Fish Passage Site 20100580

Coordinates (dec. deg.): 61.98817°, -147.01354°
Legal Description: C002N010W02
Region: South Central
Road Name: Glenn Highway

Datum: NAD83
Quad Name / ITM: Anchorage D-1
AWC Stream #:
Stream Name: Unnamed

Elevation:

Site Comments: Little Nelchina River Tributary

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 CRWP17-Glen7

Observers: Kirsti Jurica, Hoots Witsoe

Overall Fish Passage Rating: Gray

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:


Site Observations:

  1. Culvert gradient gray
  2. Outfall height gray
  3. Beaver Activity
  4. Culvert is poorly aligned
  5. Road bank erosion
  6. Inlet perch

Comments: Culvert assessment performed and submitted by the Copper River Watershed Project. Arctic grayling caught upstream. Steep road fill rip rap sloughing into inlet and outlet causing oversteepened profile.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Gray
 
Length(ft): 151.2
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.2
Corrugation Width(in.): 2.75
Condition Rating(1-5): 3
Approach Angle: 30.0
Sedimentation At Inlet: No
Inlet Substrate: Cobble
Outlet Substrate: Cobble
InletOutlet
Width(ft):7.7 7.3
Height(ft):6.57 6.05
Apron Length(ft):
Water Depth(ft): 1.5
Rustline Height(ft):1.31
Substrate Depth(ft):0.46 0.8
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.32
Outfall Type: Cascade Over Rip-Rap
Constriction Ratio: 0.95
Culvert Gradient: 1.30%
Max Slope:
Max Slope Length:
 

Comments: Inlet damage. Small cascade outlall at outlet caused by rip rap sloughing into creek.
  Culvert Observations:
  1. Culvert gradient gray
  2. Outfall height gray
  3. Beaver Activity
  4. Culvert is poorly aligned
  5. Road bank erosion
  6. Inlet perch

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:CobbleCobble
Subdominant:GravelGravel
Stream Slope(deg.):1.5
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Upstream ordinary high water 8.90
Upstream ordinary high water 7.10
Upstream ordinary high water 7.90
Upstream ordinary high water 8.50

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Road Elev 123.57
D/S Grade Ctrl (Thalweg) 0.00 83.43
D/S Water Surface Elev 0.00 84.01
D/S Tailcrest or 1st Thalweg 81.00 84.95
D/S Water Surface Elev 81.00 85.26
Outlet Pool Water Elev 96.00 85.36
Max Pool Depth 96.00 94.16
D/S Thalweg (riffles over rip rap) 104.00 84.91
D/S Water Surface Elev 104.00 85.67
Outlet Invert (on substrate) 110.00 84.47
D/S Water Surface Elev 110.00 85.99
Outlet Culvert Top 110.00 90.52
Inlet Culvert Top 261.00 92.41
U/S Water Surface Elev 261.00 86.65
Inlet Culvert Invert (on substrate) 261.00 85.84
U/S Grade Ctrl (Thalweg) 263.00 85.38
U/S Water Surface Elev 263.00 86.93
U/S Grade Ctrl (Thalweg) 276.00 87.08
U/S Water Surface Elev 276.00 87.62
U/S Water Surface Elev 295.00 87.94
U/S Grade Ctrl (Thalweg) 295.00 87.04
U/S Grade Ctrl (Thalweg) 379.00 88.59
U/S Water Surface Elev 379.00 89.37
U/S Water Surface Elev 406.00 89.42
U/S Grade Ctrl (Thalweg) 406.00 88.09

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: Minnow Trap (A) Trap Duration(h): 18.0
Comments: No fish caught
 
Gear Type: Minnow Trap (B) Trap Duration(h): 18.0
 
Gear Type: Minnow Trap (C) Trap Duration(h): 18.0
Comments: No fish caught
 
Gear Type: Minnow Trap (D) Trap Duration(h): 18.0
Comments: No fish caught
 
Gear Type: Minnow Trap (E) Trap Duration(h): 18.0
 
Gear Type: Minnow Trap (F) Trap Duration(h): 18.0
Comments: No fish caught

Fish Observations

Species: juvenile Arctic grayling Life History: Resident
Total Fish Observed: 2 Fish Measured: 2 Fork Lengths (mm) Min: 70 Max: 80 Mean: 75
Collected/Observed by Gear Type: Not Recorded Minnow Trap (1)  Not Recorded Minnow Trap (1)  

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