Fish Passage Site 10302248

Coordinates (dec. deg.): 58.41502°, -135.71565°
Legal Description: C040S059E08
Region: Southeast
Road Name: Gustavus Road

Datum: NAD83
Quad Name / ITM: Juneau B-6
AWC Stream #:
Stream Name: Glen's Ditch tributary

Elevation:

Site Comments: None

Survey Date: Aug 06, 2011

Survey SEA11-GUS01

Project Supervisor: Gillian O'Doherty, Alaska Department of Fish and Game — Anchorage, AK
Observers: Jason Olds, Charmagne Gutierrez

Overall Fish Passage Rating: Green

Tidal: No
Backwatered: Yes

Step Pools: No
Construction Year:


Site Observations:

  1. Culvert is too short

Comments: Visual observation of juvenile salmonids, upstream, downstream, and inside pipe.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Green
 
Length(ft): 81.2
Inlet Type: Mitered
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 3.0
Condition Rating(1-5): 4
Approach Angle: 1.0
Sedimentation At Inlet: No
Inlet Substrate: Organic
Outlet Substrate: Sand
InletOutlet
Width(ft):4.0 4.0
Height(ft):4.0 3.4
Apron Length(ft):
Water Depth(ft): 0.5
Rustline Height(ft):
Substrate Depth(ft):0.0 0.8
Backwatered?: Yes
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 1.38
Culvert Gradient: 0.52%
Max Slope:
Max Slope Length:
 

Comments: Metal corrosion at outlet; not steel. *True pipe grade using TOP 0.52%.
  Culvert Observations:
  1. Culvert is too short

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:SandSand
Subdominant:OrganicOrganic
Stream Slope(deg.):0.2
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Upstream ordinary high water 32.0 3.40
Upstream ordinary high water 54.0 3.30
Upstream ordinary high water 74.0 2.10

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Road Elev 106.00
D/S Tailcrest or 1st Thalweg 0.00 96.44
D/S Water Surface Elev 0.00 96.86
Outlet Pool Water Elev 3.00 96.86
Max Pool Depth 3.00 96.23
Outlet Invert (on substrate) 9.00 96.64
D/S Water Surface Elev 9.00 96.86
Outlet Culvert Top 9.00 100.00
Inlet Culvert Top 90.20 100.42
U/S Headwater 90.20 96.86
Inlet Culvert Invert (on substrate) 90.20 96.40
U/S Water Surface Elev 95.00 96.87
U/S Water Surface Elev 165.00 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

Gear Type: Visual Observation, Ground (A) Trap Duration(h): 30.0
Channel Type: Main Channel (>50% of water flow)
Comments: Unidentified juveniles observed upstream, downstream and in culvert.
 
Gear Type: Visual Observation, Ground (B) Trap Duration(h): 30.0
Channel Type: Main Channel (>50% of water flow)

Fish Observations

No fish observations occurred during this survey.

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