Fish Passage Site 10103556

Coordinates (dec. deg.): 55.89829°, -133.01582°
Legal Description: C069S081E08
Region: Southeast
Road Name: Coffman Cove Road

Datum: NAD83
Quad Name / ITM: Craig D-4
AWC Stream #:
Stream Name: Unnamed

Elevation:

Site Comments: Site next to road #2300500.

Survey Date: Jun 06, 2017

Survey SEA17-CVR07

Observers: Mark Eisenman, Elizabeth Flory, Kelly Petty

Overall Fish Passage Rating: Gray

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:


Site Observations:

  1. Culvert gradient gray

Comments: Clay bottom in most places.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Gray
 
Length(ft): 106.5
Inlet Type: Mitered
Outlet Type: Mitered
Corrugation Depth(in.): 2.0
Corrugation Width(in.): 4.4
Condition Rating(1-5): 4
Approach Angle: 0.0
Sedimentation At Inlet: Yes
Inlet Substrate: Organic
Outlet Substrate: Organic
InletOutlet
Width(ft):7.6 8.0
Height(ft):3.9 5.0
Apron Length(ft):
Water Depth(ft): 0.34
Rustline Height(ft):0.0
Substrate Depth(ft):3.7 3.0
Backwatered?: No
Baffles Present: No
Embedded?: Yes
Embedded Depth(ft): 3.0
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 4.06
Culvert Gradient: -0.17%
Max Slope:
Max Slope Length:
 

Comments: No visible rustline. Top of outlet slightly higher than inlet giving negative gradient. Lots of silt inside culvert. Top of culvert length 97.5. Looks like some substrate from the downstream end of the culvert has been scoured away or the culvert was not filled to spray paint line.
  Culvert Observations:
  1. Culvert gradient gray

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:Silt/ClaySilt/Clay
Subdominant:GravelGravel
Stream Slope(deg.):1.1
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Upstream ordinary high water 50.0 2.50
Upstream ordinary high water 100.0 1.90
Upstream ordinary high water 150.0 1.50

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Road Elev 109.35
D/S Grade Ctrl (Thalweg) (top of clay lump) 0.00 93.34
D/S Water Surface Elev 0.00 93.51
D/S Tailcrest or 1st Thalweg (rocks) 17.00 94.72
D/S Water Surface Elev 17.00 94.85
D/S Water Surface Elev 23.00 94.90
Outlet Invert (end of mitre well buried) 23.00 94.56
Outlet Culvert Top 32.00 100.00
Inlet Culvert Top 129.50 99.83
U/S Headwater (boulders) 145.50 95.73
U/S Water Surface Elev 145.50 96.03
U/S Grade Ctrl (Thalweg) (log) 162.50 96.08
U/S Water Surface Elev 162.50 96.47
U/S Water Surface Elev 209.50 96.99
U/S Thalweg (stream splits here) 209.50 97.24

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
Comments: rainbow 80ft upstream, traps reset overnight
 
Gear Type: Minnow Trap (B) Trap Duration(h): 3.0
Comments: 1 coho 20ft downstream, traps reset overnight
 
Gear Type: Minnow Trap (C) Trap Duration(h): 19.0
Comments: rainbow
 
Gear Type: Minnow Trap (D) Trap Duration(h): 19.0
Comments: coho

Fish Observations

Species: juvenile coho salmon Life History:
Total Fish Observed: 2 Fish Measured: 2 Fork Lengths (mm) Min: 39 Max: 79 Mean: 59
Collected/Observed by Gear Type: Downstream Minnow Trap (1)  Downstream Minnow Trap (1)  
 
Species: juvenile rainbow trout Life History:
Total Fish Observed: 3 Fish Measured: 3 Fork Lengths (mm) Min: 78 Max: 88 Mean: 82
Collected/Observed by Gear Type: Upstream Minnow Trap (2)  Upstream Minnow Trap (1)  

Questions or comments about this report can be directed to dfg.dsf.webmaster@alaska.gov