Fish Passage Site 20501046

Coordinates (dec. deg.): 61.65356°, -149.49871°
Legal Description: S018N001W17
Region: South Central
Road Name: N Sitze Road

Datum: NAD83
Quad Name / ITM: Anchorage C-7
AWC Stream #:
Stream Name: Moon Princess Creek

Elevation:

Site Comments: AKA Colter Creek.

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 MSB09-SIT01

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

Overall Fish Passage Rating: Green

Tidal: No
Backwatered: No

Step Pools: No
Construction Year: 2008


Site Observations:

  1. None of this type

Comments: Post-replacement survey of MSB04ML020. Treated as bottomless arch but may be embedded pipe arch; slope calculated from top of pipe.

Culvert Measurements

ID: 1 Structure Type: Open-bottom arch (Structural steel plate) Fish Passage Rating: Green
 
Length(ft): 70.8
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 2.0
Corrugation Width(in.): 6.0
Condition Rating(1-5): 5
Approach Angle: 0.0
Sedimentation At Inlet: No
Inlet Substrate: Gravel
Outlet Substrate: Cobble
InletOutlet
Width(ft):12.0 12.0
Height(ft):4.2 5.2
Apron Length(ft):
Water Depth(ft): 0.71
Rustline Height(ft):
Substrate Depth(ft):
Backwatered?: No
Baffles Present: No
Embedded?: Yes
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 1.14
Culvert Gradient: 2.29%
Max Slope:
Max Slope Length:
 

Comments: Gradient calculated using top of pipe. Upstream stream gradient is 1.85%. Uniform riffle inside culvert.
  Culvert Observations:
  1. None of this type

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:GravelCobble
Subdominant:GravelGravel
Stream Slope(deg.):1.85
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Upstream ordinary high water 130.0 11.00
Upstream ordinary high water 145.0 9.50
Upstream ordinary high water 175.0 11.00

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Outlet Pool Water Elev 1 93.77
U/S Headwater 1 95.86
(***FROM DIFFERENT BENCHMARK*** invert out - top of pipe - use for slope) 1 97.08
(***FROM DIFFERENT BENCHMARK*** invert in - top of pipe (=original benchmark) - use for slope) 1 98.70
D/S Thalweg 1 0.00 50.0 91.94
D/S Water Surface Elev (@pro) 1 0.00 50.0 92.33
Outlet Invert 1 50.00 0.0 93.06
Road Elev 1 85.40 103.57
Inlet Culvert Invert (thalweg on substrate) 1 120.80 0.0 95.37
U/S Grade Ctrl (Thalweg) 1 133.80 13.0 95.73
U/S Grade Ctrl (Thalweg) 1 159.80 39.0 96.05
U/S Water Surface Elev (@GP) 1 159.80 39.0 96.54
U/S Grade Ctrl (Thalweg) 1 206.80 86.0 97.05
U/S Water Surface Elev (@GP) 1 206.80 86.0 97.72
U/S Grade Ctrl (Thalweg) 1 275.80 155.0 98.38
U/S Water Surface Elev (@GP) 1 275.80 155.0 98.69

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): 1.5
Comments: 75ft u/s; in pool with wood; rest of creek was shallow and fast-moving
 
Gear Type: Visual Observation, Ground (B)
Comments: Visual observation of adult unidentified salmon carcasses upstream from culvert.

Fish Observations

Species: juvenile coho salmon Life History: Anadromous
Total Fish Observed: 14 Fish Measured: 14 Fork Lengths (mm) Min: 42 Max: 98 Mean: 56
Collected/Observed by Gear Type: Upstream Minnow Trap (14)  

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