Fish Passage Site 20401283

Coordinates (dec. deg.): 61.52637°, -149.51404°
Legal Description: S017N001W31
Region: South Central
Road Name: Driveway off Trapline Drive

Datum: NAD83
Quad Name / ITM: Anchorage C-7
AWC Stream #: 247-50-10300-2012
Stream Name: Cottonwood Slough

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-CT132

Observers: Doug Hill, Joe Conner, Sharie Chrisco

Overall Fish Passage Rating: Gray

Tidal: No
Backwatered: No

Step Pools:
Construction Year:


Comments: Trees too thick for 50' elevation.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated Metal) Fish Passage Rating: Gray
 
Length(ft): 42.0
Inlet Type: Projecting
Outlet Type:
Corrugation Depth(in.): 1.0
Corrugation Width(in.): 3.0
Condition Rating(1-5):
Approach Angle:
Sedimentation At Inlet:
Inlet Substrate: Silt/Clay
Outlet Substrate: Silt/Clay
InletOutlet
Width(ft):2.5 2.5
Height(ft):2.0 1.4
Apron Length(ft):
Water Depth(ft):1.3 0.8
Rustline Height(ft):
Substrate Depth(ft):0.5 1.1
Backwatered?:
Baffles Present: No
Embedded?: No
Outfall Height:
Outfall Type:
Constriction Ratio: 0.28
Culvert Gradient:
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. None of this type

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:Silt/ClaySilt/Clay
Subdominant:
Stream Slope(deg.):
Stream Flow Stage:
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Downstream ordinary high water 25.0 9.20
Downstream ordinary high water 40.0 9.70
Upstream ordinary high water 7.5 10.40
Upstream ordinary high water 50.0 9.00

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
U/S Thalweg 90.40
Inlet Culvert Top 1 90.88
Outlet Culvert Top 1 92.20
D/S Thalweg 0.00 40.0 90.00
D/S Thalweg 31.50 8.5 90.00
Outlet Invert 1 40.00 0.0 90.90
Outlet Thalweg 1 40.00 0.0 90.90
Road Elev 61.00 95.95
Road Elev 61.00 96.11
Inlet Culvert Invert 1 82.00 0.0 90.45
Inlet Thalweg 1 82.00 0.0 90.45
U/S Thalweg 83.80 1.8 90.70
U/S Thalweg 89.50 7.5 89.92

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.

Photos

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