Fish Passage Site 20400592

Coordinates (dec. deg.): 61.73861°, -148.90591°
Legal Description: S019N003E15
Region: South Central
Road Name: Jonesville Mine Road

Datum: NAD83
Quad Name / ITM: Anchorage C-6
AWC Stream #:
Stream Name: Eska Creek

Elevation:

Site Comments: At end of DOT maintained road on Eska Creek mainstem, 2nd crossing upstream. Replaced in 2011.

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 MSB11-ESK01

Project Supervisor: Gillian O'Doherty, Alaska Department of Fish and Game — Anchorage, AK
Observers: John Greuey, Abraham Gioffre

Overall Fish Passage Rating: Green

Tidal: No
Backwatered: No

Step Pools: No
Construction Year: 2011


Site Observations:

  1. None of this type

Comments: Replaced in 2011. **Updated site photos and fish sampling information added from 9/27/16 site visit from 2016 Sampling Unmapped Streams in the MSB project.

Culvert Measurements

ID: 1 Structure Type: Pipe-arch (Structural steel plate) Fish Passage Rating: Green
 
Length(ft): 77.6
Inlet Type: Mitered
Outlet Type: Mitered
Corrugation Depth(in.): 2.0
Corrugation Width(in.): 6.0
Condition Rating(1-5): 5
Approach Angle: 31.0
Sedimentation At Inlet: No
Inlet Substrate: Boulder
Outlet Substrate: Boulder
InletOutlet
Width(ft):19.8 19.8
Height(ft):11.0 10.65
Apron Length(ft):0.0 0.0
Water Depth(ft): 1.0
Rustline Height(ft):
Substrate Depth(ft):
Backwatered?: No
Baffles Present: No
Embedded?: Yes
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 0.99
Culvert Gradient: 4.00%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. None of this type

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:BoulderBoulder
Subdominant:CobbleCobble
Stream Slope(deg.):4
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)
Stream
Width (ft)
Downstream ordinary high water 131.0 22.00
Downstream ordinary high water 176.0 18.50
Downstream ordinary high water 208.0 19.50

Elevations

Locator ID Culvert
Number
River
Distance (ft)1
Distance From
Crossing (ft)2
Relative
Elevation (ft)
D/S Water Surface Elev (water surface elevation used for gradient) 0.00 91.84
D/S Water Surface Elev (water surface elevation used for gradient) 184.00 99.18
D/S Thalweg (profile point in riffle) 191.00 98.57
D/S Water Surface Elev 191.00 99.26
Outlet Invert (Outlet invert at enclosure end of mitered pipe on substrate) 250.00 99.43
D/S Water Surface Elev (Outlet water surface elev) 250.00 100.43
Top of Pipe Outlet 250.00 110.37
Road Elev 275.00 113.69
Inlet Culvert Top 303.60 112.19
Inlet Culvert Invert (Inlet invert at enclosure end of mitered pipe on substrate) 303.60 100.53
U/S Water Surface Elev (Inlet water surface elev) 303.60 102.54
U/S Thalweg (profile pt in riffle) 345.60 104.13
U/S Water Surface Elev 345.60 104.39

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)
Comments: Site sampled 9/27/16. Two adult coho observed downstream, two observed upstream of culvert.

Fish Observations

Species: adult spawning coho salmon Life History: Anadromous
Total Fish Observed: 4 Fish Measured: Fork Lengths (mm) Min: Max: Mean:
Collected/Observed by Gear Type: At Site Visual Observation, Ground (4)  

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