Fish Passage Improvement site 20501207

Fish Passage Site 20501207

Coordinates (dec. deg.): 61.74695°, -149.23218°
Legal Description: S019N001E11
Region: South Central
Road Name: Palmer Fishhook Road

Datum: WGS84
Quad Name / ITM: Anchorage C-6
AWC Stream #:
Stream Name: Little Susitna River tributary

Elevation:

Site Comments: Confluence with Little Su almost directly downstream from outlet.

Survey Date: Jul 21, 2009

Survey MSB09-PFR02

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:

Culvert gradient red
Outfall height gray
Constriction ratio gray
Shallow fill; inadequate roadfill volume above culvert

Comments: **Updated site photos and fish sampling information added from 9/28/16 site visit from Sampling Unmapped Streams in the MSB project. Nice Dolly Varden habitat up to barrier falls, no fish captured or observed.

Culvert Measurements

ID: 1

Structure Type: Circular pipe (Corrugated steel)

Fish Passage Rating: Red

Length(ft): 49.5

Inlet Type: Projecting

Outlet Type: Projecting

Corrugation Depth(in.): 0.5

Corrugation Width(in.): 2.67

Condition Rating(1-5): 3

Approach Angle: 19.0

Sedimentation At Inlet: No

Inlet Substrate: None

Outlet Substrate: None

	Inlet	Outlet
Width(ft):	4.3	4.3
Height(ft):	4.5	4.7
Apron Length(ft):
Water Depth(ft):		0.35
Rustline Height(ft):	1.2
Substrate Depth(ft):	0.0	0.0

Backwatered?: No

Baffles Present: No

Embedded?: No

Outfall Height: 0.19

Outfall Type: Free Fall In To Pool

Constriction Ratio: 0.53

Culvert Gradient: 5.98%

Max Slope:

Max Slope Length:

Culvert Observations:

Culvert gradient red
Outfall height gray
Constriction ratio gray
Shallow fill; inadequate roadfill volume above culvert

Stream Measurements

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

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

Stream Width Type	Distance From Crossing (ft)	Stream Width (ft)
Upstream ordinary high water	78.0	9.50
Upstream ordinary high water	101.0	6.50
Upstream ordinary high water	132.0	8.00

Elevations

Locator ID	Culvert Number	River Distance (ft)¹	Distance From Crossing (ft)²	Relative Elevation (ft)
D/S Grade Ctrl (Thalweg)	1	0.00	19.0	91.64
D/S Water Surface Elev	1	0.00	19.0	92.33
D/S Tailcrest or 1st Thalweg	1	10.50	8.5	92.33
D/S Water Surface Elev	1	10.50	8.5	92.72
D/S Thalweg (bottom of pool)	1	14.20	4.8	91.33
Outlet Invert	1	19.00	0.0	92.56
Outlet Pool Water Elev	1	19.00		92.72
Road Elev	1	43.50		100.12
Inlet Culvert Invert	1	68.50	0.0	95.52
U/S Headwater	1	68.50		96.07
U/S Grade Ctrl (Thalweg) (TC of 1st pool u/s)	1	74.50	6.0	96.49
U/S Water Surface Elev	1	74.50	6.0	96.95

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.