Fish Passage Site 10103600

Coordinates (dec. deg.): 55.72224°, -132.93346°
Legal Description: C071S081E12
Region: Southeast
Road Name: North Prince of Wales Road

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

Elevation:

Site Comments: None

Survey Date: Jul 18, 2017

Survey SEA17-NPW34

Observers: Elizabeth Flory, Kelly Petty

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:


Site Observations:

  1. Outfall height red
  2. Culvert gradient red

Comments: Milepost 20. Upstream has gravelly pool then large wood cascades at 30ft from inlet. More cascades above, steep. Climbs to road surface height within 50ft of inlet. Downstream has 4ft high large woody debris step then goes under big logging slash. Hose pipe instream.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Red
 
Length(ft): 82.6
Inlet Type: Mitered
Outlet Type: Mitered
Corrugation Depth(in.): 2.0
Corrugation Width(in.): 3.3
Condition Rating(1-5): 3
Approach Angle: 50.0
Sedimentation At Inlet: Yes
Inlet Substrate: None
Outlet Substrate: None
InletOutlet
Width(ft):3.1 3.1
Height(ft):3.0 2.67
Apron Length(ft):
Water Depth(ft): 0.5
Rustline Height(ft):
Substrate Depth(ft):
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 2.15
Outfall Type: Free Fall on To Rip Rap
Constriction Ratio: 1.4
Culvert Gradient: 3.03%
Max Slope:
Max Slope Length:
 

Comments: Approach angle taken at bend in stream? See photos. Unsure on substrate at inverts too. Top of culvert length 70.6'.
  Culvert Observations:
  1. Outfall height red
  2. Culvert gradient red

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:GravelGravel
Subdominant:Boulder
Stream Slope(deg.):
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Upstream ordinary high water 20.0 2.11
Upstream ordinary high water 40.0 3.00
Upstream ordinary high water 60.0 1.50

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Road Elev 106.00
D/S Grade Ctrl (Thalweg) 0.00 91.65
D/S Water Surface Elev 0.00 92.09
D/S Water Surface Elev 9.00 92.25
D/S Grade Ctrl (Thalweg) (trap pool) 9.00 91.32
D/S Grade Ctrl (Thalweg) (pool) 17.00 92.58
D/S Water Surface Elev 17.00 92.97
Outlet Invert (on pipe) 24.00 94.62
D/S Water Surface Elev 24.00 95.12
Outlet Culvert Top 30.00 97.68
Inlet Culvert Top 100.60 100.00
Inlet Culvert Invert (on pipe) 106.60 97.12
U/S Water Surface Elev 106.60 97.36
U/S Water Surface Elev 111.60 97.45
U/S Grade Ctrl (Thalweg) (gravel bar) 111.60 97.06
U/S Grade Ctrl (Thalweg) (Large woody debris cascade) 131.60 102.53
U/S Water Surface Elev 131.60 103.47

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: Minnow Trap (A) Trap Duration(h): 1.3
Comments: no fish
 
Gear Type: Minnow Trap (B) Trap Duration(h): 1.3
Comments: no fish

Fish Observations

No fish observations occurred during this survey.

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