Fish Passage Site 30303073

Coordinates (dec. deg.): 59.04302°, -158.54381°
Legal Description: S013S056W13
Region: Southwest
Road Name: Lupine Drive

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 20, 2012

Survey SWA12-DIL11

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

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools: No
Construction Year: 1999


Site Observations:

  1. Culvert gradient gray
  2. Inlet perch
  3. Mechanical damage or joints parting
  4. Improper bedding
  5. Damage associated with ice problems
  6. Compound gradient in pipe

Comments: Substrate at outlet is riprap. Couldn't get good depth measurement. Large frost heave at inlet. Center is heaved up several feet, miter is above stream bed. Didn't measure rust line. Adult salmon present in pipe ( n = 2) and downstream (n = 1); probably chum. Hard to tell shape b/c of inlet, but think it is PA. Outlet channel lined with riprap.

Culvert Measurements

ID: 1 Structure Type: Pipe-arch (Structural steel plate) Fish Passage Rating: Red
 
Length(ft): 101.25
Inlet Type: Mitered
Outlet Type: Projecting
Corrugation Depth(in.): 2.0
Corrugation Width(in.): 6.0
Condition Rating(1-5): 1
Approach Angle: 0.0
Sedimentation At Inlet: Yes
Inlet Substrate: None
Outlet Substrate: Gravel
InletOutlet
Width(ft):11.0 12.0
Height(ft):6.6 6.2
Apron Length(ft):
Water Depth(ft): 1.44
Rustline Height(ft):
Substrate Depth(ft):0.0 2.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 0.99
Culvert Gradient: 1.97%
Max Slope: 8.0
Max Slope Length: 11.0
 

Comments: Top of miter length 80.7. Total length entered above. Substrate depth at outlet is minimum 2 feet.
  Culvert Observations:
  1. Culvert gradient gray
  2. Inlet perch
  3. Mechanical damage or joints parting
  4. Improper bedding
  5. Damage associated with ice problems
  6. Compound gradient in pipe

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:Silt/ClayGravel
Subdominant:GravelGravel
Stream Slope(deg.):
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Downstream ordinary high water 10.00
Downstream ordinary high water 11.30
Downstream ordinary high water 12.00

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Road Elev 107.29
D/S Thalweg (middle of riffle) 0.00 95.90
D/S Water Surface Elev 0.00 97.07
D/S Water Surface Elev 70.00 97.57
D/S Thalweg (end of riprap) 70.00 96.89
D/S Tailcrest or 1st Thalweg 94.00 97.01
D/S Water Surface Elev 94.00 98.33
D/S Water Surface Elev 100.00 98.57
Outlet Culvert Top 100.00 103.91
Outlet Invert (substrate) 100.00 97.13
Inlet Culvert Top 180.70 105.50
U/S Thalweg (thalweg at miter) 180.70 98.94
U/S Water Surface Elev 180.70 99.46
U/S Thalweg (pipe below miter) 180.70 99.73
U/S Water Surface Elev 180.70 99.86
U/S Water Surface Elev 191.70 100.34
U/S Thalweg (middle of miter) 191.70 98.83
U/S Water Surface Elev 201.70 100.40
Inlet Culvert Invert (end of miter; on substrate.) 201.70 98.32
U/S Thalweg 220.70 97.03
U/S Water Surface Elev 220.70 100.40

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. Adult salmon (2) observed in pipe. Likely chum.
 
Gear Type: Visual Observation, Ground (B)
Comments: No traps. Adult salmon (1) observed downstream. Likely chum.

Fish Observations

No fish observations occurred during this survey.

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