Fish Passage Site 20100508

Coordinates (dec. deg.): 60.44235°, -145.13415°
Legal Description: C016S001E36
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-Cop43

Observers: Kirsti Jurica, Hoots Witsoe

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:


Site Observations:

  1. Constriction ratio red
  2. Culvert gradient red
  3. Beaver Activity
  4. Shallow fill; inadequate roadfill volume above culvert
  5. Inlet perch
  6. Hydraulic flows exceeded capacity

Comments: Culvert assessment performed and submitted by the Copper River Watershed Project. Abundant juvenile Coho salmon in system and adults. Downstream beaver dam acting as a tailwater control.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Red
 
Length(ft): 39.9
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 2.75
Condition Rating(1-5): 3
Approach Angle:
Sedimentation At Inlet: No
Inlet Substrate: None
Outlet Substrate: None
InletOutlet
Width(ft):3.0 3.1
Height(ft):2.75 3.02
Apron Length(ft):
Water Depth(ft): 1.62
Rustline Height(ft):0.75
Substrate Depth(ft):0.0 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 0.184
Culvert Gradient: 2.60%
Max Slope:
Max Slope Length:
 

Comments: Constriction ration not completely representative. Downstream is a slow moving slough, upstream is ponded and has 4 upland channels flowing into it and may have multiple drainage points, however constriction is evident from inlet perch, scour, and occasional road flooding. Upstream channels has gravel substrate. Upstream mean widths sum of 4 upland channels.
  Culvert Observations:
  1. Constriction ratio red
  2. Culvert gradient red
  3. Beaver Activity
  4. Shallow fill; inadequate roadfill volume above culvert
  5. Inlet perch
  6. Hydraulic flows exceeded capacity

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:OrganicOrganic
Subdominant:Silt/ClaySilt/Clay
Stream Slope(deg.):
Stream Flow Stage:Medium

No stream width data available.

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Road Elev 100.00
D/S Grade Ctrl (Thalweg) 0.00 93.08
D/S Water Surface Elev 0.00 96.56
D/S Tailcrest or 1st Thalweg (Beaver dam) 46.00 96.67
D/S Water Surface Elev 46.00 97.41
Outlet Pool Water Elev 76.00 97.53
Max Pool Depth 76.00 94.13
D/S Water Surface Elev 86.00 97.53
Outlet Invert (on pipe) 86.00 95.91
Outlet Culvert Top 86.00 98.93
Inlet Culvert Top 126.00 99.71
U/S Water Surface Elev 126.00 98.08
Inlet Culvert Invert (on pipe) 126.00 96.96
U/S Thalweg 131.00 94.51
U/S Water Surface Elev (Pond) 131.00 98.23

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, Ground (A)

Fish Observations

Species: juvenile coho salmon Life History: Anadromous
Total Fish Observed: 15 Fish Measured: Fork Lengths (mm) Min: Max: Mean:
Collected/Observed by Gear Type: At Site Visual Observation, Ground (15)  

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