Fish Passage Site 20401284

Coordinates (dec. deg.): 61.52598°, -149.51505°
Legal Description: S017N001W31
Region: South Central
Road Name: driveway - 2540 Trapline Drive

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

Elevation:

Site Comments: Driveway on Trapline for 2540.

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-CT133

Observers: Doug Hill, Joe Conner, Sharie Chrisco

Overall Fish Passage Rating: Gray

Tidal: No
Backwatered: No

Step Pools:
Construction Year:


Comments: CR calc'd based on ditch width since channel is 100% modified in this area.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated Metal) Fish Passage Rating: Gray
 
Length(ft): 40.0
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 2.0
Apron Length(ft):
Water Depth(ft):0.7 0.4
Rustline Height(ft):
Substrate Depth(ft):0.5 0.5
Backwatered?:
Baffles Present: No
Embedded?: No
Outfall Height:
Outfall Type:
Constriction Ratio:
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 45.0 6.40
Upstream ordinary high water 50.0 8.50

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Outlet Culvert Top 1 93.35
Inlet Culvert Top 1 93.56
U/S Thalweg 91.57
D/S Water Surface Elev 0.00 45.0 90.85
D/S Thalweg 14.00 31.0 90.72
Outlet Invert 1 45.00 0.0 91.27
Road Elev 65.00 95.94
Road Elev 65.00 96.03
Inlet Culvert Invert 1 85.00 0.0 91.83
Inlet Thalweg 1 85.00 0.0 91.83
U/S Thalweg 100.00 15.0 91.22

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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