Fish Passage Site 20401268

Coordinates (dec. deg.): 61.62885°, -149.26083°
Legal Description: S018N001E22
Region: South Central
Road Name: Engstrom Road

Datum: NAD83
Quad Name / ITM: Anchorage C-7
AWC Stream #: 247-50-10300-2054
Stream Name: Cornelius and Nekleson Lakes

Elevation:

Site Comments: Culvert inlet at mouth of Cornelius Lake

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 MSB11-ENG01

Project Supervisor: Gillian O'Doherty, Alaska Department of Fish and Game — Anchorage, AK
Observers: John Greuey, Abraham Gioffre

Overall Fish Passage Rating: Green

Tidal: No
Backwatered: No

Step Pools: No
Construction Year: 2010


Site Observations:

  1. Constriction ratio gray

Comments: Post-replacment survey. Resurvey of MSCS1CT111 and MSB10ENG01

Culvert Measurements

ID: 1 Structure Type: Open-bottom arch (Corrugated steel) Fish Passage Rating: Green
 
Length(ft): 95.15
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 1.0
Corrugation Width(in.): 3.0
Condition Rating(1-5): 5
Approach Angle: 3.0
Sedimentation At Inlet: No
Inlet Substrate: Gravel
Outlet Substrate: Cobble
InletOutlet
Width(ft):8.45 8.25
Height(ft):5.08 4.98
Apron Length(ft):0.0 0.0
Water Depth(ft): 0.68
Rustline Height(ft):0.0
Substrate Depth(ft):
Backwatered?: No
Baffles Present: No
Embedded?: Yes
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio:
Culvert Gradient: 0.91%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Constriction ratio gray

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:GravelGravel
Subdominant:CobbleSand
Stream Slope(deg.):0.92
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Downstream ordinary high water 83.0 13.00
Downstream ordinary high water 124.0 13.20
Downstream ordinary high water 155.0 12.80

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
D/S Grade Ctrl (Thalweg) (Top of riffle) 0.00 85.93
D/S Water Surface Elev (Used for stream gradient) 0.00 86.27
D/S Grade Ctrl (Thalweg) (Top of riffle) 50.00 86.69
D/S Water Surface Elev 50.00 87.17
D/S Thalweg (Down stream profile point.Top of glide) 92.00 87.36
D/S Water Surface Elev 92.00 87.73
Outlet Pool Water Elev (Water surface at max pool) 164.00 87.78
Max Pool Depth (Outlet pool depth at bottom of outlet riffle 36' downstream.) 164.00 87.00
Outlet Culvert Top 220.00 93.20
Outlet Invert (On substrate) 220.00 87.97
D/S Water Surface Elev (Water surface at outlet invert) 220.00 88.65
Road Elev (Center of road) 267.00 97.77
Inlet Culvert Invert (On substrate) 315.15 88.89
Inlet Culvert Top 315.15 94.07
U/S Water Surface Elev (Water surface at inlet invert) 315.15 89.67
U/S Water Surface Elev (Water surface of lake) 335.15 89.71
U/S Grade Ctrl (Thalweg) (Cobble substrate in lake) 335.15 88.89

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