Fish Passage Site 20403899

Coordinates (dec. deg.): 61.48004°, -148.88965°
Legal Description: S016N003E15
Region: South Central
Road Name: Knik River Road

Datum: NAD83
Quad Name / ITM: Anchorage B-6
AWC Stream #: 247-50-10200-2106
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-MS007

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

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:


Site Observations:

  1. Culvert gradient red

Comments: Upstream channel ditched; BMP still at site; head cut 38ft D/S of outlet

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Red
 
Length(ft): 44.87
Inlet Type: Flush
Outlet Type: Flush
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 3.0
Condition Rating(1-5): 4
Approach Angle: 86.0
Sedimentation At Inlet: No
Inlet Substrate: Sand
Outlet Substrate: Cobble
InletOutlet
Width(ft):3.0 3.0
Height(ft):3.0 3.0
Apron Length(ft):4.7 4.7
Water Depth(ft):0.0 0.38
Rustline Height(ft):0.6
Substrate Depth(ft):0.0 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Embedded Depth(ft): 0.0
Outfall Height:
Outfall Type: Smooth Flow Over Apron
Constriction Ratio: 0.82
Culvert Gradient: 4.57%
Max Slope:
Max Slope Length:
 

Comments: Inlet/Oulet type Apron. Looks to have had no repairs to apron since 2016
  Culvert Observations:
  1. Culvert gradient red

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:GravelGravel
Subdominant:SandSand
Stream Slope(deg.):3.72
Stream Flow Stage:Low
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Downstream ordinary high water 23.0 3.90
Downstream ordinary high water 53.0 3.70
Downstream ordinary high water 150.0 3.45

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
D/S Thalweg (Out Apron Top) 98.22
D/S Water Surface Elev (Out Apron WS) 98.23
D/S Thalweg (Out Apron Bottom) 98.31
U/S Thalweg (In Apron Top) 100.34
U/S Thalweg (In Apron Bottom) 100.72
U/S Water Surface Elev (In Apron WS) 100.78
D/S Thalweg 0.00 93.46
D/S Water Surface Elev 0.00 93.68
D/S Water Surface Elev 10.00 93.86
D/S Thalweg 10.00 92.60
D/S Thalweg 33.00 91.61
D/S Water Surface Elev 33.00 94.35
D/S Water Surface Elev 61.00 96.03
D/S Thalweg 61.00 94.16
D/S Thalweg 63.00 97.26
D/S Water Surface Elev 63.00 97.61
D/S Water Surface Elev 94.50 97.99
D/S Thalweg 94.50 97.47
D/S Water Surface Elev 100.00 98.65
Outlet Invert 100.00 98.27
Outlet Culvert Top 100.00 101.30
Inlet Culvert Top 144.87 103.35
Inlet Culvert Invert 144.87 100.38
U/S Water Surface Elev 144.87 100.82
U/S Water Surface Elev 149.87 100.85
U/S Thalweg 149.87 100.51
U/S Water Surface Elev 174.37 100.92
U/S Thalweg 174.37 100.12
U/S Thalweg 187.87 100.78
U/S Water Surface Elev 187.87 100.99
U/S Water Surface Elev 195.87 100.97
U/S Thalweg 195.87 100.69

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