Fish Passage Site 20401202

Coordinates (dec. deg.): 61.54816°, -149.26788°
Legal Description: S017N001E22
Region: South Central
Road Name: Nelson Road

Datum: WGS84
Quad Name / ITM: Anchorage C-7
AWC Stream #:
Stream Name: Spring 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 MSB09-NEL01

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

Overall Fish Passage Rating: Green

Tidal: No
Backwatered: No

Step Pools:
Construction Year:


Site Observations:

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

Comments: Rusted through & collapsing; sinkhole in u/s shoulder; TWC>inverts but HWS are not equal TWS so not backwatered. Pipe plugged?

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Green
 
Length(ft): 49.0
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 2.67
Condition Rating(1-5): 1
Approach Angle: 26.0
Sedimentation At Inlet: No
Inlet Substrate: None
Outlet Substrate: Gravel
InletOutlet
Width(ft):3.1 3.0
Height(ft):2.8 1.8
Apron Length(ft):
Water Depth(ft): 1.5
Rustline Height(ft):2.8
Substrate Depth(ft):0.0 1.2
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio:
Culvert Gradient: -1.31%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Mechanical damage or joints parting
  2. Hydraulic flows exceeded capacity
  3. Sediment accumulation

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:Silt/ClaySilt/Clay
Subdominant:Silt/ClaySilt/Clay
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)
Inlet Road Edge (bottom of sinkhole) 1 96.34
Road Elev 1 99.52
D/S Water Surface Elev (d/s WS (where current fans out into wetland) 1 0.00 50.0 95.56
D/S Water Surface Elev 1 45.50 4.5 95.70
D/S Tailcrest or 1st Thalweg 1 45.50 4.5 94.95
Outlet Pool Water Elev 1 50.00 95.71
Outlet Invert (on substrate) 1 50.00 0.0 94.21
Inlet Culvert Invert 1 99.00 0.0 93.57
U/S Headwater 1 99.00 96.07

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): 0.75
Comments: 30ft d/s
 
Gear Type: Minnow Trap (B) Trap Duration(h): 0.75
Comments: no fish caught; 60ft u/s; sunk into aquatic vegetation
 
Gear Type: Visual Observation, Ground (A)
Comments: Visual observation of small salmonids upstream from culvert.

Fish Observations

Species: Alaska blackfish Life History: Not Recorded
Total Fish Observed: 1 Fish Measured: 1 Fork Lengths (mm) Min: 120 Max: 120 Mean: 120
Collected/Observed by Gear Type: Upstream Visual Observation, Ground (1)  Downstream Minnow Trap (1)  
 
Species: juvenile coho salmon Life History: Anadromous
Total Fish Observed: 1 Fish Measured: 1 Fork Lengths (mm) Min: 58 Max: 58 Mean: 58
Collected/Observed by Gear Type: Upstream Visual Observation, Ground (1)  Downstream Minnow Trap (1)  

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