Fish Passage Site 20401300

Coordinates (dec. deg.): 61.52724°, -149.52698°
Legal Description: S017N001W31
Region: South Central
Road Name: Fairview Loop Road

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

Elevation:

Site Comments: ATV trails thru outlet area & over top of culvert.

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-CT151

Observers: Edward Weiss, Joe Conner, Nathan Pannkuk

Overall Fish Passage Rating: Gray

Tidal: No
Backwatered: No

Step Pools:
Construction Year:


Comments: ATV trails thru outlet area & over top of culvert; apparent inlet controlled-ponded slightlty & wetland areas on upstream side.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated Metal) Fish Passage Rating: Gray
 
Length(ft): 67.0
Inlet Type: Mitered
Outlet Type:
Corrugation Depth(in.): 1.0
Corrugation Width(in.): 3.0
Condition Rating(1-5):
Approach Angle:
Sedimentation At Inlet:
Inlet Substrate: Sand
Outlet Substrate: Gravel
InletOutlet
Width(ft):8.0 8.0
Height(ft):6.1 6.6
Apron Length(ft):
Water Depth(ft):1.2 1.8
Rustline Height(ft):
Substrate Depth(ft):1.9 1.4
Backwatered?:
Baffles Present: No
Embedded?: No
Outfall Height:
Outfall Type:
Constriction Ratio:
Culvert Gradient: -0.25%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. None of this type

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:SandGravel
Subdominant:
Stream Slope(deg.):
Stream Flow Stage:
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Downstream ordinary high water 51.0 27.00
Downstream ordinary high water 100.0 31.50
Upstream ordinary high water 50.0 40.00
Upstream ordinary high water 108.0 41.00

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
OHW Left Bank 86.76
Outlet Culvert Top 1 93.35
Inlet Culvert Top 1 93.71
U/S Thalweg 87.05
D/S Thalweg 0.00 99.0 86.14
D/S Thalweg 48.00 51.0 86.63
D/S Tailcrest or 1st Thalweg 85.00 14.0 87.84
D/S Thalweg 93.60 5.4 86.68
Outlet Invert 1 99.00 0.0 86.86
Outlet Thalweg 1 99.00 0.0 86.86
Road Elev 132.50 95.63
Road Elev 132.50 95.73
Inlet Thalweg 1 166.00 0.0 86.80
Inlet Culvert Invert 1 166.00 0.0 86.69
U/S Thalweg 274.00 108.0 86.64

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