Fish Passage Site 20401267

Coordinates (dec. deg.): 61.63185°, -149.24325°
Legal Description: S018N001E22
Region: South Central
Road Name: Settlement Road

Datum: WGS84
Quad Name / ITM: Anchorage C-6
AWC Stream #: 247-50-10300-2054
Stream Name: Cottonwood Creek

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-CT110

Observers: Edward Weiss, Doug Hill, Joe Conner

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools:
Construction Year:


Site Observations:

  1. Constriction ratio red

Comments: bullet holes in barrel @ inlet. Upstream thalweg (wetland-like, but mossy banks); Stream cross section (11.5' & 15.0' - sticks and woody debris/15.0' & 22.5 - emergent grass)

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated Metal) Fish Passage Rating: Red
 
Length(ft): 60.7
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: Silt/Clay
Outlet Substrate: Silt/Clay
InletOutlet
Width(ft):3.9 3.9
Height(ft):4.2 4.1
Apron Length(ft):
Water Depth(ft):1.3 0.7
Rustline Height(ft):
Substrate Depth(ft):0.0 0.0
Backwatered?:
Baffles Present: No
Embedded?: No
Outfall Height:
Outfall Type:
Constriction Ratio: 0.35
Culvert Gradient: -0.35%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Culvert is poorly aligned

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 50.0 19.50
Downstream ordinary high water 100.0 13.00
Upstream ordinary high water 50.0 10.60
Upstream ordinary high water 100.0 12.00

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
U/S Thalweg 86.43
D/S Thalweg 86.76
D/S Thalweg 86.85
U/S Thalweg 87.70
Inlet Culvert Top 1 91.81
Outlet Culvert Top 1 91.93
D/S Tailcrest or 1st Thalweg (Changed from 11.69 to 13.55 error in data entry RES) 0.00 18.0 88.31
OHW Left Bank 4.00 14.0 85.83
D/S Thalweg 9.00 9.0 85.53
Outlet Invert 1 18.00 0.0 87.85
Outlet Thalweg 1 18.00 0.0 87.32
Road Elev 48.00 94.71
Road Elev 48.00 95.22
Inlet Thalweg 1 78.00 0.0 87.47
Inlet Culvert Invert 1 78.00 0.0 87.64

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.

Photos

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