Fish Passage Site 20203729

Coordinates (dec. deg.): 60.16084°, -149.41443°
Legal Description: S001N001W23
Region: South Central
Road Name: Seward Highway

Datum: NAD83
Quad Name / ITM: Seward A-7
AWC Stream #:
Stream Name: Unnamed

Elevation:

Site Comments: AWC stream 31-30-10080-2010-3031-4017 is directly downstream from outlet.

Survey Date: Jul 14, 2017

Survey KEN17-31_2007

Observers: Jeff Sires, Louis Mitchell, Luke Violette

Overall Fish Passage Rating: Green

Tidal: No
Backwatered: Yes

Step Pools: No
Construction Year:


Site Observations:

  1. Damage associated with ice problems
  2. Sediment accumulation
  3. Damage associated with ice problems

Comments: KWFRES_17_04. Culvert assessment and photographs submitted by Kenai Watershed Forum. Ponded upstream from inlet. Creek joins another creek directly downstream of outlet. Downstream creek is cataloged (AWC#31-30-10080-2010-3031-4017) for Coho salmon rearing. Lots of fish caught in upstream trap. Only a couple positively identified from photos. Water surfaces at inlet and outlet equal. Downstream tailwater control higher than inlet invert, water appears to be slow moving and backed up quite a ways from inlet. Site is backwatered and rated Green, though culvert does appear to be undersized for the creek.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Green
 
Length(ft): 81.9
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 2.5
Condition Rating(1-5): 3
Approach Angle:
Sedimentation At Inlet: Yes
Inlet Substrate: Silt/Clay
Outlet Substrate: Gravel
InletOutlet
Width(ft):2.0 2.0
Height(ft):0.66 2.0
Apron Length(ft):
Water Depth(ft): 0.75
Rustline Height(ft):1.25
Substrate Depth(ft):0.0 0.0
Backwatered?: Yes
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio:
Culvert Gradient: 0.19%
Max Slope:
Max Slope Length:
 

Comments: Inlet damaged.
  Culvert Observations:
  1. Damage associated with ice problems
  2. Sediment accumulation

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:Silt/ClayGravel
Subdominant:SandSand
Stream Slope(deg.):0.028
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Downstream ordinary high water 32.0 6.50
Downstream ordinary high water 60.0 6.25
Downstream ordinary high water 84.0 5.33
Upstream ordinary high water 50.0 13.50
Upstream ordinary high water 70.0 11.00
Upstream ordinary high water 90.0 10.00
Upstream ordinary high water 110.0 9.00

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Road Elev 101.55
D/S Thalweg 0.00 96.56
D/S Water Surface Elev 0.00 96.68
D/S Water Surface Elev 40.00 96.88
D/S Thalweg 40.00 96.32
D/S Thalweg 80.00 96.95
D/S Water Surface Elev 80.00 97.12
Outlet Pool Water Elev 98.00 97.39
Max Pool Depth 98.00 95.98
Outlet Invert (on pipe) 100.00 96.66
D/S Water Surface Elev 100.00 97.40
Outlet Culvert Top 100.00 98.67
U/S Water Surface Elev 181.90 97.40
Inlet Culvert Top (Damaged) 181.90 98.41
Inlet Culvert Invert (On pipe) 181.90 96.82
U/S Thalweg 192.90 96.12
U/S Water Surface Elev (stream gradient lower) 192.90 97.33
U/S Water Surface Elev (stream gradient upper) 301.90 97.36
U/S Thalweg 301.90 96.91

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): 1.0
Comments: Trap set about 52 feet downstream from culvert.
 
Gear Type: Minnow Trap (B) Trap Duration(h): 1.0
Comments: Trap set about 10 feet upstream from culvert. 35 addtiional salmonids caught but not photographed for positive ID, not added to individual species.

Fish Observations

Species: juvenile coho salmon Life History: Anadromous
Total Fish Observed: 2 Fish Measured: 2 Fork Lengths (mm) Min: 60 Max: 100 Mean: 80
Collected/Observed by Gear Type: Upstream Minnow Trap (2)  
 
Species: juvenile Dolly Varden Life History: Unknown
Total Fish Observed: 2 Fish Measured: 2 Fork Lengths (mm) Min: 80 Max: 90 Mean: 85
Collected/Observed by Gear Type: Upstream Minnow Trap (2)  
 
Species: juvenile Chinook salmon Life History: Anadromous
Total Fish Observed: 1 Fish Measured: 1 Fork Lengths (mm) Min: 100 Max: 100 Mean: 100
Collected/Observed by Gear Type: Upstream Minnow Trap (1)  
 
Species: threespine stickleback Life History: Unknown
Total Fish Observed: 1 Fish Measured: 1 Fork Lengths (mm) Min: 60 Max: 60 Mean: 60
Collected/Observed by Gear Type: Upstream Minnow Trap (1)  

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