Fish Passage Site 20501056

Coordinates (dec. deg.): 61.59986°, -149.69225°
Legal Description: S018N002W32
Region: South Central
Road Name: ATV Trail

Datum: NAD83
Quad Name / ITM: Anchorage C-8
AWC Stream #:
Stream Name: Laylen Lake Outlet

Elevation:

Site Comments: Site is upstream from 20501057 (Skyview and Carorsel way)

Survey Date: Sep 30, 2004

Survey MSB04-ML030

Observers: Gary Greenberg, I S

Overall Fish Passage Rating: Green

Tidal: No
Backwatered: Yes

Step Pools:
Construction Year:


Comments: Updated site photos and fish capture information from 9/1/16 site visit from Sampling Unmapped Streams in the MSB project.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated Metal) Fish Passage Rating: Green
 
Length(ft): 21.0
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.):
Corrugation Width(in.): 0.0
Condition Rating(1-5):
Approach Angle:
Sedimentation At Inlet:
Inlet Substrate:
Outlet Substrate:
InletOutlet
Width(ft):4.0
Height(ft):4.0
Apron Length(ft):
Water Depth(ft):0.5 0.4
Rustline Height(ft):1.5
Substrate Depth(ft):
Backwatered?: Yes
Baffles Present: No
Embedded?: No
Outfall Height:
Outfall Type: At Stream Grade
Constriction Ratio: 0.69
Culvert Gradient:
Max Slope:
Max Slope Length:

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 4.80
Upstream bed width 100.0 4.70
Upstream bed width 125.0 5.20
Upstream ordinary high water 75.0 5.60
Upstream ordinary high water 100.0 5.30
Upstream ordinary high water 125.0 6.40

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
OHW Left Bank 96.55
OHW Left Bank 96.57
D/S Tailcrest or 1st Thalweg 0.00 14.5 96.24
Max Pool Depth 10.50 4.0 96.12
D/S Thalweg 10.50 4.0 96.12
Outlet Invert 1 14.50 0.0 96.15
Road Elev 25.00 100.04
Inlet Culvert Invert 1 35.50 0.0 96.09
U/S Water Surface Elev 1 40.20 4.7 96.05
U/S Thalweg 1 43.50 8.0 95.81

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