Fish Passage Site 20103762

Coordinates (dec. deg.): 62.02682°, -146.69510°
Legal Description: C003N008W21
Region: South Central
Road Name: Glenn Highway

Datum: NAD83
Quad Name / ITM: Gulkana A-6
AWC Stream #:
Stream Name: Cache Creek

Elevation:

Site Comments: Creek drains Snowshoe Lake upstream.

Survey Date: Sep 09, 2016

Survey CRWP17-Glen5

Observers: Kirsti Jurica, Hoots Witsoe

Overall Fish Passage Rating: Green

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:


Site Observations:

  1. Beaver Activity

Comments: Culvert assessment performed and submitted by the Copper River Watershed Project. Deep palustrine channel. Beaver dam in culvert. Numerous Arctic grayling caught upstream.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Structural steel plate) Fish Passage Rating: Green
 
Length(ft): 126.1
Inlet Type: Mitered
Outlet Type: Mitered
Corrugation Depth(in.): 2.0
Corrugation Width(in.): 6.0
Condition Rating(1-5): 4
Approach Angle: 2.0
Sedimentation At Inlet: No
Inlet Substrate: None
Outlet Substrate: Cobble
InletOutlet
Width(ft):14.75 12.9
Height(ft):15.16 15.6
Apron Length(ft):
Water Depth(ft): 1.75
Rustline Height(ft):2.7
Substrate Depth(ft):0.0 1.2
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 1.9
Culvert Gradient: 0.30%
Max Slope:
Max Slope Length:
 

Comments: Beaver dam inside of culvert near inlet. Water surface gradient through culvert 1.29%, substrate gradient on bottom of culvert is .62. Culvert gradient calculated using top of pipe elevations.
  Culvert Observations:
  1. Culvert gradient gray
  2. Beaver Activity

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:Silt/ClayGravel
Subdominant:GravelCobble
Stream Slope(deg.):0.5
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Downstream ordinary high water 5.90
Downstream ordinary high water 7.70
Downstream ordinary high water 7.80
Upstream ordinary high water 7.90
Upstream ordinary high water 9.80
Upstream ordinary high water 5.40

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Road Elev 112.69
D/S Grade Ctrl (Thalweg) 0.00 88.26
D/S Water Surface Elev 0.00 89.96
D/S Thalweg (bottom of beaver dam) 115.00 90.77
D/S Water Surface Elev 115.00 91.72
Max Pool Depth 127.00 90.48
Outlet Pool Water Elev 127.00 93.27
D/S Water Surface Elev 150.00 93.27
Outlet Invert (on substrate) 150.00 91.52
Outlet Culvert Top (estimated distance) 158.00 107.12
Inlet Culvert Top (estimated distance) 268.00 107.46
U/S Water Surface Elev 276.00 94.90
Inlet Culvert Invert 276.00 92.30
U/S Grade Ctrl (Thalweg) 326.00 92.11
U/S Water Surface Elev 326.00 94.91
U/S Water Surface Elev 401.00 95.08
U/S Grade Ctrl (Thalweg) 401.00 91.08

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: Minnow Trap (A) Trap Duration(h): 15.0
Comments: No fish caught
 
Gear Type: Minnow Trap (B) Trap Duration(h): 15.0
 
Gear Type: Minnow Trap (C) Trap Duration(h): 15.0
Comments: No fish caught
 
Gear Type: Minnow Trap (D) Trap Duration(h): 15.0
Comments: No fish caught
 
Gear Type: Minnow Trap (E) Trap Duration(h): 15.0

Fish Observations

Species: juvenile Arctic grayling Life History: Resident
Total Fish Observed: 3 Fish Measured: 3 Fork Lengths (mm) Min: 95 Max: 105 Mean: 98
Collected/Observed by Gear Type: Not Recorded Minnow Trap (1)  Not Recorded Minnow Trap (2)  

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