Fish Passage Site 20401273

Coordinates (dec. deg.): 61.62455°, -149.31351°
Legal Description: S018N001E29
Region: South Central
Road Name: Driveway

Datum: NAD83
Quad Name / ITM: Anchorage C-7
AWC Stream #: 247-50-10300-2080
Stream Name: Cottonwood Creek tributary

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-CT116

Observers: Edward Weiss, Doug Hill, Joe Conner

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools:
Construction Year:


Site Observations:

  1. Culvert gradient red

Comments: None

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated Metal) Fish Passage Rating: Red
 
Length(ft): 31.0
Inlet Type: Projecting
Outlet Type:
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 2.67
Condition Rating(1-5):
Approach Angle:
Sedimentation At Inlet:
Inlet Substrate: Sand
Outlet Substrate: Sand
InletOutlet
Width(ft):1.9 2.0
Height(ft):1.4 1.7
Apron Length(ft):
Water Depth(ft):0.2 0.5
Rustline Height(ft):
Substrate Depth(ft):0.6 0.3
Backwatered?:
Baffles Present: No
Embedded?: No
Outfall Height:
Outfall Type:
Constriction Ratio:
Culvert Gradient: 1.97%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. None of this type

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:SandSand
Subdominant:
Stream Slope(deg.):
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Downstream ordinary high water 42.0 6.30
Downstream ordinary high water 100.0 5.60
Upstream ordinary high water 50.0 6.40
Upstream ordinary high water 104.0 7.40

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Outlet Culvert Top 1 93.01
Inlet Culvert Top (1) 1 93.39
D/S Thalweg 0.00 100.0 90.08
D/S Thalweg 58.00 42.0 90.30
Outlet Invert 1 100.00 0.0 91.39
Outlet Thalweg 1 100.00 0.0 91.39
Road Elev 115.50 95.78
Road Elev 115.50 95.96
Inlet Culvert Invert 1 131.00 0.0 92.00
Inlet Thalweg 1 131.00 0.0 92.00
U/S Thalweg 181.00 50.0 91.82
U/S Thalweg 235.00 104.0 91.98

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: Minnow Trap (A) Trap Duration(h): 1
 
Gear Type: Minnow Trap (B) Trap Duration(h): 1

Fish Observations

Species: juvenile/adult Dolly Varden Life History: Unknown
Total Fish Observed: 6 Fish Measured: 3 Fork Lengths (mm) Min: 85 Max: 92 Mean: 88
Collected/Observed by Gear Type: Downstream Minnow Trap (2)  Upstream Minnow Trap (4)  
 
Species: juvenile coho salmon Life History: Anadromous
Total Fish Observed: 22 Fish Measured: 11 Fork Lengths (mm) Min: 46 Max: 79 Mean: 61
Collected/Observed by Gear Type: Downstream Minnow Trap (16)  Upstream Minnow Trap (6)  

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