Fish Passage Improvement site 30303065

Fish Passage Site 30303065

Coordinates (dec. deg.): 59.18903°, -158.67247°
Legal Description: S011S056W26
Region: Southwest
Road Name: Aleknagik Lake Road

Datum: NAD83
Quad Name / ITM: Dillingham A-8
AWC Stream #:
Stream Name: Wood River tributary

Elevation:

Site Comments: None

Survey Date: Sep 18, 2012

Survey SWA12-DIL03

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: Gray

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:

Site Observations:

Culvert gradient gray
Culvert is poorly aligned

Comments: Almost embedded but inlet scoured clean, plus concrete headwall, too. Culvert is set just next to stream at inlet instead of inline so makes two 90-degree bends and lots of scour.

Culvert Measurements

ID: 1

Structure Type: Pipe-arch (Structural steel plate)

Fish Passage Rating: Gray

Length(ft): 50.8

Inlet Type: Mitered

Outlet Type: Mitered

Corrugation Depth(in.): 2.0

Corrugation Width(in.): 6.0

Condition Rating(1-5): 3

Approach Angle: 90.0

Sedimentation At Inlet: Yes

Inlet Substrate: None

Outlet Substrate: Gravel

	Inlet	Outlet
Width(ft):	7.0	7.0
Height(ft):	5.0	3.5
Apron Length(ft):
Water Depth(ft):		0.63
Rustline Height(ft):	2.3
Substrate Depth(ft):	0.0	1.5

Backwatered?: No

Baffles Present: No

Embedded?: No

Outfall Height: 0.0

Outfall Type: At Stream Grade

Constriction Ratio: 0.96

Culvert Gradient: 1.54%

Max Slope:

Max Slope Length:

Comments: Top of miter length is 39.6 feet.

Culvert Observations:

Culvert gradient gray
Culvert is poorly aligned

Stream Measurements

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

Stream Slope(deg.):	3.63
Stream Flow Stage:	High

Stream Width Type	Distance From Crossing (ft)	Stream Width (ft)
Upstream ordinary high water		8.00
Upstream ordinary high water	50.0	7.00
Upstream ordinary high water	71.0	6.80

Elevations

Locator ID	River Distance (ft)¹	Relative Elevation (ft)
Road Elev		100.51
D/S Grade Ctrl (Thalweg)	0.00	91.98
D/S Water Surface Elev	0.00	92.57
D/S Thalweg (pool)	11.00	90.84
D/S Water Surface Elev	11.00	92.72
D/S Water Surface Elev	25.00	92.85
D/S Grade Ctrl (Thalweg)	25.00	92.04
Outlet Invert (substrate)	29.00	92.29
D/S Water Surface Elev	29.00	92.92
Outlet Culvert Top (to of miter)	35.00	95.92
U/S Thalweg (substrate below top of miter)	74.60	92.51
Inlet Culvert Top (top of miter)	74.60	96.53
Inlet Culvert Invert (on pipe)	80.60	91.45
U/S Water Surface Elev	80.60	93.50
U/S Water Surface Elev (stream grade)	86.60	93.51
U/S Grade Ctrl (Thalweg)	86.60	92.67
U/S Water Surface Elev	103.60	94.31
U/S Grade Ctrl (Thalweg)	103.60	93.48
U/S Water Surface Elev	162.60	96.27

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.