Fish Passage Site 10103561

Coordinates (dec. deg.): 55.54942°, -133.03046°
Legal Description: C073S081E12
Region: Southeast
Road Name: Hollis Klawock Road

Datum: NAD83
Quad Name / ITM: Craig C-4
AWC Stream #: 103-60-10470-2031
Stream Name: Half Mile Creek

Elevation:

Site Comments: Near Mile post 10

Survey Date: Jul 27, 2017

Survey SEA17-HLK01

Observers: Elizabeth Flory, Kelly Petty

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:


Site Observations:

  1. Outfall height red
  2. Inlet perch
  3. Culvert gradient red

Comments: Big large woody debris downstream with big deep pools. Gravel bars upstream with some steep riffles. Big stream about 30 to 40 wide. Culvert 1 set high and has an inlet perch, Culvert 3 has a gravel bar infront of inlet.

Culvert Measurements

ID: 1 Structure Type: Pipe-arch (Structural steel plate) Fish Passage Rating: Red
 
Length(ft): 54.0
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 2.0
Corrugation Width(in.): 6.0
Condition Rating(1-5): 3
Approach Angle: 0.0
Sedimentation At Inlet: Yes
Inlet Substrate: None
Outlet Substrate: None
InletOutlet
Width(ft):9.3 9.5
Height(ft):6.3 6.3
Apron Length(ft):
Water Depth(ft): 0.25
Rustline Height(ft):2.5
Substrate Depth(ft):0.0 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.3
Outfall Type: Free Fall In To Pool
Constriction Ratio:
Culvert Gradient: 3.35%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Culvert gradient red
  2. Outfall height gray
  3. Inlet perch
ID: 2 Structure Type: Pipe-arch (Structural steel plate) Fish Passage Rating: Red
 
Length(ft): 54.2
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 2.0
Corrugation Width(in.): 6.0
Condition Rating(1-5): 3
Approach Angle: 0.0
Sedimentation At Inlet: Yes
Inlet Substrate: None
Outlet Substrate: None
InletOutlet
Width(ft):9.4 9.5
Height(ft):6.7 6.5
Apron Length(ft):
Water Depth(ft): 0.67
Rustline Height(ft):2.5
Substrate Depth(ft):0.0 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio:
Culvert Gradient: 2.05%
Max Slope:
Max Slope Length:
 

Comments: Gravel bar in front of culvert
  Culvert Observations:
  1. Culvert gradient red
ID: 3 Structure Type: Pipe-arch (Structural steel plate) Fish Passage Rating: Red
 
Length(ft): 54.0
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 2.0
Corrugation Width(in.): 6.0
Condition Rating(1-5): 3
Approach Angle: 0.0
Sedimentation At Inlet: Yes
Inlet Substrate: None
Outlet Substrate: None
InletOutlet
Width(ft):9.4 9.4
Height(ft):6.3 6.0
Apron Length(ft):
Water Depth(ft): 0.39
Rustline Height(ft):1.0
Substrate Depth(ft):0.0 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.67
Outfall Type: Free Fall In To Pool
Constriction Ratio:
Culvert Gradient: 3.07%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Culvert gradient red
  2. Outfall height red
ID: 4 Structure Type: Pipe-arch (Structural steel plate) Fish Passage Rating: Red
 
Length(ft): 55.6
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 2.0
Corrugation Width(in.): 6.0
Condition Rating(1-5): 3
Approach Angle: 0.0
Sedimentation At Inlet: Yes
Inlet Substrate: None
Outlet Substrate: None
InletOutlet
Width(ft):9.5 9.6
Height(ft):6.3 6.2
Apron Length(ft):
Water Depth(ft): 0.0
Rustline Height(ft):1.0
Substrate Depth(ft):0.0 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 1.0
Outfall Type: Free Fall In To Pool
Constriction Ratio:
Culvert Gradient: 5.74%
Max Slope:
Max Slope Length:
 

Comments: Culvert dry at time of survey and only has water at higher flows.
  Culvert Observations:
  1. Culvert gradient red
  2. Outfall height red

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:CobbleCobble
Subdominant:BoulderBoulder
Stream Slope(deg.):
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Upstream ordinary high water 100.0 39.00
Upstream ordinary high water 150.0 32.00
Upstream ordinary high water 300.0 42.00

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Road Elev 110.16
D/S Grade Ctrl (Thalweg) 0.00 92.01
D/S Water Surface Elev 0.00 93.18
D/S Water Surface Elev 5.00 93.14
D/S Grade Ctrl (Thalweg) (End of riffle) 5.00 91.97
D/S Tailcrest or 1st Thalweg 144.00 97.68
D/S Water Surface Elev 144.00 98.26
Max Pool Depth 4 163.00 95.48
Outlet Pool Water Elev 4 163.00 97.01
Outlet Pool Water Elev 2 175.00 98.30
Max Pool Depth 2 175.00 97.73
D/S Water Surface Elev 3 176.00 98.21
Outlet Pool Water Elev 1 176.00 98.32
Max Pool Depth 1 176.00 95.98
Max Pool Depth 3 176.00 96.61
D/S Water Surface Elev 4 181.00 97.65
D/S Thalweg (Just off of pipe) 4 181.00 95.00
Outlet Invert (on pipe) 2 182.00 97.67
D/S Water Surface Elev 2 182.00 98.34
Outlet Invert (on pipe) 1 182.00 98.37
Outlet Invert (on pipe) 3 182.00 98.49
D/S Water Surface Elev 1 182.00 98.62
D/S Water Surface Elev 3 182.00 98.88
Outlet Invert (No water at outlet) 4 182.00 98.98
Outlet Culvert Top 1 182.00 105.05
Outlet Culvert Top 2 182.00 105.06
Outlet Culvert Top 3 182.00 105.21
Outlet Culvert Top 4 182.00 105.52
Inlet Culvert Top 1 236.00 106.58
Inlet Culvert Top 3 236.00 106.63
U/S Water Surface Elev 3 236.00 100.54
Inlet Culvert Invert (on pipe) 3 236.00 99.86
Inlet Culvert Invert 1 236.00 99.89
U/S Water Surface Elev 1 236.00 100.43
U/S Water Surface Elev 2 236.20 99.45
Inlet Culvert Invert 2 236.20 99.10
Inlet Culvert Top 2 236.20 105.98
Inlet Culvert Top 4 237.60 108.73
Inlet Culvert Invert (No water in culvert) 4 237.60 102.17
U/S Grade Ctrl (Thalweg) 3 239.00 99.32
U/S Water Surface Elev 2 240.20 99.45
U/S Grade Ctrl (Thalweg) 2 240.20 99.10
U/S Grade Ctrl (Thalweg) 4 241.60 100.82
U/S Water Surface Elev 4 241.60 101.93
U/S Water Surface Elev 1 244.00 100.43
U/S Grade Ctrl (Thalweg) (Pool upstream of culvert) 1 244.00 99.13
U/S Grade Ctrl (Thalweg) 310.00 105.25
U/S Grade Ctrl (Thalweg) 337.00 104.55
U/S Water Surface Elev 337.00 105.83

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 50 feet upstream
 
Gear Type: Minnow Trap (B) Trap Duration(h): 1.0
Comments: Trap set about 80 feet upstream.

Fish Observations

No fish observations occurred during this survey.

Questions or comments about this report can be directed to dfg.dsf.webmaster@alaska.gov