Fish Passage Site 10103534

Coordinates (dec. deg.): 55.57517°, -133.06174°
Legal Description: C073S081E02
Region: Southeast
Road Name: Big Salt Lake Road

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

Elevation:

Site Comments: Near milepost 2.

Survey Date: Jul 15, 2017

Survey SEA17-BSL17

Observers: Elizabeth Flory, Kelly Petty

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:


Site Observations:

  1. Culvert gradient red

Comments: Upstream steep riffle with small step pools, very brushy. Downstream low gradient riffle and pool down to same broad gravel plain as BSL16.

Culvert Measurements

ID: 1 Structure Type: Oval (Structural aluminum plate) Fish Passage Rating: Red
 
Length(ft): 88.1
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 3.0
Corrugation Width(in.): 9.0
Condition Rating(1-5): 5
Approach Angle: 0.0
Sedimentation At Inlet: Yes
Inlet Substrate: None
Outlet Substrate: Silt/Clay
InletOutlet
Width(ft):7.2 7.2
Height(ft):6.3 4.1
Apron Length(ft):
Water Depth(ft): 1.04
Rustline Height(ft):
Substrate Depth(ft): 2.2
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 1.79
Culvert Gradient: 10.21%
Max Slope:
Max Slope Length:
 

Comments: Water surface gradient through culvert 7.17%.
  Culvert Observations:
  1. Culvert gradient red

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:BoulderGravel
Subdominant:Cobble
Stream Slope(deg.):
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Downstream ordinary high water 20.0 3.80
Downstream ordinary high water 40.0 4.25
Downstream ordinary high water 70.0 3.50
Upstream ordinary high water 10.0 4.75
Upstream ordinary high water 50.0 3.75
Upstream ordinary high water 70.0 3.50

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Road Elev 109.73
D/S Grade Ctrl (Thalweg) 0.00 96.13
D/S Water Surface Elev 0.00 96.40
D/S Tailcrest or 1st Thalweg 12.00 96.65
D/S Water Surface Elev 12.00 96.84
D/S Water Surface Elev 24.00 96.56
Max Pool Depth 24.00 95.74
Outlet Invert 32.00 95.55
D/S Water Surface Elev 32.00 96.59
Outlet Culvert Top 33.00 100.00
Inlet Culvert Invert (on pipe) 121.00 102.71
U/S Water Surface Elev 121.00 102.91
Inlet Culvert Top 121.00 108.99
U/S Grade Ctrl (Thalweg) 129.00 103.46
U/S Water Surface Elev 129.00 103.48
U/S Grade Ctrl (Thalweg) 145.00 106.21
U/S Water Surface Elev 145.00 106.64

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): 1.2
Comments: 20ft upstream
 
Gear Type: Minnow Trap (B) Trap Duration(h): 1.0
Comments: 20ft downstream, 6 dollys

Fish Observations

Species: juvenile Dolly Varden Life History: Unknown
Total Fish Observed: 6 Fish Measured: 6 Fork Lengths (mm) Min: 68 Max: 106 Mean: 84
Collected/Observed by Gear Type: Downstream Minnow Trap (6)  

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