Fish Passage Improvement site 20501418

Fish Passage Site 20501418

Coordinates (dec. deg.): 62.21139°, -150.07844°
Legal Description: S025N004W31
Region: South Central
Road Name: Talkeetna Spur Road

Datum: NAD83
Quad Name / ITM: Talkeetna A-1
AWC Stream #: 247-41-10200-2300-3011-4008
Stream Name: Question Creek tributary

Elevation:

Site Comments: SUSITNA RIVER WATERSHED, HUMAN MADE DAMS ABOVE AND BELOW CULVERT,

Multiple surveys have been conducted at this site — click on the drop down
arrow to the right of the survey date below to choose a different report for this site.

Survey PRK09-TSR04

site photos

Project Supervisor: Gillian O'Doherty, ADFG
Observers: Heidi Zimmer, Ben Histand

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:

Site Observations:

Compound gradient in pipe
Culvert gradient red
Constriction ratio gray
Other, including vibrations, cavitation, etc.

Comments: Resurvey of PRK041A055; obs 5-10cm salmonids at outlet; upper 1/2 of pipe is cobble riffle then flat WS w/little subs. Dammed by landowner for water supply.

Culvert Measurements

ID: 1

Structure Type: Circular pipe (Structural steel plate)

Fish Passage Rating: Red

Length(ft): 131.9

Inlet Type: Headwall

Outlet Type: Headwall

Corrugation Depth(in.): 0.5

Corrugation Width(in.): 2.67

Condition Rating(1-5): 3

Approach Angle: 21.0

Sedimentation At Inlet: No

Inlet Substrate: Cobble

Outlet Substrate: Sand

	Inlet	Outlet
Width(ft):	4.8	4.8
Height(ft):	4.4	5.0
Apron Length(ft):
Water Depth(ft):		1.4
Rustline Height(ft):	1.8
Substrate Depth(ft):	0.7	0.1

Backwatered?: No

Baffles Present: No

Embedded?: No

Outfall Height: 0.0

Outfall Type: At Stream Grade

Constriction Ratio: 0.58

Culvert Gradient: 2.12%

Max Slope:

Max Slope Length:

Comments: Constructed TWC directly downstream from outlet.

Culvert Observations:

Compound gradient in pipe
Culvert gradient red
Constriction ratio gray

Stream Measurements

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

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

Stream Width Type	Distance From Crossing (ft)	Stream Width (ft)
Upstream ordinary high water	100.0	9.00
Upstream ordinary high water	140.0	8.50
Upstream ordinary high water	180.0	7.50

Elevations

Locator ID	Culvert Number	River Distance (ft)¹	Distance From Crossing (ft)²	Relative Elevation (ft)
Outlet Pool Water Elev	1			75.27
U/S Headwater	1			77.03
D/S Thalweg	1	0.00	75.0	72.19
D/S Grade Ctrl (Thalweg)	1	5.00	70.0	73.81
D/S Water Surface Elev (WS @ GP)	1	5.00	70.0	73.85
D/S Water Surface Elev (WS @ GP)	1	44.00	31.0	80.97
D/S Thalweg	1	50.00	25.0	74.03
D/S Tailcrest or 1st Thalweg	1	54.00	21.0	75.12
D/S Water Surface Elev (WS @ TWC)	1	54.00	21.0	75.26
D/S Thalweg (out pool bottom (on mud))	1	64.00	11.0	72.91
D/S Thalweg	1	70.00	5.0	73.86
Outlet Invert	1	75.00	0.0	73.87
Road Elev	1	140.50		100.30
Inlet Culvert Invert	1	206.00	0.0	76.66
U/S Thalweg	1	224.00	18.0	77.81
U/S Grade Ctrl (Thalweg) (1st u/s TC (d/s edge of ATV ford))	1	237.00	31.0	80.69

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.