Fish Passage Site 20101838

Coordinates (dec. deg.): 61.45581°, -143.79076°
Legal Description: C005S009E09
Region: South Central
Road Name: McCarthy Road

Datum: NAD83
Quad Name / ITM: Mc Carthy B-8
AWC Stream #:
Stream Name: Chokosna Lake Complex outlet

Elevation:

Site Comments: Mile 25.9 McCarthy Rd; Chokoshna Lake Complex outlet

Multiple surveys have been conducted at this site — click on the drop down
arrow to the right of the survey date below to choose a different report for this site.

Survey UPDATE-MAC15

Project Supervisor: Gillian O'Doherty, ADFG
Observers: Gillian O'Doherty

Overall Fish Passage Rating: Green

Tidal: No
Backwatered: Yes

Step Pools: No
Construction Year:


Site Observations:

  1. Culvert is poorly aligned

Comments: This crossing was replaced in 2012 and has been resurveyed by the Copper River Watershed Project on 9/12/14. Site #20101838 and site # 20101837 were combined into a single crossing at time of replacement and all data is now associated with site 20101838 and can be viewed as part of this report. 20101838 was originally a single 3' culvert located at 61.45581, -143.79076 and 20101837 was originally 2 x 24" culverts located at 61.45555, -143.78851. Adult Coho observed upstream and downstream of crossing and juvenile Coho captured upstream and downstream at time of new survey.

Culvert Measurements

ID: 1 Structure Type: Box culvert (Structural aluminum plate) Fish Passage Rating: Green
 
Length(ft): 60.2
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 2.5
Corrugation Width(in.): 9.5
Condition Rating(1-5): 5
Approach Angle: 70.0
Sedimentation At Inlet: Yes
Inlet Substrate: Cobble
Outlet Substrate: Cobble
InletOutlet
Width(ft):9.83 9.8
Height(ft):5.49 4.86
Apron Length(ft):
Water Depth(ft): 3.56
Rustline Height(ft):
Substrate Depth(ft):0.4 1.1
Backwatered?: Yes
Baffles Present: Yes
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio:
Culvert Gradient: 2.23%
Max Slope:
Max Slope Length:
 

Comments: 1.95 foot baffle located at inverts. Large angular rocks placed in culvert. Stream gradient taken with clinometer. Stream gradient at great than 1%.

  Culvert Observations:
  1. Culvert is poorly aligned

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:Silt/ClayGravel
Subdominant:GravelSilt/Clay
Stream Slope(deg.):1
Stream Flow Stage:Medium

No stream width data available.

Elevations

Locator ID Culvert
Number
River
Distance (ft)1
Distance From
Crossing (ft)2
Relative
Elevation (ft)
Road Elev 101.33
D/S Tailcrest or 1st Thalweg 0.00 92.19
D/S Water Surface Elev 0.00 96.79
Outlet Invert (On substrate) 111.40 93.26
D/S Water Surface Elev 111.40 96.82
Outlet Culvert Top 111.40 98.12
Inlet Culvert Top 171.60 99.46
Inlet Culvert Invert (On substrate) 171.60 93.97
U/S Water Surface Elev 171.60 96.82
U/S Grade Ctrl (Thalweg) (Ponding) 191.70 94.40
U/S Water Surface Elev 191.70 96.87
U/S Grade Ctrl (Thalweg) (Start of wetland channel) 349.10 93.12
U/S Water Surface Elev 349.10 96.94

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) Trap Duration(h): 0
Comments: Adult coho observed upstream and downstream of crossing.
 
Gear Type: Minnow Trap (B)
 
Gear Type: Minnow Trap (C)
 
Gear Type: Minnow Trap (D)
 
Gear Type: Minnow Trap (E)
 
Gear Type: Minnow Trap (F)
 
Gear Type: Minnow Trap (G)
 
Gear Type: Minnow Trap (H)
 
Gear Type: Minnow Trap (I)

Fish Observations

Species: adult coho salmon Life History: Anadromous
Total Fish Observed: 82 Fish Measured: 1 Fork Lengths (mm) Min: 0 Max: 0 Mean: 0
Collected/Observed by Gear Type: At Site Visual Observation, Ground (82)  
Comments: 46 counted upstream, 35 counted downstream from culvert
 
Species: juvenile coho salmon Life History:
Total Fish Observed: 20 Fish Measured: 15 Fork Lengths (mm) Min: 65 Max: 120 Mean: 102
Collected/Observed by Gear Type: Downstream Minnow Trap (3)  Downstream Minnow Trap (8)  Downstream Minnow Trap (3)  Upstream Minnow Trap (2)  Upstream Minnow Trap (1)  Upstream Minnow Trap (2)  Upstream Minnow Trap (1)  
 
Species: juvenile Dolly Varden Life History:
Total Fish Observed: 7 Fish Measured: 7 Fork Lengths (mm) Min: 110 Max: 155 Mean: 127
Collected/Observed by Gear Type: Downstream Minnow Trap (1)  Downstream Minnow Trap (1)  Downstream Minnow Trap (1)  Upstream Minnow Trap (1)  Upstream Minnow Trap (1)  Upstream Minnow Trap (1)  Upstream Minnow Trap (1)  
 
Species: adult slimy sculpin Life History:
Total Fish Observed: 3 Fish Measured: 3 Fork Lengths (mm) Min: 60 Max: 90 Mean: 78
Collected/Observed by Gear Type: Downstream Minnow Trap (1)  Upstream Minnow Trap (1)  Upstream Minnow Trap (1)  

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