Fish Passage Site 30303077

Coordinates (dec. deg.): 59.04982°, -158.56984°
Legal Description: S013S056W14
Region: Southwest
Road Name: Aleknagik Lake Road

Datum: NAD83
Quad Name / ITM: Dillingham A-7
AWC Stream #: 325-30-10100-2021
Stream Name: Seven Sisters Creek

Elevation:

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

Survey Date: Sep 21, 2012

Survey SWA12-DIL15

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: Yes

Step Pools: No
Construction Year:


Comments: None

Culvert Measurements

ID: 1 Structure Type: Pipe-arch (Structural steel plate) Fish Passage Rating: Green
 
Length(ft): 111.5
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 2.0
Corrugation Width(in.): 6.0
Condition Rating(1-5): 4
Approach Angle: 17.0
Sedimentation At Inlet: Yes
Inlet Substrate: None
Outlet Substrate: None
InletOutlet
Width(ft):7.0 7.0
Height(ft):5.1 5.1
Apron Length(ft):
Water Depth(ft): 1.66
Rustline Height(ft):2.0
Substrate Depth(ft):0.0 0.0
Backwatered?: Yes
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 0.95
Culvert Gradient: 0.70%
Max Slope:
Max Slope Length:

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:GravelGravel
Subdominant:Silt/ClaySand
Stream Slope(deg.):0.52
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Upstream ordinary high water 96.0 7.50
Upstream ordinary high water 133.0 8.00
Upstream ordinary high water 169.0 6.70

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Road Elev 100.00
D/S Grade Ctrl (Thalweg) (below island and around bend) 0.00 86.63
D/S Water Surface Elev 0.00 87.30
D/S Grade Ctrl (Thalweg) (below island) 36.00 86.99
D/S Water Surface Elev 36.00 87.63
D/S Water Surface Elev 63.00 88.14
D/S Tailcrest or 1st Thalweg (tailwater control) 63.00 87.38
Max Pool Depth 77.00 86.40
D/S Water Surface Elev (tailwater surface) 77.00 88.28
D/S Water Surface Elev 82.00 88.28
Outlet Invert (on pipe) 82.00 86.62
Outlet Culvert Top 82.00 91.94
Inlet Culvert Top 193.50 92.16
Inlet Culvert Invert (on pipe) 193.50 85.84
U/S Water Surface Elev 193.50 87.33
U/S Water Surface Elev 212.50 88.36
U/S Grade Ctrl (Thalweg) (pipe's gravel bar) 212.50 87.73
U/S Grade Ctrl (Thalweg) (old beaver dam) 228.50 87.67
U/S Water Surface Elev 228.50 88.45
U/S Grade Ctrl (Thalweg) (stream grade) 262.50 87.82
U/S Water Surface Elev 262.50 88.56
U/S Water Surface Elev 321.50 89.12
U/S Grade Ctrl (Thalweg) 321.50 88.47
U/S Water Surface Elev (stream grade) 409.50 89.32
U/S Grade Ctrl (Thalweg) 409.50 88.93

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