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 MSB23-MS023

Project Supervisor: Michael Mazzacavallo, Alaska Department of Fish and Game — Anchorage, AK
Observers: Michael Mazzacavallo, Kat Leavitt, Beth Evers

Overall Fish Passage Rating: Gray

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:


Site Observations:

  1. Compound gradient in pipe

Comments: Channel is a ditch, no constriction ratio. Gradient change 10ft into pipe from inlet side.

Culvert Measurements

ID: 1 Structure Type: Pipe-arch (Corrugated steel) Fish Passage Rating: Gray
 
Length(ft): 53.97
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 2.5
Condition Rating(1-5): 3
Approach Angle: 0.0
Sedimentation At Inlet: No
Inlet Substrate: Organic
Outlet Substrate: Organic
InletOutlet
Width(ft):2.44 2.42
Height(ft):2.12 2.49
Apron Length(ft):
Water Depth(ft): 1.08
Rustline Height(ft):1.9
Substrate Depth(ft):0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Embedded Depth(ft): 0.0
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio:
Culvert Gradient: 0.63%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Compound gradient in pipe

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:OrganicOrganic
Subdominant:Silt/ClaySilt/Clay
Stream Slope(deg.):0.5
Stream Flow Stage:Medium

No stream width data available.

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Road Elev 98.34
U/S Thalweg 0.00 93.54
U/S Water Surface Elev 0.00 94.96
U/S Water Surface Elev (inlet WS) 153.00 94.32
Inlet Culvert Invert 153.00 93.25
Inlet Culvert Top 153.00 95.42
Outlet Invert 206.95 92.64
Outlet Pool Water Elev 206.95 93.72
Outlet Culvert Top 206.95 95.08
D/S Water Surface Elev 269.95 93.62
D/S Thalweg 269.95 95.52

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