Fish Passage Site 50101630

Coordinates (dec. deg.): 64.58594°, -165.28039°
Legal Description: K010S033W28
Region: Arctic
Road Name: Kougarok Road

Datum: NAD83
Quad Name / ITM: Nome C-1
AWC Stream #:
Stream Name: Dexter Creek

Elevation:

Site Comments: Mile 8.6. Located just N of intersection with Dexter Pass Road. Nome River is 300' d/s of outlet.

Survey Date: Oct 10, 2005

Survey SEW05-KR42

Project Supervisor: Dave Ryland,
Observers: Dave Ryland, Jason Cheney

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools: Yes
Construction Year:


Site Observations:

  1. Outfall height red
  2. Culvert gradient gray
  3. Constriction ratio red

Comments: None

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Structural steel plate) Fish Passage Rating: Red
 
Length(ft): 108.8
Inlet Type: Flush
Outlet Type: Flush
Corrugation Depth(in.): 2.0
Corrugation Width(in.): 6.0
Condition Rating(1-5): 4
Approach Angle: 9.0
Sedimentation At Inlet: Yes
Inlet Substrate: None
Outlet Substrate: None
InletOutlet
Width(ft):10.0
Height(ft):10.1
Apron Length(ft):
Water Depth(ft): 0.3
Rustline Height(ft):1.1
Substrate Depth(ft):0.0 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Embedded Depth(ft): 0.0
Outfall Height: 1.13
Outfall Type: Fish Passage Structue
Constriction Ratio: 0.36
Culvert Gradient: 1.56%
Max Slope:
Max Slope Length:
 

Comments: Rocks below outlet cause cascade pool effect directly in front of outlet.
  Culvert Observations:
  1. Outfall height red
  2. Culvert gradient gray
  3. Constriction ratio red

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:GravelGravel
Subdominant:GravelGravel
Stream Slope(deg.):
Stream Flow Stage:
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Downstream ordinary high water 87.0 21.50
Downstream ordinary high water 126.0 21.50
Upstream bank full 75.0 46.00
Upstream bank full 100.0 38.00
Upstream bank full 125.0 61.00
Upstream bank full 150.0 53.00
Upstream bed width 75.0 7.70
Upstream bed width 100.0 6.00
Upstream bed width 125.0 13.00
Upstream bed width 150.0 12.00
Upstream ordinary high water 75.0 39.00
Upstream ordinary high water 100.0 19.00
Upstream ordinary high water 125.0 20.50
Upstream ordinary high water 150.0 34.00

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Max Pool Depth 1.60
Outlet Pool Water Elev 89.83
D/S Grade Ctrl (Thalweg) 0.00 126.0 87.71
D/S Grade Ctrl (Thalweg) 39.00 87.0 88.28
D/S Tailcrest or 1st Thalweg 101.00 25.0 89.46
OHW (Outlet Tailcrest) 101.00 25.0 89.73
D/S Thalweg 121.00 5.0 1.00
Outlet Invert 1 126.00 0.0 90.66
Road Elev 180.00 110.86
U/S Grade Ctrl (Thalweg) 213.50 -20.5 91.05
Inlet Culvert Invert 1 234.00 0.0 92.36
U/S Grade Ctrl (Thalweg) 243.00 9.0 93.37
U/S Thalweg 254.00 20.0 92.36
U/S Thalweg 309.00 75.0 93.19
U/S Thalweg 384.00 150.0 94.08

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: Not Recorded (A)
Channel Type: Main Channel (>50% of water flow)
Comments: Culvert outlet pool, no other info recorded
 
Gear Type: Visual Observation, Ground (B)
Comments: location recorded as "d/s of outlet pool"

Fish Observations

Species: juvenile coho salmon Life History: Anadromous
Total Fish Observed: 2 Fish Measured: 1 Fork Lengths (mm) Min: 75 Max: 75 Mean: 75
Collected/Observed by Gear Type: Downstream Visual Observation, Ground (1)  Downstream Not Recorded (1)  
 
Species: Dolly Varden Life History: Unknown
Total Fish Observed: 7 Fish Measured: Fork Lengths (mm) Min: Max: Mean:
Collected/Observed by Gear Type: Downstream Visual Observation, Ground (7)  

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