Fish Passage Site 20501442

Coordinates (dec. deg.): 61.70671°, -150.00012°
Legal Description: S019N004W28
Region: South Central
Road Name: Old Parks Highway

Datum: NAD83
Quad Name / ITM: Anchorage C-8
AWC Stream #: 247-41-10100-2231-3080
Stream Name: Lilly Creek

Elevation:

Site Comments: SUSITNA RIVER WATERSHED

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-MS067

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

Overall Fish Passage Rating: Gray

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:


Site Observations:

  1. Outfall height gray

Comments: None

Culvert Measurements

ID: 1 Structure Type: Pipe-arch (Structural steel plate) Fish Passage Rating: Gray
 
Length(ft): 107.78
Inlet Type: Mitered
Outlet Type: Mitered
Corrugation Depth(in.): 2.0
Corrugation Width(in.): 6.0
Condition Rating(1-5): 4
Approach Angle: 46.0
Sedimentation At Inlet: No
Inlet Substrate: Sand
Outlet Substrate: Sand
InletOutlet
Width(ft):9.4 9.5
Height(ft):6.42 5.91
Apron Length(ft):
Water Depth(ft):0.0
Rustline Height(ft):1.6
Substrate Depth(ft):0.0 0.4
Backwatered?: No
Baffles Present: No
Embedded?: No
Embedded Depth(ft): 0.0
Outfall Height: 0.15
Outfall Type: Free Fall In To Pool
Constriction Ratio: 0.82
Culvert Gradient: 0.72%
Max Slope:
Max Slope Length:
 

Comments: Mittered with potential headwall at inlet and outlet. Mittered lengths: outlet 5.6, inlet 5.9. Outfall height estimated based off photos. Calculation adjusted/long pro adjusted.

  Culvert Observations:
  1. Outfall height gray

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:SandGravel
Subdominant:GravelSand
Stream Slope(deg.):1.11
Stream Flow Stage:High
Stream Width Type Distance From
Crossing (ft)
Stream
Width (ft)
Upstream ordinary high water 67.0 12.10
Upstream ordinary high water 94.0 13.90
Upstream ordinary high water 115.0 10.30
Upstream ordinary high water 150.0 9.77

Elevations

Locator ID Culvert
Number
River
Distance (ft)1
Distance From
Crossing (ft)2
Relative
Elevation (ft)
Road Elev 101.22
D/S Thalweg 0.00 85.99
D/S Water Surface Elev 0.00 86.85
D/S Water Surface Elev 9.00 87.24
D/S Thalweg 9.00 86.47
D/S Thalweg 39.00 86.63
D/S Water Surface Elev 39.00 87.65
D/S Water Surface Elev 66.00 88.06
D/S Thalweg 66.00 87.38
Outlet Invert 100.00 87.98
D/S Water Surface Elev 100.00 88.59
Outlet Culvert Top 100.00 94.12
Inlet Culvert Top 207.78 94.90
U/S Water Surface Elev 207.78 89.37
Inlet Culvert Invert 207.78 88.51
U/S Thalweg 262.78 89.97
U/S Water Surface Elev 262.78 90.27
U/S Thalweg 294.78 90.16
U/S Water Surface Elev 294.78 90.17
U/S Thalweg 357.78 91.27
U/S Water Surface Elev 357.78 92.02

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