Fish Passage Site 20400602

Coordinates (dec. deg.): 61.50781°, -148.99826°
Legal Description: S016N003E06
Region: South Central
Road Name: Knik River Road

Datum: NAD83
Quad Name / ITM: Anchorage C-6
AWC Stream #: 247-50-10200-2074
Stream Name: Unnamed

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 MSB23-MS011

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

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:


Site Observations:

  1. Culvert gradient red

Comments: Fence in stream near outlet

Culvert Measurements

ID: 1 Structure Type: Pipe-arch (Corrugated steel) Fish Passage Rating: Red
 
Length(ft): 76.85
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 2.5
Condition Rating(1-5): 3
Approach Angle: 20.0
Sedimentation At Inlet: No
Inlet Substrate: Boulder
Outlet Substrate: Cobble
InletOutlet
Width(ft):5.23 5.2
Height(ft):4.85 4.78
Apron Length(ft):
Water Depth(ft):0.0 1.08
Rustline Height(ft):2.8
Substrate Depth(ft):0.15 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: 0.54
Culvert Gradient: 2.60%
Max Slope:
Max Slope Length:
 

Comments: Grade control inside pipe, large boulder and substrate forms hydraulic jump in pipe
  Culvert Observations:
  1. Culvert gradient red

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:CobbleCobble
Subdominant:BoulderSand
Stream Slope(deg.):3.51
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Upstream ordinary high water 32.0 11.10
Upstream ordinary high water 49.0 8.80
Upstream ordinary high water 85.0 6.90

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Road Elev 98.93
D/S Thalweg 19.00 87.49
D/S Water Surface Elev 19.00 89.51
D/S Thalweg 39.00 88.30
D/S Water Surface Elev 39.00 89.03
D/S Thalweg 84.00 90.31
D/S Water Surface Elev 84.00 91.13
D/S Water Surface Elev 100.00 91.89
Outlet Invert 100.00 90.81
Outlet Culvert Top 100.00 95.44
Inlet Culvert Top 176.85 97.44
Inlet Culvert Invert 176.85 92.83
U/S Water Surface Elev 176.85 93.68
U/S Water Surface Elev 214.85 94.08
U/S Thalweg 214.85 95.18
U/S Thalweg 234.85 95.64
U/S Water Surface Elev 234.85 96.70
U/S Thalweg 267.85 97.04
U/S Water Surface Elev 267.85 97.97
U/S Thalweg 281.85 98.07
U/S Water Surface Elev 281.85 98.75

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