Fish Passage Site 20400215

Coordinates (dec. deg.): 61.18513°, -149.77287°
Legal Description: S013N003W26
Region: South Central
Road Name: Reflection Drive

Datum: NAD83
Quad Name / ITM: Anchorage A-8
AWC Stream #: 247-50-10050-2040
Stream Name: Chester Creek South Fork

Elevation:

Site Comments: CHESTER CREEK WATERSHED

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-REF01

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

Overall Fish Passage Rating: Gray

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:


Site Observations:

  1. Culvert sagging in middle
  2. Constriction ratio red

Comments: Culvert length was measured across road with laser. Not enough room to shoot within pipe. Upstream of inlet there is a build up of debris behind 4x4 posts. Stickleback observed upstream. Stickleback and juvenile coho observed downstream. Garbage in stream at site.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Gray
 
Length(ft): 71.3
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 2.0
Condition Rating(1-5): 5
Approach Angle: 0.0
Sedimentation At Inlet: No
Inlet Substrate: Gravel
Outlet Substrate: Organic
InletOutlet
Width(ft):2.95 2.85
Height(ft):1.65 1.68
Apron Length(ft):
Water Depth(ft): 1.37
Rustline Height(ft):1.1
Substrate Depth(ft):1.3 1.17
Backwatered?: No
Baffles Present: No
Embedded?: Yes
Embedded Depth(ft): 1.17
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 0.4
Culvert Gradient: 0.72%
Max Slope:
Max Slope Length:
 

Comments: outlet height of Pipe#1 is with rod gently on top of silt and muck. If rod is pushed through silt and muck, height is 2.1.
  Culvert Observations:
  1. Culvert sagging in middle
  2. Constriction ratio red
ID: 2 Structure Type: Circular pipe (Corrugated plastic) Fish Passage Rating: Gray
 
Length(ft): 73.0
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 1.5
Corrugation Width(in.): 1.5
Condition Rating(1-5): 5
Approach Angle: 0.0
Sedimentation At Inlet: No
Inlet Substrate: Gravel
Outlet Substrate: Organic
InletOutlet
Width(ft):2.0 2.0
Height(ft):1.55 1.85
Apron Length(ft):
Water Depth(ft): 1.22
Rustline Height(ft):
Substrate Depth(ft):1.45 1.15
Backwatered?: No
Baffles Present: No
Embedded?: Yes
Embedded Depth(ft): 1.15
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 0.4
Culvert Gradient: 0.38%
Max Slope:
Max Slope Length:
 

Comments: substrate throughout the pipe.
  Culvert Observations:
  1. Constriction ratio red

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:GravelSand
Subdominant:SandOrganic
Stream Slope(deg.):
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Upstream ordinary high water 53.0 9.10
Upstream ordinary high water 61.0 7.30
Upstream ordinary high water 67.0 7.30

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Road Elev (Road Surface) 101.25
D/S Grade Ctrl (Thalweg) 0.00 98.45
D/S Water Surface Elev 0.00 99.39
D/S Water Surface Elev (Outlet water surface Pipe 2) 8.00 99.41
D/S Water Surface Elev (Outlet water surface Pipe 1) 8.00 99.41
Outlet Invert (Outlet invert Pipe 1) 8.00 98.04
Outlet Invert (Pipe 2 outlet invert) 8.00 98.19
Outlet Culvert Top (Top of Pipe 1) 8.00 100.00
Outlet Culvert Top (Top of Pipe 2) 8.00 100.25
U/S Water Surface Elev (Inlet water surface Pipe 1) 79.30 99.47
Inlet Culvert Invert (Inlet invert Pipe 1) 79.30 98.84
Inlet Culvert Top (Top of Pipe 1) 79.30 100.51
Inlet Culvert Top (Top of Pipe 2) 81.01 98.86
Inlet Culvert Invert (Inlet invert Pipe 2) 81.01 98.86
U/S Water Surface Elev (Inlet water surface Pipe 2) 81.01 99.44
U/S Thalweg 101.01 99.71
U/S Water Surface Elev 101.01 100.13
U/S Thalweg 145.01 100.27
U/S Water Surface Elev 145.01 100.74

Notes:

  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 dfg.dsf.webmaster@alaska.gov