Fish Passage Site 20401270

Coordinates (dec. deg.): 61.63292°, -149.27370°
Legal Description: S018N001E21
Region: South Central
Road Name: Private- Camp Challenge Christ

Datum: NAD83
Quad Name / ITM: Anchorage C-7
AWC Stream #:
Stream Name: Neklason Lake Tributary

Elevation:

Site Comments: Creek just west Camp Challenge/culvert beneath camp trail nearst lake at top of steep grade. Culvert crossing is at top of steep grade, stream begins drop off hill/moraine approximately 30' downstream

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 MSB11-CCT01

Project Supervisor: Gillian O'Doherty, Alaska Department of Fish and Game — Anchorage, AK
Observers: John Greuey, Abraham Gioffre

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:


Site Observations:

  1. Constriction ratio red
  2. Woody Debris
  3. Sediment accumulation
  4. Mechanical damage or joints parting
  5. Culvert gradient red

Comments: Private Road trail on Camp Challenge Christian Camp property with culvert over small tributary to lake on property. Downstream of outlet was a max. gradient created with woody debris. Six feet downstream of inlet in pipe is a partial woody debris blockage. Pipe is crushed/ bent. Dwst of outlet the channel had a max gradient of 13.1%.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Red
 
Length(ft): 16.1
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 3.0
Condition Rating(1-5): 1
Approach Angle: 6.0
Sedimentation At Inlet: Yes
Inlet Substrate: Cobble
Outlet Substrate: Gravel
InletOutlet
Width(ft):1.5 1.96
Height(ft):1.2 1.85
Apron Length(ft):0.0 0.0
Water Depth(ft): 0.36
Rustline Height(ft):0.7
Substrate Depth(ft):0.35 0.18
Backwatered?: No
Baffles Present: No
Embedded?: No
Embedded Depth(ft): 0.0
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 0.48
Culvert Gradient: 5.50%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Constriction ratio red
  2. Woody Debris
  3. Sediment accumulation
  4. Mechanical damage or joints parting
  5. Culvert gradient red

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:GravelGravel
Subdominant:SandSand
Stream Slope(deg.):5.7
Stream Flow Stage:Low
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Downstream ordinary high water 12.0 3.50
Downstream ordinary high water 20.0 2.80
Downstream ordinary high water 24.0 3.00

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
D/S Grade Ctrl (Thalweg) (Mid point of riffle) 0.00 95.87
D/S Water Surface Elev (Used for stream gradient) 0.00 95.98
D/S Thalweg (Profile point at grade break due to wooden debris.) 14.00 96.70
D/S Water Surface Elev 14.00 97.07
D/S Thalweg (Profile point at grade break due to wooden debris.) 21.00 97.03
D/S Water Surface Elev 21.00 97.38
D/S Water Surface Elev (Used for stream gradient and max gradient.) 28.00 97.58
D/S Grade Ctrl (Thalweg) (Pool area below max gradient) 28.00 97.36
Outlet Culvert Top 35.00 100.01
Outlet Invert (On substrate) 35.00 98.14
D/S Water Surface Elev (Water surface at outlet invert. Used for max gradient) 35.00 98.50
Road Elev 43.00 100.90
Inlet Culvert Invert (On substrate) 51.10 99.84
Inlet Culvert Top 51.10 100.00
U/S Water Surface Elev (Water surface at inlet invert) 51.10 99.38
U/S Grade Ctrl (Thalweg) (created and controlled by wooden debris) 73.10 99.50
U/S Water Surface Elev 73.10 99.77

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

No fish sampling occurred during this survey.

Fish Observations

No fish observations occurred during this survey.

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