Fish Passage Improvement site 10302156

Fish Passage Site 10302156

Coordinates (dec. deg.): 58.32307°, -134.48219°
Legal Description: C041S067E08
Region: Southeast
Road Name: North Douglas Highway

Datum: NAD83
Quad Name / ITM: Juneau B-2
AWC Stream #:
Stream Name: Falls Creek

Elevation:

Site Comments: None

Survey Date: Jun 18, 2011

Survey SEA11-NDH07

site photos

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

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:

Site Observations:

Outfall height red
Constriction ratio red
Culvert gradient red
Debris Flow

Comments: No traps set due to previous catalogue in AWC. Dolly Varden observed upstream. Nice pool complexes upstream. Large outfall at invert out. Long profile shot through pipe with Leica 730 from the upstream invert in. Steep fill grade to road surface from culvert, very overgrown.

Culvert Measurements

ID: 1

Structure Type: Circular pipe (Structural steel plate)

Fish Passage Rating: Red

Length(ft): 95.4

Inlet Type: Projecting

Outlet Type: Projecting

Corrugation Depth(in.): 2.0

Corrugation Width(in.): 6.0

Condition Rating(1-5): 3

Approach Angle: 27.0

Sedimentation At Inlet: Yes

Inlet Substrate: None

Outlet Substrate: None

	Inlet	Outlet
Width(ft):	8.9	8.9
Height(ft):	9.5	9.5
Apron Length(ft):
Water Depth(ft):		0.48
Rustline Height(ft):	2.3
Substrate Depth(ft):	0.0	0.0

Backwatered?: No

Baffles Present: No

Embedded?: No

Outfall Height: 4.88

Outfall Type: Free Fall In To Pool

Constriction Ratio: 0.47

Culvert Gradient: 6.59%

Max Slope:

Max Slope Length:

Culvert Observations:

Outfall height red
Constriction ratio red
Culvert gradient red
Debris Flow

Stream Measurements

Stream Substrates	Upstream	Downstream
Dominant:	Cobble	Boulder
Subdominant:	Gravel	Cobble

Stream Slope(deg.):
Stream Flow Stage:	Medium

Stream Width Type	Distance From Crossing (ft)	Stream Width (ft)
Upstream ordinary high water	118.0	20.00
Upstream ordinary high water	226.0	15.10
Upstream ordinary high water	300.0	22.10

Elevations

Locator ID	River Distance (ft)¹	Relative Elevation (ft)
D/S Tailcrest or 1st Thalweg	0.00	85.94
D/S Water Surface Elev (Tailwater control)	0.00	86.61
Max Pool Depth	3.00	84.20
Outlet Invert (On metal)	11.00	91.01
D/S Water Surface Elev (Water surface at invert out)	11.00	91.49
Inlet Culvert Invert (On metal)	106.38	97.30
U/S Water Surface Elev (Water surface at invert in)	106.38	97.86
U/S Headwater (1st resting)	107.00	97.87

Notes:

River distance is measured continuously throughout the survey reach along the thalweg of the stream.
Measured from each end of the crossing along the thalweg of the stream.