Fish Passage Site 10302178

Coordinates (dec. deg.): 58.33672°, -134.57640°
Legal Description: C041S066E02
Region: Southeast
Road Name: North Douglas Highway

Datum: NAD83
Quad Name / ITM: Juneau B-2
AWC Stream #: 111-50-10670
Stream Name: Ninemile Creek

Elevation:

Site Comments: None

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 SEA11-NDH03

Project Supervisor: Gillian O'Doherty, Alaska Department of Fish and Game — Anchorage, AK
Observers: Mark Eisenman, Jason Olds

Overall Fish Passage Rating: Gray

Tidal: Yes
Backwatered: No

Step Pools: No
Construction Year:


Site Observations:

  1. Hydraulic flows exceeded capacity
  2. Mechanical damage or joints parting

Comments: No traps were set as stream is already in AWC. There are 5 step pool fish ladder structures constructed with log wiers downstream of the invert out. Vertical oval pipe. Wier 1 (closest to invert out) has water flowing subsurface and wier 2 has water flowing mostly around the edges. There is pipe damage inside from rust. Gradient of 1.5% is an estimate using the laser range finder as pipe length/grade was too long/steep to get an accurate measurement with Leica level and over road was impared by too much fill, steep grade and overgrown vegetation. Rustline eaten through pipe in significant sections. Pipe sections parting. Pipe may have been embedded at one time.

Culvert Measurements

ID: 1 Structure Type: Oval (Corrugated steel) Fish Passage Rating: Gray
 
Length(ft): 152.5
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.75
Corrugation Width(in.): 3.0
Condition Rating(1-5): 2
Approach Angle: 23.0
Sedimentation At Inlet: Yes
Inlet Substrate: Cobble
Outlet Substrate: Gravel
InletOutlet
Width(ft):4.7 4.7
Height(ft):5.4 5.4
Apron Length(ft):
Water Depth(ft): 0.43
Rustline Height(ft):2.3
Substrate Depth(ft):0.2 0.0
Backwatered?: No
Baffles Present: Yes
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 0.47
Culvert Gradient: 1.50%
Max Slope:
Max Slope Length:
 

Comments: Slope is estimated.
  Culvert Observations:
  1. Hydraulic flows exceeded capacity
  2. Mechanical damage or joints parting

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:BoulderGravel
Subdominant:GravelSilt/Clay
Stream Slope(deg.):
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Upstream ordinary high water 39.0 10.90
Upstream ordinary high water 57.0 9.20
Upstream ordinary high water 99.0 9.70

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
D/S Grade Ctrl (Thalweg) 0.00 95.83
D/S Water Surface Elev 0.00 96.15
D/S Grade Ctrl (Thalweg) 39.00 97.81
D/S Water Surface Elev 39.00 97.99
D/S Water Surface Elev (Below log wier 5) 43.00 97.98
Max Pool Depth (Below log wier 5) 43.00 96.81
D/S Grade Ctrl (Thalweg) (Log wier 5, on log notch) 45.00 98.89
D/S Water Surface Elev (Log wier 5) 45.00 99.07
D/S Water Surface Elev (Below log wier 4) 54.50 99.15
Max Pool Depth (Below log wier 4) 54.50 98.03
D/S Grade Ctrl (Thalweg) (Log wier 4, on log notch) 56.00 99.89
D/S Water Surface Elev (Log wier 4) 56.00 100.11
D/S Water Surface Elev (Below log wier 3) 63.00 100.17
Max Pool Depth (Below log wier 3) 63.00 99.06
D/S Grade Ctrl (Thalweg) (Log wier 3, on log notch) 65.50 100.73
D/S Water Surface Elev (Log wier 3) 65.50 100.89
D/S Water Surface Elev (Below log wier 2) 71.00 100.97
Max Pool Depth (Below log wier 2) 71.00 99.91
D/S Grade Ctrl (Thalweg) (Log wier 2, on log notch) 75.00 101.73
D/S Water Surface Elev (Log wier 2) 75.00 101.78
D/S Water Surface Elev (Below log wier 1) 80.00 101.81
Max Pool Depth (Below log wier 1) 80.00 100.22
D/S Grade Ctrl (Thalweg) (Log wier 1, on log notch, no water flow) 83.50 102.63
Outlet Pool Water Elev 88.50 102.08
Max Pool Depth (Pool below invert out) 88.50 101.36
Outlet Invert (Invert out, on metal) 93.00 101.65
D/S Water Surface Elev (Invert out) 93.00 102.08

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: None (A)
Comments: No traps set no fish observed.

Fish Observations

No fish observations occurred during this survey.

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