Fish Passage Site 20501193

Coordinates (dec. deg.): 61.45491°, -149.80890°
Legal Description: S016N003W28
Region: South Central
Road Name: Lewis Loop

Datum: WGS84
Quad Name / ITM: Anchorage B-8
AWC Stream #:
Stream Name: Fish Creek 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-MS031

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. Constriction ratio gray
  2. Compound gradient in pipe

Comments: Damage on both culverts, folded metal.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Gray
 
Length(ft): 46.09
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 3.0
Condition Rating(1-5): 3
Approach Angle:
Sedimentation At Inlet: No
Inlet Substrate: Organic
Outlet Substrate: Organic
InletOutlet
Width(ft):2.3 2.1
Height(ft):1.6 2.0
Apron Length(ft):
Water Depth(ft): 0.55
Rustline Height(ft):1.8
Substrate Depth(ft):0.0 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: 0.6
Culvert Gradient: 0.26%
Max Slope:
Max Slope Length:
 

Comments: Took D/S widths due to inlet being a large marsh, no distinct streams U/S. Adjusted length of culvert in calculations to acount for the damage at inlet. (-0.9) Greater slope in lower half pipe, bows in middle.
  Culvert Observations:
  1. Constriction ratio gray
  2. Compound gradient in pipe

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:OrganicOrganic
Subdominant:Sand/Silt/Clay (legacy)Sand/Silt/Clay (legacy)
Stream Slope(deg.):0.96
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Downstream ordinary high water 55.0 4.10
Downstream ordinary high water 82.0 3.60
Downstream ordinary high water 103.0 4.20

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Road Elev 100.22
U/S Thalweg 0.00 97.33
U/S Water Surface Elev 0.00 97.95
U/S Water Surface Elev 100.00 97.77
Inlet Culvert Invert 100.00 96.96
Inlet Culvert Top 100.00 98.88
Outlet Culvert Top 146.09 98.76
Outlet Invert 146.09 96.40
D/S Water Surface Elev 146.09 96.95
D/S Thalweg 249.09 94.47
D/S Water Surface Elev 249.09 95.57

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