Fish Passage Site 20401285

Coordinates (dec. deg.): 61.52568°, -149.51549°
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: Culverts #134 & 135 are only 15' apart. Residential address is 2580 Trapline drive

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-CT134

Observers: Doug Hill, Joe Conner, Sharie Chrisco

Overall Fish Passage Rating:

Tidal: No
Backwatered: No

Step Pools:
Construction Year:


Comments: Culverts #134 & 135 are only 15' apart (stream distance) @ right angle to one another.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated Metal) Fish Passage Rating:
 
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):2.5 2.5
Apron Length(ft):
Water Depth(ft):0.6 0.7
Rustline Height(ft):
Substrate Depth(ft):0.0 0.0
Backwatered?:
Baffles Present: No
Embedded?: No
Outfall Height:
Outfall Type:
Constriction Ratio:
Culvert Gradient: 0.55%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Woody Debris

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)
Upstream ordinary high water 50.0 7.10

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Inlet Culvert Top 1 92.38
D/S Thalweg (Downstream outlet thalweg) 0.00 5.5 89.95
D/S Thalweg (Downstream outlet thalweg) 3.50 2.0 90.23
Outlet Invert 1 5.50 0.0 89.86
Outlet Thalweg 1 5.50 0.0 89.86
Road Elev 25.50 95.27
Road Elev 25.50 95.34
Inlet Culvert Invert 1 45.50 0.0 90.08
Inlet Thalweg 1 45.50 0.0 90.08
U/S Thalweg 47.50 2.0 90.29
U/S Thalweg (Edge of cobbles) 1 49.80 4.3 89.79
U/S Thalweg 95.50 50.0 90.31

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