert gradient measured as Top: 0.89%, Water surface 0.79%, Invert 0.44% Culvert dimensions per design are 19'5" x 6'11"

Stream Measurements

Stream SubstratesUpstreamDownstream
Stream Slope(deg.):1.18
Stream Flow Stage:Low
Stream Width Type Distance From
Crossing (ft)
Width (ft)
Upstream ordinary high water 66.0 12.65
Upstream ordinary high water 89.0 13.61
Upstream ordinary high water 110.0 13.80
Upstream ordinary high water 155.0 14.90


Locator ID Culvert
Distance (ft)1
Distance From
Crossing (ft)2
Elevation (ft)
D/S Thalweg (max pool depth) 0.00 92.79
D/S Water Surface Elev 0.00 93.93
D/S Thalweg (pool crest) 9.00 93.26
D/S Water Surface Elev 9.00 93.94
D/S Thalweg 21.00 93.43
D/S Water Surface Elev 21.00 94.03
D/S Thalweg 31.00 93.75
D/S Water Surface Elev 31.00 94.08
Outlet Culvert Top (on rib) 47.00 99.15
Outlet Invert 47.00 93.85
D/S Water Surface Elev 47.00 94.32
Inlet Culvert Top (on rib) 142.01 100.00
Inlet Culvert Invert 142.01 94.27
U/S Water Surface Elev 142.01 95.07
U/S Thalweg 155.01 94.35
U/S Water Surface Elev 155.01 95.12
U/S Thalweg 182.01 95.34
U/S Water Surface Elev 182.01 95.72
U/S Thalweg 244.01 96.41
U/S Water Surface Elev 244.01 96.93
U/S Thalweg 258.01 96.98
U/S Water Surface Elev 258.01 98.67


  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

No fish sampling occurred during this survey.

Fish Observations

No fish observations occurred during this survey.

Questions or comments about this report can be directed to