Fish Passage Site 20400597

Coordinates (dec. deg.): 61.48856°, -148.90274°
Legal Description: S016N003E10
Region: South Central
Road Name: Knik River Road

Datum: NAD83
Quad Name / ITM: Anchorage B-6
AWC Stream #: 247-50-10200-2096
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-MS008

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

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:


Site Observations:

  1. Culvert gradient red
  2. Culvert sagging in middle

Comments: Downstream channel potentially unnatural, looks altered by humans.

Culvert Measurements

ID: 1 Structure Type: Pipe-arch (Corrugated steel) Fish Passage Rating: Red
 
Length(ft): 60.7
Inlet Type: Flush
Outlet Type: Projecting
Corrugation Depth(in.): 1.25
Corrugation Width(in.): 3.0
Condition Rating(1-5): 4
Approach Angle: 0.0
Sedimentation At Inlet: No
Inlet Substrate: Gravel
Outlet Substrate: Sand
InletOutlet
Width(ft):6.75 6.9
Height(ft):5.68 4.58
Apron Length(ft):6.4 0.0
Water Depth(ft):0.0 0.82
Rustline Height(ft):0.82
Substrate Depth(ft):0.0 0.48
Backwatered?: No
Baffles Present:
Embedded?: No
Embedded Depth(ft): 0.0
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 0.74
Culvert Gradient: 3.74%
Max Slope:
Max Slope Length:
 

Comments: Compound gradient in culvert #1.

  Culvert Observations:
  1. Culvert gradient red
  2. Culvert sagging in middle
ID: 2 Structure Type: Pipe-arch (Corrugated steel) Fish Passage Rating:
 
Length(ft): 60.38
Inlet Type: Flush
Outlet Type: Projecting
Corrugation Depth(in.): 1.25
Corrugation Width(in.): 3.0
Condition Rating(1-5): 4
Approach Angle: 0.0
Sedimentation At Inlet: Yes
Inlet Substrate: Sand
Outlet Substrate: Sand
InletOutlet
Width(ft):5.14 6.66
Height(ft):6.6 3.75
Apron Length(ft):4.2
Water Depth(ft):0.0 0.0
Rustline Height(ft):1.3
Substrate Depth(ft):0.3 0.44
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: Overflow Pipe
Constriction Ratio: 0.74
Culvert Gradient: 3.74%
Max Slope:
Max Slope Length:
 

Comments: Culvert #2 has a inlet perch and is a drainage overflow pipe, not rated for fish passage.

  Culvert Observations:
  1. Culvert gradient red
  2. Culvert sagging in middle

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:GravelGravel
Subdominant:SandSand
Stream Slope(deg.):3.8
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)
Stream
Width (ft)
Upstream ordinary high water 30.0 8.00
Upstream ordinary high water 56.0 9.30
Upstream ordinary high water 72.0 10.00

Elevations

Locator ID Culvert
Number
River
Distance (ft)1
Distance From
Crossing (ft)2
Relative
Elevation (ft)
Outlet Invert 2 89.32
Inlet Culvert Invert 2 90.58
U/S Thalweg (Inlet Apron Top) 1 91.23
U/S Thalweg (Inlet Apron Bottom) 1 91.62
Outlet Culvert Top 2 93.05
U/S Water Surface Elev (Inlet Apron WS) 92.11
U/S Thalweg (sedimentation infront of inlet) 2 92.39
Inlet Culvert Top 2 95.81
Road Elev 98.24
D/S Thalweg 0.00 86.07
D/S Water Surface Elev 0.00 86.31
D/S Thalweg 24.60 86.50
D/S Water Surface Elev 24.60 87.09
D/S Thalweg 45.00 87.36
D/S Water Surface Elev 45.00 87.82
D/S Thalweg 68.00 88.16
D/S Water Surface Elev 68.00 88.68
D/S Water Surface Elev 1 100.00 89.49
Outlet Invert 1 100.00 88.67
Outlet Culvert Top 1 100.00 93.20
Inlet Culvert Top 1 160.70 96.56
Inlet Culvert Invert 1 160.70 91.16
U/S Water Surface Elev (Inlet WS) 1 160.70 91.76
U/S Thalweg 180.70 91.64
U/S Water Surface Elev 180.70 92.53
U/S Water Surface Elev 196.70 93.31
U/S Thalweg 196.70 92.43
U/S Water Surface Elev 227.70 94.79
U/S Thalweg 227.70 94.29
U/S Thalweg 237.70 94.57
U/S Water Surface Elev 237.70 95.25

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

No photos available.

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