Fish Passage Improvement site 20501468

Fish Passage Site 20501468

Coordinates (dec. deg.): 62.16042°, -149.93346°
Legal Description: S024N004W24
Region: South Central
Road Name: Malaspina

Datum: WGS84
Quad Name / ITM: Talkeetna Mts A-6
AWC Stream #:
Stream Name: Unnamed

Elevation:

Site Comments: None

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-MAL01

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:

Outfall height red
Culvert gradient red
Inlet perch
Mechanical damage or joints parting

Comments: Top of pipe is caved in in middle nearly to water surface in middle of pipe. Length measured by tape across road. Inlet perch formed by cobble & vegetation

Culvert Measurements

ID: 1

Structure Type: Circular pipe (Corrugated steel)

Fish Passage Rating: Red

Length(ft): 40.3

Inlet Type: Projecting

Outlet Type: Projecting

Corrugation Depth(in.): 0.5

Corrugation Width(in.): 2.67

Condition Rating(1-5): 3

Approach Angle: 41.0

Sedimentation At Inlet: Yes

Inlet Substrate: None

Outlet Substrate: None

	Inlet	Outlet
Width(ft):	2.9	2.9
Height(ft):	2.9	2.8
Apron Length(ft):
Water Depth(ft):		0.13
Rustline Height(ft):	1.5
Substrate Depth(ft):	0.0	0.0

Backwatered?: No

Baffles Present: No

Embedded?: No

Outfall Height: 0.63

Outfall Type: Cascade Over Rip-Rap

Constriction Ratio: 1.03

Culvert Gradient: 2.36%

Max Slope:

Max Slope Length:

Culvert Observations:

Outfall height red
Culvert gradient red
Inlet perch
Mechanical damage or joints parting

Stream Measurements

Stream Substrates	Upstream	Downstream
Dominant:	Silt/Clay	Cobble
Subdominant:	Cobble	Cobble

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

Stream Width Type	Distance From Crossing (ft)	Stream Width (ft)
Downstream ordinary high water	36.0	2.00
Downstream ordinary high water	72.0	4.00
Downstream ordinary high water	85.0	3.00

Elevations

Locator ID	Culvert Number	River Distance (ft)¹	Distance From Crossing (ft)²	Relative Elevation (ft)
Outlet Pool Water Elev (WS outlet pool)	1			95.70
D/S Grade Ctrl (Thalweg) (2nd GP d/s confluence of 2 channels)	1	0.00	28.0	92.66
D/S Water Surface Elev (WS at GP)	1	0.00	28.0	92.95
D/S Grade Ctrl (Thalweg) (TWC for smaller channel)	1	19.20	8.8	95.36
D/S Tailcrest or 1st Thalweg	1	22.80	5.2	95.40
D/S Water Surface Elev (WS at TWC)	1	22.80	5.2	95.66
D/S Thalweg (bottom outlet pool)	1	26.20	1.8	94.70
Outlet Invert	1	28.00	0.0	96.20
D/S Thalweg (stream bed end of pipe)	1	28.00	0.0	95.32
Road Elev	1	48.00		101.59
Inlet Culvert Invert	1	68.00	0.0	97.15
U/S Thalweg	1	68.80	0.8	97.67
U/S Grade Ctrl (Thalweg)	1	69.50	1.5	97.83
U/S Headwater (WS at top of inlet perch)	1	69.50	1.5	98.21
U/S Thalweg (u/s chan (slough) bottom)	1	79.50	11.5	95.29

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.