Fish Passage Improvement site 30303064

Fish Passage Site 30303064

Coordinates (dec. deg.): 59.20638°, -158.67271°
Legal Description: S011S056W23
Region: Southwest
Road Name: Aleknagik Lake Road

Datum: NAD83
Quad Name / ITM: Dillingham A-8
AWC Stream #: 325-30-10100-2031-3039-4202
Stream Name: Wood River tributary

Elevation:

Site Comments: None

Survey Date: Sep 18, 2012

Survey SWA12-DIL02

site photos

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

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:

Site Observations:

Culvert gradient red
Constriction ratio gray
Road bank erosion
Culvert is too short
Culvert is poorly aligned

Comments: Some substrate in pipe. Upstream channel armored.

Culvert Measurements

ID: 1

Structure Type: Pipe-arch (Structural steel plate)

Fish Passage Rating: Red

Length(ft): 54.1

Inlet Type: Mitered

Outlet Type: Mitered

Corrugation Depth(in.): 2.0

Corrugation Width(in.): 6.0

Condition Rating(1-5): 3

Approach Angle: 65.0

Sedimentation At Inlet: Yes

Inlet Substrate: None

Outlet Substrate: Gravel

	Inlet	Outlet
Width(ft):	11.0	11.0
Height(ft):	7.0	5.4
Apron Length(ft):
Water Depth(ft):		1.31
Rustline Height(ft):	2.2
Substrate Depth(ft):	0.0	1.6

Backwatered?: No

Baffles Present: No

Embedded?: No

Outfall Height: 0.0

Outfall Type: At Stream Grade

Constriction Ratio: 0.72

Culvert Gradient: 3.65%

Max Slope:

Max Slope Length:

Comments: Top of miter length 37 feet. No stream grade--water too high and fast. Water surface gradient only 0.57%.

Culvert Observations:

Culvert gradient red
Constriction ratio gray
Road bank erosion
Culvert is too short

Stream Measurements

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

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

Stream Width Type	Distance From Crossing (ft)	Stream Width (ft)
Downstream ordinary high water		14.00
Downstream ordinary high water		16.00
Downstream ordinary high water	50.0	16.00

Elevations

Locator ID	River Distance (ft)¹	Relative Elevation (ft)
Road Elev		99.53
D/S Thalweg (riffle down from outlet)	0.00	88.69
D/S Water Surface Elev	0.00	90.23
D/S Water Surface Elev	38.00	90.50
Outlet Invert (on substrate)	38.00	89.19
Outlet Culvert Top (top of miter)	47.00	94.80
Inlet Culvert Top (top of miter)	84.00	96.15
Inlet Culvert Invert (on pipe)	92.10	88.88
U/S Water Surface Elev	92.10	90.81
U/S Thalweg	104.10	89.29
U/S Water Surface Elev	104.10	90.77

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.