Fish Passage Site 20403972

Coordinates (dec. deg.): 61.48053°, -149.13144°
Legal Description: S016N002E17
Region: South Central
Road Name: Old Glenn Highway

Datum: WGS84
Quad Name / ITM: Anchorage B-6
AWC Stream #:
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-OLG01

Project Supervisor: Michael Mazzacavallo, Alaska Department of Fish and Game — Anchorage, AK
Observers: Michael Mazzacavallo, Kevin Keith, Amy LaBarre

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools: No
Construction Year: 2020


Site Observations:

  1. Compound gradient in pipe

Comments: None

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Red
 
Length(ft): 49.04
Inlet Type: Headwall
Outlet Type: Headwall
Corrugation Depth(in.): 0.25
Corrugation Width(in.): 2.5
Condition Rating(1-5): 5
Approach Angle:
Sedimentation At Inlet: No
Inlet Substrate: Cobble
Outlet Substrate: Cobble
InletOutlet
Width(ft):4.5 4.4
Height(ft):4.5 4.5
Apron Length(ft):
Water Depth(ft):0.0 0.11
Rustline Height(ft):0.0
Substrate Depth(ft):0.0 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.46
Outfall Type: Cascade Over Rip-Rap
Constriction Ratio:
Culvert Gradient: 0.60%
Max Slope: 19.4
Max Slope Length: 25.0
 

Comments: Cuvlet located between two ponds/wetland complexes, constriction ratio was not calculated. Many dead sickleback and a couple dead black fish along rip rap skirt at the outler. Gradient in culvert gets slightly steeper halfway through culvert.
  Culvert Observations:
  1. Compound gradient in pipe

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:OrganicOrganic
Subdominant:Sand/Silt/Clay (legacy)Sand/Silt/Clay (legacy)
Stream Slope(deg.):0
Stream Flow Stage:Low

No stream width data available.

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Road Elev 97.94
D/S Water Surface Elev (D/S Pond WS) 0.00 90.72
D/S Thalweg (D/S Pond Depth) 0.00 88.71
D/S Thalweg 6.00 90.62
D/S Thalweg 11.50 90.74
D/S Water Surface Elev 11.50 90.85
Outlet Invert 13.20 91.07
D/S Water Surface Elev 13.20 91.18
Outlet Culvert Top 13.20 95.55
Inlet Culvert Top 62.24 95.87
U/S Water Surface Elev 62.24 91.73
Inlet Culvert Invert 62.24 91.37
U/S Thalweg 65.24 91.31
U/S Water Surface Elev (U/S Pond WS) 73.24 91.61
U/S Thalweg (U/S Pond Depth) 73.24 88.12

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