Fish Passage Site 20100479

Coordinates (dec. deg.): 60.46778°, -145.35909°
Legal Description: C016S001W23
Region: South Central
Road Name: Copper River Highway

Datum: NAD83
Quad Name / ITM: Cordova B-4
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 CRWP17-Cop13

Observers: Kirsti Jurica, Hoots Witsoe

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:


Site Observations:

  1. Culvert is poorly aligned
  2. Constriction ratio red
  3. Culvert gradient red
  4. Inlet perch
  5. Beaver Activity

Comments: Numerous juvenile Coho salmon observed upstream and downstream of crossing. Old beaver activity, but nothing looks recent. Old glacial floodplain, connectivity of upstream surface water limited, but there is some flowing water with gravels upstream. Sprawling multi-channeled upstream. Partial blockage at inlet from organic and wood debris causing a hydraulic jump.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Red
 
Length(ft): 65.5
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 2.75
Condition Rating(1-5): 3
Approach Angle: 30.0
Sedimentation At Inlet: Yes
Inlet Substrate: Organic
Outlet Substrate: Organic
InletOutlet
Width(ft):3.9 4.0
Height(ft):2.81 3.08
Apron Length(ft):
Water Depth(ft): 0.48
Rustline Height(ft):1.5
Substrate Depth(ft):1.4 1.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 0.305
Culvert Gradient: 1.20%
Max Slope:
Max Slope Length:
 

Comments: Debris at inlet causing inlet perch and jump.
  Culvert Observations:
  1. Culvert gradient red
  2. Constriction ratio red
  3. Culvert is poorly aligned
  4. Inlet perch
  5. Beaver Activity

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:GravelGravel
Subdominant:OrganicOrganic
Stream Slope(deg.):0.5
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Upstream ordinary high water 11.30
Upstream ordinary high water 12.50
Upstream ordinary high water 14.50

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Road Elev 100.00
D/S Tailcrest or 1st Thalweg 0.00 90.74
D/S Water Surface Elev 0.00 91.46
Outlet Pool Water Elev 45.00 91.49
Max Pool Depth 45.00 90.51
Outlet Invert (on substrate) 70.00 91.01
D/S Water Surface Elev 70.00 91.49
Outlet Culvert Top 70.00 94.09
Inlet Culvert Top 135.00 95.01
U/S Water Surface Elev 135.00 92.68
Inlet Culvert Invert (on substrate) 135.00 92.20
U/S Grade Ctrl (Thalweg) 139.00 90.42
U/S Water Surface Elev 139.00 92.72
U/S Water Surface Elev 241.00 92.79
U/S Grade Ctrl (Thalweg) 241.00 92.51

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

Fish Observations

Species: juvenile coho salmon Life History: Anadromous
Total Fish Observed: 2 Fish Measured: 2 Fork Lengths (mm) Min: 35 Max: 40 Mean: 37
Collected/Observed by Gear Type: Not Recorded Minnow Trap (2)  

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