Fish Passage Site 20501037

Coordinates (dec. deg.): 61.66375°, -149.33495°
Legal Description: S018N001E07
Region: South Central
Road Name: North Welsh Way

Datum: NAD83
Quad Name / ITM: Anchorage C-7
AWC Stream #: 247-41-10100-2332
Stream Name: Unnamed

Elevation:

Site Comments: Creek is a side channel to the Little Susitna River

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 MSB04-ML011

Observers: Gary Greenberg, K J

Overall Fish Passage Rating: Gray

Tidal: No
Backwatered: Yes

Step Pools:
Construction Year:


Site Observations:

  1. Hydraulic flows exceeded capacity
  2. Culvert gradient gray
  3. Culvert gradient red

Comments: Updated site photos from 8/31/16 site visit from the Sampling Unmapped Streams in the MSB project. Fish information from 8.31.16 site visit entered into AFFI. Looks like the road has been upgraded since the 2004 site assessment and additional lengths of culvert added at the outlets.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated Metal) Fish Passage Rating: Red
 
Length(ft): 30.0
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.):
Corrugation Width(in.): 3.0
Condition Rating(1-5):
Approach Angle:
Sedimentation At Inlet:
Inlet Substrate:
Outlet Substrate:
InletOutlet
Width(ft):3.0
Height(ft):3.0
Apron Length(ft):
Water Depth(ft):0.1 0.4
Rustline Height(ft):0.4
Substrate Depth(ft):
Backwatered?:
Baffles Present: No
Embedded?: No
Outfall Height:
Outfall Type: At Stream Grade
Constriction Ratio: 0.36
Culvert Gradient: 1.73%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Culvert gradient red
  2. Hydraulic flows exceeded capacity
ID: 2 Structure Type: Circular pipe (Corrugated Metal) Fish Passage Rating: Gray
 
Length(ft): 30.0
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.):
Corrugation Width(in.): 3.0
Condition Rating(1-5):
Approach Angle:
Sedimentation At Inlet:
Inlet Substrate:
Outlet Substrate:
InletOutlet
Width(ft):3.0
Height(ft):2.8
Apron Length(ft):
Water Depth(ft):0.7 0.6
Rustline Height(ft):1.1
Substrate Depth(ft):
Backwatered?: Yes
Baffles Present: No
Embedded?: No
Outfall Height:
Outfall Type: At Stream Grade
Constriction Ratio: 0.36
Culvert Gradient: 0.97%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Culvert gradient gray
  2. Hydraulic flows exceeded capacity

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:
Subdominant:
Stream Slope(deg.):
Stream Flow Stage:
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Upstream bed width 75.0 14.00
Upstream bed width 100.0 16.80
Upstream bed width 125.0 16.10
Upstream bed width 150.0 15.80
Upstream ordinary high water 75.0 14.80
Upstream ordinary high water 100.0 17.50
Upstream ordinary high water 125.0 16.70
Upstream ordinary high water 150.0 16.80

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
OHW Left Bank 97.40
OHW Left Bank 97.41
D/S Tailcrest or 1st Thalweg 0.00 14.2 97.21
D/S Thalweg 8.60 5.6 99.76
Max Pool Depth 10.80 3.4 96.84
Outlet Invert 2 14.20 0.0 96.85
Outlet Invert 1 14.20 0.0 97.10
Road Elev 29.20 101.70
Inlet Culvert Invert 1 44.20 0.0 97.62
Inlet Culvert Invert 2 44.20 0.0 97.14
U/S Water Surface Elev 2 48.30 4.1 97.05
U/S Water Surface Elev 1 48.30 4.1 97.59
U/S Thalweg 1 50.20 6.0 96.98
U/S Thalweg 2 50.20 6.0 97.01

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.

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