Fish Passage Site 30303067

Coordinates (dec. deg.): 59.19043°, -158.78955°
Legal Description: S011S056W30
Region: Southwest
Road Name: Snake Lake Road

Datum: NAD83
Quad Name / ITM: Dillingham A-8
AWC Stream #:
Stream Name: Snake River tributary

Elevation:

Site Comments: None

Survey Date: Sep 19, 2012

Survey SWA12-DIL05

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

Overall Fish Passage Rating: Gray

Tidal: No
Backwatered: Maybe

Step Pools: No
Construction Year:


Site Observations:

  1. Constriction ratio gray

Comments: C1 and C2 rust lines under water approximately 6 inches. Stream tail water control is higher than inverts but does not backwater the culvert at current water levels.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Gray
 
Length(ft): 40.3
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 2.75
Condition Rating(1-5): 3
Approach Angle: 10.0
Sedimentation At Inlet: Yes
Inlet Substrate: None
Outlet Substrate: None
InletOutlet
Width(ft):4.9 4.9
Height(ft):5.0 5.0
Apron Length(ft):
Water Depth(ft): 2.96
Rustline Height(ft):
Substrate Depth(ft):0.0 0.0
Backwatered?: Maybe
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 0.54
Culvert Gradient: 0.32%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Constriction ratio gray
ID: 2 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Gray
 
Length(ft): 39.8
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 2.75
Condition Rating(1-5): 3
Approach Angle: 10.0
Sedimentation At Inlet: Yes
Inlet Substrate: None
Outlet Substrate: None
InletOutlet
Width(ft):6.0 6.0
Height(ft):6.0 6.0
Apron Length(ft):
Water Depth(ft): 2.8
Rustline Height(ft):
Substrate Depth(ft):0.0 0.0
Backwatered?: Maybe
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 0.54
Culvert Gradient: -0.23%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Constriction ratio gray

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:GravelGravel
Subdominant:SandSand
Stream Slope(deg.):
Stream Flow Stage:High
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Downstream ordinary high water 13.00
Downstream ordinary high water 12.10

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Road Elev 100.60
D/S Tailcrest or 1st Thalweg (tailwater control) 0.00 94.69
D/S Water Surface Elev 0.00 96.69
D/S Water Surface Elev 1 38.00 96.70
D/S Water Surface Elev 2 38.00 96.70
Outlet Invert (on pipe) 1 38.00 93.74
Outlet Invert (on pipe) 2 38.00 93.90
Outlet Culvert Top 1 38.00 98.77
Outlet Culvert Top 2 38.00 100.00
Inlet Culvert Top 2 77.80 99.92
Inlet Culvert Invert (on pipe) 2 77.80 93.81
U/S Water Surface Elev 2 77.80 96.74
U/S Water Surface Elev 1 78.30 96.76
Inlet Culvert Invert (on pipe) 1 78.30 93.87
Inlet Culvert Top 1 78.30 98.82
U/S Grade Ctrl (Thalweg) 96.30 93.26
U/S Water Surface Elev (water above ohw) 96.30 96.80

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 fish observed or trapped.

Fish Observations

No fish observations occurred during this survey.

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