Fish Passage Site 30203270

Coordinates (dec. deg.): 58.71245°, -156.74179°
Legal Description: S017S045W08
Region: Southwest
Road Name: Alaska Peninsula Highway

Datum: NAD83
Quad Name / ITM: Naknek C-3
AWC Stream #:
Stream Name: Unnamed Creek

Elevation:

Site Comments: None

Survey Date: Oct 01, 2013

Survey SWA12-KIS03

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:


Site Observations:

  1. Culvert gradient red
  2. Mechanical damage or joints parting
  3. Structural Problem
  4. Culvert sagging in middle

Comments: Upstream is a E-type channel, not very wide but up to 3 feet deep in places. Unable to see through culvert. Downstream creek runs swiftly over cobble for about 200 feet before turning back into a small E-type channel. No fish trapped too cold, no fish observed at site. Upstream habitat looks good for rearing.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Red
 
Length(ft): 85.5
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 2.75
Condition Rating(1-5): 2
Approach Angle:
Sedimentation At Inlet: Yes
Inlet Substrate: Gravel
Outlet Substrate: None
InletOutlet
Width(ft):3.0 3.0
Height(ft):2.95 3.0
Apron Length(ft):
Water Depth(ft): 1.06
Rustline Height(ft):
Substrate Depth(ft):0.05 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 1.84
Culvert Gradient: 1.12%
Max Slope:
Max Slope Length:
 

Comments: Culvert length taken with long tape over road (not very accurate, but appoximate). Water surfaces nearly equal on both sides of culvert, but unable to determine if there is free passage inside barrel due to sagging.
  Culvert Observations:
  1. Culvert gradient red
  2. Mechanical damage or joints parting
  3. Material inadequate for designed use
  4. Culvert sagging in middle

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:OrganicSand
Subdominant:Silt/ClayGravel
Stream Slope(deg.):
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Upstream ordinary high water 44.0 1.90
Upstream ordinary high water 61.0 1.40
Upstream ordinary high water 93.0 1.60

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Road Elev 108.87
D/S Grade Ctrl (Thalweg) 0.00 93.87
D/S Water Surface Elev 0.00 94.34
D/S Tailcrest or 1st Thalweg (Kind of a TWC at this flow) 26.00 94.92
D/S Water Surface Elev 26.00 95.42
Max Pool Depth 30.00 94.30
Outlet Pool Water Elev 30.00 95.55
D/S Water Surface Elev 31.00 95.54
Outlet Culvert Top 31.00 97.45
Outlet Invert (On pipe) 31.00 94.48
U/S Water Surface Elev 106.50 95.52
Inlet Culvert Invert (On pipe) 106.50 93.52
Inlet Culvert Top 106.50 96.36
U/S Water Surface Elev 116.50 95.55
U/S Thalweg 116.50 94.19

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

No fish sampling occurred during this survey.

Fish Observations

No fish observations occurred during this survey.

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