Fish Passage Site 20203735

Coordinates (dec. deg.): 60.15431°, -149.42455°
Legal Description: S001N001W27
Region: South Central
Road Name: Old Exit Glacier Road

Datum: NAD83
Quad Name / ITM: Seward A-7
AWC Stream #: 231-30-10080-2010-3029-4015
Stream Name: Unnamed

Elevation:

Site Comments: Site is right before driveway for Creekside Cabins and creek runs alongside Creekside Cabins driveway downstream from crossing.

Survey Date: Aug 11, 2017

Survey KEN17-77_2007

Observers: Louis Mitchell, Luke Violette, Mary Richardson

Overall Fish Passage Rating: Gray

Tidal: No
Backwatered: Yes

Step Pools: No
Construction Year:


Site Observations:

  1. Constriction ratio red
  2. Road Fill (pushed off road by grader)
  3. Subsidence

Comments: KWFRES_17_26. Culvert assessment performed and submitted by the Kenai Watershed Forum. Two streams come together just upstream of inlet. Downstream grade control higher than culvert inlet invert elevation, water surfaces very close upstream and downstream of culvert, site is backwatered. Constriction based on downstream widths, since two stream converge upstream of culvert, but downstream also looks ditched. Water surface elevations equal between downstream pool water surface elevation and upstream pool water surface elevation, but unable to confirm that the culvert is not obstructed since inlet is submerged. Road fill also being pushed into creek. Water looks fairly slow moving around crossing site, but photos inconclusive. Site rated gray, but does meet criteria for being backwatered. Upstream stream gradient for inlet creek #1 is 0.58 on right hand side facing upstream (north creek). Upstream stream gradient for inlet creek #2 (south creek) is 0.21%.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Reinforced concrete) Fish Passage Rating: Gray
 
Length(ft): 24.66
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.):
Corrugation Width(in.):
Condition Rating(1-5): 2
Approach Angle:
Sedimentation At Inlet: Yes
Inlet Substrate: Gravel
Outlet Substrate: Cobble
InletOutlet
Width(ft):3.0 3.5
Height(ft):1.66 2.0
Apron Length(ft):
Water Depth(ft): 1.41
Rustline Height(ft):
Substrate Depth(ft):1.75 0.66
Backwatered?: Yes
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 0.43
Culvert Gradient: -2.35%
Max Slope:
Max Slope Length:
 

Comments: Substrate gradient through culvert 0.28%. Water surface flat though cuvlert. Culvert set at adverse angle
  Culvert Observations:
  1. Road Fill (pushed off road by grader)
  2. Constriction ratio red
  3. Subsidence

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:GravelCobble
Subdominant:CobbleGravel
Stream Slope(deg.):1.09
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Downstream ordinary high water 20.0 6.00
Downstream ordinary high water 40.0 6.50
Downstream ordinary high water 60.0 8.33

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Road Elev 100.65
D/S Thalweg 0.00 96.09
D/S Water Surface Elev 0.00 96.38
D/S Water Surface Elev 50.00 96.51
D/S Thalweg 50.00 95.71
D/S Water Surface Elev 70.00 97.05
D/S Grade Ctrl (Thalweg) 70.00 97.36
D/S Water Surface Elev 100.00 97.33
D/S Thalweg 100.00 96.99
D/S Grade Ctrl (Thalweg) 125.00 97.62
D/S Water Surface Elev 125.00 97.88
Outlet Pool Water Elev 144.00 97.95
Max Pool Depth 144.00 97.18
Outlet Invert 149.00 96.53
D/S Water Surface Elev 149.00 97.94
Outlet Culvert Top 149.00 98.53
Inlet Culvert Top 173.66 97.95
U/S Water Surface Elev 173.66 97.98
Inlet Culvert Invert 173.66 96.60
U/S Thalweg (upstream inlet pool) 178.66 96.65
U/S Water Surface Elev 178.66 97.95
U/S Water Surface Elev 194.66 97.93
U/S Thalweg (Upstream inlet stream #2) 194.66 97.39
U/S Thalweg (Upstream inlet stream #1) 199.66 97.07
U/S Water Surface Elev 199.66 97.86
U/S Water Surface Elev 214.66 98.06
U/S Thalweg 214.66 97.37
U/S Water Surface Elev 234.66 98.34
U/S Grade Ctrl (Thalweg) 234.66 97.93
U/S Water Surface Elev 239.66 97.87
U/S Thalweg 239.66 97.37
U/S Thalweg 249.66 97.86
U/S Water Surface Elev 249.66 98.33
U/S Water Surface Elev 264.66 98.41
U/S Thalweg 264.66 98.09
U/S Water Surface Elev 274.66 98.02
U/S Thalweg 274.66 98.04
U/S Water Surface Elev 274.66 98.39
U/S Thalweg 274.66 97.73

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): 1.5
Comments: Trap set about 60 feet upstream
 
Gear Type: Minnow Trap (B) Trap Duration(h): 1.5
Comments: Trap set about 100 feet downstream.

Fish Observations

Species: juvenile/adult Dolly Varden Life History: Unknown
Total Fish Observed: 1 Fish Measured: 1 Fork Lengths (mm) Min: 130 Max: 130 Mean: 130
Collected/Observed by Gear Type: Upstream Minnow Trap (1)  

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