Fish Passage Site 10302247

Coordinates (dec. deg.): 58.41245°, -135.71274°
Legal Description: C040S059E17
Region: Southeast
Road Name: Glen's Ditch Road

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

Elevation:

Site Comments: Site is just downstream from GDR02.

Survey Date: Aug 06, 2011

Survey SEA11-GDR01

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: Ditch upstream and downstream from culvert.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Green
 
Length(ft): 20.6
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 3.0
Condition Rating(1-5): 3
Approach Angle: 0.0
Sedimentation At Inlet: No
Inlet Substrate: Sand
Outlet Substrate: Sand
InletOutlet
Width(ft):4.0 3.5
Height(ft):2.9 3.2
Apron Length(ft):
Water Depth(ft): 1.27
Rustline Height(ft):1.9
Substrate Depth(ft):
Backwatered?: Yes
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 1.38
Culvert Gradient:
Max Slope:
Max Slope Length:
 

Comments: Ditch: Young of Year Upstream/Downstream. * Pipe grade calculated with Water surface Elevation: Extreme substrate differences created unnatural representation of gradient where system be backwatered further down stream in a nearly continous glide where a TWC was not found but juvinle fish swimmimg throughout pipe in nearly flatwatered conditions suggest a 14% GRADIENT to be a gross representation of passage conditions.
  Culvert Observations:
  1. Culvert is too short

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:SandSand
Subdominant:GravelOrganic
Stream Slope(deg.):
Stream Flow Stage:Medium

No stream width data available.

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Road Elev 96.32
Misc. (No discernable tailcrest) 0.00 91.34
D/S Water Surface Elev 0.00 91.97
D/S Water Surface Elev 30.00 91.98
Outlet Thalweg 30.00 90.71
U/S Headwater 50.60 91.99
Inlet Thalweg 50.60 91.55

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: Observed inidentified juveniles upstream and downstream from 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