Fish Passage Site 20303808

Coordinates (dec. deg.): 60.48749°, -149.98402°
Legal Description: S005N004W28
Region: South Central
Road Name: Sterling Highway

Datum: NAD83
Quad Name / ITM: Seward B-8
AWC Stream #: 244-30-10010-2157
Stream Name: Unnamed

Elevation:

Site Comments: None

Survey Date: Aug 30, 2018

Survey KEN18-UTSH1

Observers: Maggie Harings, Alice Main

Overall Fish Passage Rating: Green

Tidal: No
Backwatered: Yes

Step Pools: No
Construction Year:


Site Observations:

  1. Sediment accumulation
  2. Culvert is poorly aligned

Comments: Culvert assessment and photos submitted by the Kenai Watershed Forum. Inlet and outlet water surface elevations within margin of error, site is backwatered and embedded. Culvert gradient within 1% of stream gradient. Site is Green. Lots of silt sediment and organics throughout crossing. Small juvenile fish observed downstream of culvert, but none caught.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Green
 
Length(ft): 63.74
Inlet Type: Mitered
Outlet Type: Mitered
Corrugation Depth(in.): 1.0
Corrugation Width(in.): 3.0
Condition Rating(1-5): 3
Approach Angle:
Sedimentation At Inlet: Yes
Inlet Substrate: Gravel
Outlet Substrate: Silt/Clay
InletOutlet
Width(ft):4.9 4.65
Height(ft):3.4 3.95
Apron Length(ft):
Water Depth(ft): 0.17
Rustline Height(ft):0.35
Substrate Depth(ft):1.5 1.05
Backwatered?: Yes
Baffles Present: No
Embedded?: Yes
Embedded Depth(ft): 1.0
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 1.11
Culvert Gradient: 0.88%
Max Slope:
Max Slope Length:
 

Comments: Some minor damage at outlet. Not noted if culvert length is full bottom length or top of culvert length.
  Culvert Observations:
  1. Sediment accumulation
  2. Culvert is poorly aligned

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:OrganicGravel
Subdominant:GravelSilt/Clay
Stream Slope(deg.):0.65
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Downstream ordinary high water 35.0 5.67
Downstream ordinary high water 50.0 7.10
Downstream ordinary high water 59.0 7.33
Upstream ordinary high water 18.0 6.70
Upstream ordinary high water 27.0 2.90
Upstream ordinary high water 33.0 3.30
Upstream ordinary high water 53.0 4.60

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Road Elev 103.95
D/S Grade Ctrl (Thalweg) 25.00 97.18
D/S Water Surface Elev 25.00 97.20
D/S Water Surface Elev 32.00 97.22
D/S Thalweg (max pool depth) 32.00 96.68
D/S Thalweg 47.00 96.40
D/S Water Surface Elev 47.00 97.20
D/S Tailcrest or 1st Thalweg 59.50 96.68
D/S Water Surface Elev 59.50 97.19
Outlet Pool Water Elev 69.00 97.24
Max Pool Depth 69.00 96.35
Outlet Culvert Top 80.00 99.89
D/S Water Surface Elev 80.00 97.25
Outlet Invert (on substrate) 80.00 97.08
Inlet Culvert Invert (on substrate) 143.70 97.09
U/S Water Surface Elev 143.70 97.27
Inlet Culvert Top 143.70 100.45
U/S Water Surface Elev 149.70 97.41
U/S Thalweg (1st resting) 149.70 96.66
U/S Grade Ctrl (Thalweg) 156.70 96.92
U/S Water Surface Elev 156.70 97.42
U/S Water Surface Elev 199.70 97.68
U/S Grade Ctrl (Thalweg) 199.70 97.23

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): 1.6666666
Comments: Trap set about 35 feet upstream.
 
Gear Type: Minnow Trap (B) Trap Duration(h): 2.0
Comments: Trap set about 25 feet downstream

Fish Observations

Species: juvenile coho salmon Life History: Anadromous
Total Fish Observed: 2 Fish Measured: 2 Fork Lengths (mm) Min: 56 Max: 76 Mean: 66
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: 86 Max: 102 Mean: 94
Collected/Observed by Gear Type: Upstream Minnow Trap (2)  
 
Species: sculpin-unspecified Life History: Resident
Total Fish Observed: 1 Fish Measured: 1 Fork Lengths (mm) Min: 77 Max: 77 Mean: 77
Collected/Observed by Gear Type: Upstream Minnow Trap (1)  

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