Fish Passage Site 20401234

Coordinates (dec. deg.): 61.45512°, -148.83777°
Legal Description: S016N003E25
Region: South Central
Road Name: Farmettes Circle

Datum: WGS84
Quad Name / ITM: Anchorage B-5
AWC Stream #:
Stream Name: Knik River tributary

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-MS002

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

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:


Site Observations:

  1. Constriction ratio gray
  2. Compound gradient in pipe
  3. Mechanical damage or joints parting
  4. Material inadequate for designed use
  5. Other, including vibrations, cavitation, etc.
  6. Culvert sagging in middle

Comments: Landowner has witnessed adult salmon at the outlet of the culvert; pool u/s of culvert may or may not be caused by culvert installation

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Red
 
Length(ft): 32.78
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 3.0
Condition Rating(1-5): 1
Approach Angle: 70.0
Sedimentation At Inlet: Yes
Inlet Substrate: Silt/Clay
Outlet Substrate: Silt/Clay
InletOutlet
Width(ft):2.9 2.9
Height(ft):3.1 2.1
Apron Length(ft):
Water Depth(ft):0.0 0.53
Rustline Height(ft):1.9
Substrate Depth(ft):0.0 0.25
Backwatered?: No
Baffles Present:
Embedded?: No
Embedded Depth(ft): 0.0
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 0.73
Culvert Gradient: 2.53%
Max Slope:
Max Slope Length:
 

Comments: Structure Material: Inlet - CSP, Outlet - NCP; Failure Mechanism #7 - ST; 10ft from inlet culvert type CIR added/extended from a rusted falling apart round non-corrugated metal pipe (two different pipes put together); 1-2 ft drop in middle of pipe
  Culvert Observations:
  1. Constriction ratio gray
  2. Compound gradient in pipe
  3. Mechanical damage or joints parting
  4. Material inadequate for designed use
  5. Other, including vibrations, cavitation, etc.
  6. Culvert sagging in middle

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:Silt/ClaySilt/Clay
Subdominant:
Stream Slope(deg.):0.62
Stream Flow Stage:Low
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Downstream ordinary high water 45.0 3.80
Downstream ordinary high water 65.0 3.50
Downstream ordinary high water 100.0 4.80

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Road Elev 99.82
Inlet Culvert Top 0.00 99.37
Inlet Culvert Invert 0.00 96.27
U/S Water Surface Elev 0.00 96.61
Outlet Culvert Top 32.78 97.57
Outlet Invert 32.78 95.25
D/S Water Surface Elev 32.78 95.78
D/S Water Surface Elev 82.78 95.15
D/S Water Surface Elev (Pond) 382.78 93.28

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