Fish Passage Improvement site 20501470

Fish Passage Site 20501470

Coordinates (dec. deg.): 62.28277°, -149.95096°
Legal Description: S025N004W02
Region: South Central
Road Name: Mastodon Road

Datum: WGS84
Quad Name / ITM: Talkeetna Mts B-6
AWC Stream #:
Stream Name: Birch Creek tributary

Elevation:

Site Comments: None

Survey Date: May 21, 2009

Survey PRK09-MST01

site photos

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

Overall Fish Passage Rating: Gray

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:

Site Observations:

Constriction ratio gray
Culvert gradient gray

Comments: **Updated site photos added from 9/30/16 site visit from Sampling Unmapped Streams in the MSB project. Fish sampling information entered into AFFI. ** **Updated site photos from 6/15/15 site visit*** TWC higher than Inverts = Backwatered, but steep riffle at inlet causes high velocity; overflow pipe 30ft south. Old beaver poinds 80 and 190 feet upstream.

Culvert Measurements

ID: 1

Structure Type: Circular pipe (Structural steel plate)

Fish Passage Rating: Gray

Length(ft): 39.5

Inlet Type: Projecting

Outlet Type: Projecting

Corrugation Depth(in.): 0.5

Corrugation Width(in.): 2.67

Condition Rating(1-5): 4

Approach Angle: 38.0

Sedimentation At Inlet: No

Inlet Substrate: None

Outlet Substrate: Cobble

	Inlet	Outlet
Width(ft):	5.7	5.7
Height(ft):	6.0	5.4
Apron Length(ft):
Water Depth(ft):		1.88
Rustline Height(ft):	2.9
Substrate Depth(ft):	0.0	0.6

Backwatered?: No

Baffles Present: No

Embedded?: No

Outfall Height: 0.0

Outfall Type: At Stream Grade

Constriction Ratio: 0.54

Culvert Gradient: 1.11%

Max Slope:

Max Slope Length:

Culvert Observations:

Constriction ratio gray
Culvert gradient gray

Stream Measurements

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

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

Stream Width Type	Distance From Crossing (ft)	Stream Width (ft)
Upstream ordinary high water	50.0	11.50
Upstream ordinary high water	82.0	10.00
Upstream ordinary high water	190.0	10.00

Elevations

Locator ID	Culvert Number	River Distance (ft)¹	Distance From Crossing (ft)²	Relative Elevation (ft)
Outlet Pool Water Elev	1			92.81
U/S Headwater (turbulent foot of riffle)	1			92.91
D/S Grade Ctrl (Thalweg)	1	0.00	19.0	91.36
D/S Water Surface Elev (WS at grade pt)	1	0.00	19.0	92.19
D/S Water Surface Elev (u/s)	1	2.50	16.5	93.81
D/S Water Surface Elev (WS at TWC)	1	9.00	10.0	92.80
D/S Tailcrest or 1st Thalweg	1	9.00	10.0	91.74
D/S Thalweg	1	14.00	5.0	90.61
Outlet Invert	1	19.00	0.0	90.93
Road Elev	1	38.50		99.86
Inlet Culvert Invert	1	58.00	0.0	91.37
U/S Thalweg	1	61.30	3.3	91.93
U/S Thalweg	1	68.50	10.5	92.49
U/S Thalweg (Tailcrest)	1	74.50	16.5	92.66

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.