Fish Passage Site 20300206

Coordinates (dec. deg.): 60.95693°, -149.11571°
Legal Description: S010N002E16
Region: South Central
Road Name: Driveway

Datum: NAD83
Quad Name / ITM: Seward D-6
AWC Stream #:
Stream Name: Glacier Creek tributary

Elevation:

Site Comments: Driveway off of Alyeska View Avenue. Just upstream from 20300204 and 20300205.

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 UPD21-ALY06

Project Supervisor: Kim Clark, ADFG — Anchorage, AK
Observers: Kim Clark, Michael Mazzacavallo

Overall Fish Passage Rating: Gray

Tidal: No
Backwatered: No

Step Pools: No
Construction Year: 2019


Site Observations:

  1. Inlet perch

Comments: Culvert is installed steeper than stream. Sediment is about 1.4 feet below orange fill line on culvert. Rip rap has fallen in near inlet. Some bank erosion present both up and downstream. Bedload is at 80%. Monitoring recommended.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Gray
 
Length(ft): 40.5
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 3.0
Condition Rating(1-5): 5
Approach Angle: 0.0
Sedimentation At Inlet: No
Inlet Substrate: Boulder
Outlet Substrate: Gravel
InletOutlet
Width(ft):5.0 5.0
Height(ft):4.6 3.9
Apron Length(ft):
Water Depth(ft): 0.28
Rustline Height(ft):1.2
Substrate Depth(ft):0.4 1.1
Backwatered?: No
Baffles Present: No
Embedded?: Maybe
Embedded Depth(ft): 0.4
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 1.36
Culvert Gradient: 6.20%
Max Slope:
Max Slope Length:
 

Comments: Pipe gradient is designed at 3.84%. Stream gradient upstream of ditch and all culverts is 8.5% and stream gradient downstream is 2.7%.

  Culvert Observations:
  1. Inlet perch

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:BoulderCobble
Subdominant:GravelGravel
Stream Slope(deg.):2.7
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)
Stream
Width (ft)
Downstream ordinary high water 7.0 7.70
Downstream ordinary high water 15.0 7.40
Downstream ordinary high water 21.0 7.80
Upstream ordinary high water 15.0 4.20
Upstream ordinary high water 29.0 2.80
Upstream ordinary high water 38.0 4.00

Elevations

Locator ID Culvert
Number
River
Distance (ft)1
Distance From
Crossing (ft)2
Relative
Elevation (ft)
D/S Water Surface Elev 0.00 95.58
D/S Thalweg 0.00 95.16
D/S Water Surface Elev 9.50 95.77
D/S Thalweg 9.50 95.42
D/S Water Surface Elev 17.30 96.16
D/S Thalweg 17.30 95.91
Outlet Culvert Top (top of outlet was bent. Measurement taken 1 corrugation back.) 20.00 100.00
Outlet Invert 20.00 96.02
D/S Water Surface Elev 20.00 96.30
Inlet Culvert Top 60.50 97.49
U/S Water Surface Elev 60.50 97.26
Inlet Culvert Invert 60.50 96.63
U/S Water Surface Elev 66.50 98.04
U/S Thalweg 66.50 97.81
U/S Water Surface Elev 90.10 99.38
U/S Thalweg 90.10 99.24

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