Fish Passage Site 20100511

Coordinates (dec. deg.): 60.44318°, -145.12714°
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-Cop45

Observers: Kirsti Jurica, Hoots Witsoe

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:


Site Observations:

  1. Culvert gradient red
  2. Constriction ratio red
  3. Culvert is too short
  4. Shallow fill; inadequate roadfill volume above culvert
  5. Culvert sagging in middle
  6. Structural Problem

Comments: Culvert assessment performed and submitted by the Copper River Watershed Project. Spring fed system from Saddlebag system, lots of upwelling upstream and downstream from crossing. Numerous juvenile Coho salmon observed upstream.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Red
 
Length(ft): 38.0
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 2.75
Condition Rating(1-5): 1
Approach Angle: 10.0
Sedimentation At Inlet: Yes
Inlet Substrate: Gravel
Outlet Substrate: None
InletOutlet
Width(ft):4.5 3.7
Height(ft):2.76 2.92
Apron Length(ft):
Water Depth(ft): 0.93
Rustline Height(ft):1.0
Substrate Depth(ft):0.1 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 0.36
Culvert Gradient: 1.90%
Max Slope:
Max Slope Length:
 

Comments: Inlet and outlet damage, culvert looks squashed. Culvert shows significant signs of deterioration and a large dent/failure in the middle of pipe. Tops culverts damaged. Water surface gradient through culvert 0.26%, Top of culvert gradient 1.47%, but tops are damaged. Gradient calculated by substraction inlet substrate from IINV elevation.
  Culvert Observations:
  1. Constriction ratio red
  2. Culvert gradient red
  3. Structural Problem
  4. Shallow fill; inadequate roadfill volume above culvert
  5. Culvert sagging in middle
  6. Culvert is too short

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:GravelGravel
Subdominant:Silt/ClaySilt/Clay
Stream Slope(deg.):1
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 Thalweg 0.00 95.59
D/S Water Surface Elev 0.00 96.78
Outlet Culvert Top 15.00 98.77
Outlet Invert (on pipe) 15.00 95.85
D/S Water Surface Elev 15.00 96.78
Inlet Culvert Invert (on substrate) 53.00 96.57
Inlet Culvert Top 53.00 99.33
U/S Water Surface Elev 53.00 96.88
U/S Water Surface Elev 63.00 96.99
U/S Grade Ctrl (Thalweg) 63.00 95.40

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): 3.0
 
Gear Type: Minnow Trap (B) Trap Duration(h): 3.0

Fish Observations

Species: juvenile coho salmon Life History: Anadromous
Total Fish Observed: 8 Fish Measured: 8 Fork Lengths (mm) Min: 45 Max: 85 Mean: 66
Collected/Observed by Gear Type: Not Recorded Minnow Trap (7)  Not Recorded Minnow Trap (1)  

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