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 MSCS1-CT111

Observers: Edward Weiss, Doug Hill, Joe Conner

Overall Fish Passage Rating: Gray

Tidal: No
Backwatered: No

Step Pools:
Construction Year:


Comments: L. descending bank modified w/chain link fence; Stream abnormally wide in this section - wide and shallow; becomes more stream-like @200'. fill gravel in stream

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated Metal) Fish Passage Rating: Gray
 
Length(ft): 50.0
Inlet Type: Projecting
Outlet Type:
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 2.67
Condition Rating(1-5):
Approach Angle:
Sedimentation At Inlet:
Inlet Substrate: Gravel
Outlet Substrate: Gravel
InletOutlet
Width(ft):4.1 4.1
Height(ft):3.1 3.2
Apron Length(ft):
Water Depth(ft):0.8 0.8
Rustline Height(ft):
Substrate Depth(ft):0.9 0.8
Backwatered?:
Baffles Present: No
Embedded?: No
Outfall Height:
Outfall Type:
Constriction Ratio:
Culvert Gradient: 0.88%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Structural Problem
  2. Culvert sagging in middle

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:GravelGravel
Subdominant:
Stream Slope(deg.):
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Downstream ordinary high water 50.0 22.00
Downstream ordinary high water 100.0 31.50

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
U/S Thalweg 1 89.53
Outlet Culvert Top 1 92.63
Inlet Culvert Top 1 93.07
D/S Water Surface Elev 0.00 100.0 88.14
D/S Thalweg 50.00 50.0 88.25
D/S Thalweg (riffle) 85.00 15.0 89.27
D/S Thalweg 97.00 3.0 89.55
Outlet Invert 1 100.00 0.0 89.40
Road Elev 125.00 94.06
Road Elev 125.00 94.68
Inlet Culvert Invert 1 150.00 0.0 89.87
Inlet Thalweg 1 150.00 0.0 89.87

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

Gear Type: Visual Observation, Air-Not Recorded (C)

Fish Observations

Species: adult sockeye salmon Life History: Anadromous (Suspected Spawning)
Total Fish Observed: Fish Measured: Fork Lengths (mm) Min: Max: Mean:
Collected/Observed by Gear Type: Upstream Visual Observation, Air-Not Recorded ()  
Comments: Adult sockeye observed upstream and downstream of culvert

Photos

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