Fish Passage Site 30303076

Coordinates (dec. deg.): 59.05573°, -158.55849°
Legal Description: S013S056W14
Region: Southwest
Road Name: Emperor Way

Datum: NAD83
Quad Name / ITM: Dillingham A-7
AWC Stream #:
Stream Name: Seven Sisters Creek Middle Fork tributary

Elevation:

Site Comments: Stream and Watershed name changed to local name on 11.24.21

Survey Date: Sep 20, 2012

Survey SWA12-DIL14

Project Supervisor: Gillian O'Doherty, Alaska Department of Fish and Game — Anchorage, AK
Observers: Gillian O'Doherty, Mark Eisenman

Overall Fish Passage Rating: Green

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:


Site Observations:

  1. Culvert gradient gray
  2. Mechanical damage or joints parting

Comments: Outlet flare rusted through and detaching. Gradient slightly gray but pipe good otherwise so rated green.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Green
 
Length(ft): 112.6
Inlet Type: Flared Inlet
Outlet Type: Flared Inlet
Corrugation Depth(in.): 0.33
Corrugation Width(in.): 2.66
Condition Rating(1-5): 3
Approach Angle: 12.0
Sedimentation At Inlet: Yes
Inlet Substrate: Gravel
Outlet Substrate: None
InletOutlet
Width(ft):5.0 4.9
Height(ft):4.0 4.3
Apron Length(ft):
Water Depth(ft): 0.89
Rustline Height(ft):
Substrate Depth(ft):1.0 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 1.23
Culvert Gradient: 1.03%
Max Slope:
Max Slope Length:
 

Comments: Aprons not measured because covered in substrate/rocks. Outlet apron also rusted through. Rust line not measured because of staining.
  Culvert Observations:
  1. Culvert gradient gray
  2. Mechanical damage or joints parting

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:GravelGravel
Subdominant:
Stream Slope(deg.):1.27
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Upstream ordinary high water 61.0 3.20
Upstream ordinary high water 89.0 3.00
Upstream ordinary high water 120.0 6.00

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Road Elev 97.24
D/S Thalweg 0.00 82.10
D/S Water Surface Elev 0.00 82.50
D/S Water Surface Elev 23.00 82.50
D/S Thalweg (where natural channel starts) 23.00 82.07
Outlet Invert (on pipe) 40.00 81.85
D/S Water Surface Elev 40.00 82.74
Outlet Culvert Top 40.00 86.42
Inlet Culvert Top 152.60 87.58
U/S Water Surface Elev 152.60 83.91
Inlet Culvert Invert (substrate) 152.60 83.52
U/S Thalweg (top of inlet riffle) 163.60 83.77
U/S Water Surface Elev 163.60 84.05
U/S Water Surface Elev (sg) 188.60 84.16
U/S Grade Ctrl (Thalweg) 188.60 83.20
U/S Grade Ctrl (Thalweg) 267.60 84.64
U/S Water Surface Elev (sg) 267.60 85.16

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: No traps set, no fish observed.

Fish Observations

No fish observations occurred during this survey.

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