Fish Passage Site 40601681

Coordinates (dec. deg.): 67.51962°, -149.84619°
Legal Description: F031N010W08
Region: Interior
Road Name: Dalton Highway

Datum: NAD83
Quad Name / ITM: Chandalar C-6
AWC Stream #:
Stream Name: Linda Creek

Elevation:

Site Comments: None

Survey Date: Aug 23, 2010

Survey EDS10-DAL21

Observers: Gillian O'Doherty, Ben Histand

Overall Fish Passage Rating: Green

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:


Site Observations:

  1. None of this type

Comments: Nice stream-sim culvert; functions as open bottom or embedded, think its flat bottom oval but hard to tell; stream widths taken in little canyon d/s - only somewhat reliable. Env atlas says sculpin & grayling;

Culvert Measurements

ID: 1 Structure Type: Flat Bottom Oval Pipe (Structural steel plate) Fish Passage Rating: Green
 
Length(ft): 119.7
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 2.0
Corrugation Width(in.): 6.0
Condition Rating(1-5): 4
Approach Angle: 14.0
Sedimentation At Inlet: No
Inlet Substrate: Cobble
Outlet Substrate: Cobble
InletOutlet
Width(ft):14.5 14.5
Height(ft):12.0 10.5
Apron Length(ft):0.0 0.0
Water Depth(ft): 0.7
Rustline Height(ft):1.8
Substrate Depth(ft):
Backwatered?: No
Baffles Present: No
Embedded?: Yes
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 1.09
Culvert Gradient: 2.18%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. None of this type

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:CobbleCobble
Subdominant:GravelGravel
Stream Slope(deg.):1.67
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Downstream ordinary high water 58.0 16.00
Downstream ordinary high water 101.0 14.50
Downstream ordinary high water 241.0 17.00

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
D/S Water Surface Elev 0.00 77.39
D/S Grade Ctrl (Thalweg) (point in Tweg on riffle d/s) 0.00 76.95
D/S Water Surface Elev (TWS) 18.00 77.87
D/S Water Surface Elev (ws @ outlet) 20.00 77.93
Outlet Invert (on subs - embedded) 20.00 77.23
Outlet Culvert Top 20.00 88.37
U/S Water Surface Elev (ws @ inlet) 140.00 90.98
Inlet Culvert Top 140.00 90.98
Inlet Culvert Invert 140.00 78.22
U/S Grade Ctrl (Thalweg) (above rip-rap - begin u/s ws profile) 174.00 79.33
U/S Water Surface Elev 174.00 79.77
U/S Grade Ctrl (Thalweg) (head of riffle) 239.00 81.21
U/S Water Surface Elev 239.00 81.57
U/S Grade Ctrl (Thalweg) (head of riffle) 360.00 82.37
U/S Water Surface Elev 360.00 82.90
U/S Grade Ctrl (Thalweg) (grade point) 407.00 83.25
U/S Water Surface Elev 407.00 83.64
U/S Grade Ctrl (Thalweg) (head of riffle) 459.00 83.83
U/S Water Surface Elev 459.00 84.53

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: Grayling and sculpin observed upstream.

Fish Observations

Species: Arctic grayling Life History: Resident
Total Fish Observed: 1 Fish Measured: 0 Fork Lengths (mm) Min: Max: Mean:
Collected/Observed by Gear Type: Upstream Visual Observation, Ground (1)  
 
Species: sculpin-unspecified Life History: Unknown
Total Fish Observed: 1 Fish Measured: Fork Lengths (mm) Min: Max: Mean:
Collected/Observed by Gear Type: Upstream Visual Observation, Ground (1)  

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