Fish Passage Site 20401305

Coordinates (dec. deg.): 61.57048°, -149.42180°
Legal Description: S017N001W15
Region: South Central
Road Name: East Glenwood Avenue

Datum: NAD83
Quad Name / ITM: Anchorage C-7
AWC Stream #: 247-50-10300
Stream Name: Cottonwood Creek

Elevation:

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 MSCS1-CT156

Observers: Edward Weiss, Joe Conner, Jared Edgar

Overall Fish Passage Rating: Green

Tidal: No
Backwatered: No

Step Pools:
Construction Year:


Comments: Road fill-fine & sand; eroding sheet pile headwalls-leaning in;

Culvert Measurements

ID: 1 Structure Type: Open-bottom arch (Strutural Metal Plate) Fish Passage Rating: Green
 
Length(ft): 63.3
Inlet Type: Headwall
Outlet Type:
Corrugation Depth(in.): 1.0
Corrugation Width(in.): 3.0
Condition Rating(1-5):
Approach Angle:
Sedimentation At Inlet:
Inlet Substrate: Gravel
Outlet Substrate: Gravel
InletOutlet
Width(ft):9.5 9.5
Height(ft):5.0 5.0
Apron Length(ft):
Water Depth(ft):0.9 0.7
Rustline Height(ft):
Substrate Depth(ft):
Backwatered?:
Baffles Present: No
Embedded?: No
Outfall Height:
Outfall Type:
Constriction Ratio:
Culvert Gradient: 1.01%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Sediment accumulation

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:GravelGravel
Subdominant:
Stream Slope(deg.):
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Downstream ordinary high water 50.0 51.00
Downstream ordinary high water 100.0 56.00

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Outlet Culvert Top 1 90.68
Inlet Culvert Top 1 91.16
D/S Thalweg 84.43
D/S Thalweg 0.00 100.0 84.56
Outlet Invert 1 100.00 0.0 85.25
Outlet Thalweg 1 100.00 0.0 85.25
Road Elev 131.50 94.22
Road Elev 131.50 94.25
Inlet Culvert Invert 1 163.00 0.0 85.89
Inlet Thalweg 1 163.00 0.0 85.89
U/S Thalweg 189.20 26.2 84.81

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

Gear Type: Visual Observation, Ground (C)

Fish Observations

Species: adult coho salmon Life History: Anadromous (Suspected Spawning)
Total Fish Observed: Fish Measured: Fork Lengths (mm) Min: Max: Mean:
Collected/Observed by Gear Type: Upstream Visual Observation, Ground ()  
Comments: Adult coho observed upstream and downstream of culvert

Photos

Questions or comments about this report can be directed to dfg.dsf.webmaster@alaska.gov