Fish Passage Site 20400050

Coordinates (dec. deg.): 61.18899°, -149.82399°
Legal Description: S013N003W28
Region: South Central
Road Name: Providence Drive

Datum: NAD83
Quad Name / ITM: Anchorage A-8
AWC Stream #: 247-50-10050
Stream Name: Chester Creek South Fork



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-PRV01

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: 2 storm drains and confluences just below the outlet. Mid-channel gravel bar at inlet, thalweg splits.

Culvert Measurements

ID: 1 Structure Type: Open-bottom arch (Reinforced concrete) Fish Passage Rating: Green
Length(ft): 152.2
Inlet Type: Headwall
Outlet Type: Headwall
Corrugation Depth(in.):
Corrugation Width(in.):
Condition Rating(1-5): 5
Approach Angle: 0.0
Sedimentation At Inlet: No
Inlet Substrate: Gravel
Outlet Substrate: Cobble
Width(ft):19.85 19.6
Height(ft):4.04 4.91
Apron Length(ft):
Water Depth(ft): 1.31
Rustline Height(ft):
Substrate Depth(ft):
Backwatered?: No
Baffles Present: No
Embedded?: Yes
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 1.15
Culvert Gradient: 0.49%
Max Slope:
Max Slope Length:

Comments: Opened bottom arch. No corrugations.

Stream Measurements

Stream SubstratesUpstreamDownstream
Stream Slope(deg.):0.48
Stream Flow Stage:High
Stream Width Type Distance From
Crossing (ft)
Width (ft)
Downstream ordinary high water 156.4 14.94
Downstream ordinary high water 223.4 17.77
Downstream ordinary high water 230.4 18.43


Locator ID Culvert
Distance (ft)1
Distance From
Crossing (ft)2
Elevation (ft)
Road Elev (Road Surface) 99.90
D/S Thalweg 0.00 89.82
D/S Water Surface Elev 0.00 91.35
D/S Thalweg (bottom of riffle) 31.00 90.60
D/S Water Surface Elev 31.00 91.50
Outlet Invert 60.00 90.48
D/S Water Surface Elev 60.00 91.79
Outlet Culvert Top 60.00 95.27
Inlet Culvert Invert 205.20 91.47
U/S Water Surface Elev 205.20 92.25
Inlet Culvert Top 205.20 96.02
U/S Thalweg 231.20 92.05
U/S Water Surface Elev 231.20 92.64
U/S Thalweg 250.20 91.63
U/S Water Surface Elev 250.20 92.89
U/S Thalweg 265.20 92.59
U/S Water Surface Elev 265.20 93.15


  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