Fish Passage Site 20501493

Coordinates (dec. deg.): 62.49026°, -150.98520°
Legal Description: S028N009W29
Region: South Central
Road Name: Petersville Road

Datum: WGS84
Quad Name / ITM: Talkeetna B-2
AWC Stream #:
Stream Name: Cache Creek tributary

Elevation:

Site Comments: Outlet pours into Cache Creek.

Survey Date: Jun 28, 2009

Survey PRK09-PVR16

Project Supervisor: Gillian O'Doherty, ADFG
Observers: Heidi Zimmer, Ben Histand

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools:
Construction Year:


Site Observations:

  1. Outfall height red
  2. Culvert gradient red
  3. Mechanical damage or joints parting
  4. Shallow fill; inadequate roadfill volume above culvert
  5. Road bank erosion
  6. Compound gradient in pipe

Comments: Inlet broken and twisted; multiple bends sideways in pipe; outlet pours into Cache Creek

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating:
 
Length(ft): 39.5
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 2.75
Condition Rating(1-5): 2
Approach Angle: 75.0
Sedimentation At Inlet: Yes
Inlet Substrate: None
Outlet Substrate: None
InletOutlet
Width(ft):1.9 2.0
Height(ft):2.0 2.0
Apron Length(ft):
Water Depth(ft): 0.11
Rustline Height(ft):0.3
Substrate Depth(ft):0.0 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 1.45
Outfall Type: Free Fall In To Pool
Constriction Ratio:
Culvert Gradient: 3.14%
Max Slope:
Max Slope Length:
 

Comments: No stream widths upstream is braided channels from beaver dam and Cache Creek is directly downstream. Inlet is broken and twisted. Multiple bends in pipe.
  Culvert Observations:
  1. Outfall height red
  2. Culvert gradient red
  3. Mechanical damage or joints parting
  4. Shallow fill; inadequate roadfill volume above culvert
  5. Road bank erosion
  6. Compound gradient in pipe

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:GravelCobble
Subdominant:SandGravel
Stream Slope(deg.):
Stream Flow Stage:

No stream width data available.

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Outlet Pool Water Elev (= WS of cache cr below inv out) 1 95.24
U/S Headwater 1 98.26
D/S Thalweg (bottom of plunge, bed of cache cr) 1 0.00 1.5 93.92
D/S Water Surface Elev 1 0.70 0.8 98.27
Outlet Invert 1 1.50 0.0 96.58
Road Elev 1 21.00 101.27
Inlet Culvert Invert 1 40.50 0.0 97.82
U/S Grade Ctrl (Thalweg) (1st TC u/s) 1 41.30 0.8 97.96

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