Fish Passage Site 20401280

Coordinates (dec. deg.): 61.52640°, -149.51115°
Legal Description: S017N001W31
Region: South Central
Road Name: Snowshoe Road

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-CT129

Observers: Doug Hill, Joe Conner, Sharie Chrisco

Overall Fish Passage Rating: Green

Tidal: No
Backwatered: No

Step Pools:
Construction Year:


Comments: Kids created a waterfall ~20' upstream of culvert; Bankfull not realtistic-V cut from road.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated Metal) Fish Passage Rating: Green
 
Length(ft): 40.0
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: Gravel
Outlet Substrate: Gravel
InletOutlet
Width(ft):6.0 6.0
Height(ft):2.3 3.0
Apron Length(ft):
Water Depth(ft):0.3 0.25
Rustline Height(ft):
Substrate Depth(ft):
Backwatered?: No
Baffles Present: No
Embedded?: Maybe
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio:
Culvert Gradient: -0.03%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. None of this type

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 11.3 11.40
Downstream ordinary high water 50.0 14.10
Upstream ordinary high water 48.0 3.90
Upstream ordinary high water 100.0 3.60

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
D/S Thalweg 90.14
U/S Thalweg 92.78
Inlet Culvert Top 1 93.66
Outlet Culvert Top 1 93.67
D/S Tailcrest or 1st Thalweg 0.00 11.3 90.75
Outlet Invert 1 11.30 0.0 90.70
Outlet Thalweg 1 11.30 0.0 90.70
Road Elev 31.30 96.16
Road Elev 31.30 96.20
Inlet Culvert Invert 1 51.30 0.0 91.39
Inlet Thalweg 1 51.30 0.0 91.39
U/S Thalweg 99.30 48.0 93.76

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

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