Fish Passage Improvement site 20401290

Fish Passage Site 20401290

Coordinates (dec. deg.): 61.52802°, -149.50688°
Legal Description: S017N001W29
Region: South Central
Road Name: Fairview Loop Road

Datum: NAD83
Quad Name / ITM: Anchorage C-7
AWC Stream #: 247-50-10300-2012
Stream Name: Cottonwood Slough

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 MSCS1-CT139

site photos

Observers: Edward Weiss, Doug Hill

Overall Fish Passage Rating:

Tidal: No
Backwatered: No

Step Pools:
Construction Year:

Comments: Original culv extended, upper 6' of culvert slightly different gradient, no substrate in 6' portion, apprears to have substrate below the 6';5-16' ATV crossing;0-53' powerline/rd cut clearing modified;54' natural

Culvert Measurements

ID: 1

Structure Type: Circular pipe (Corrugated steel)

Fish Passage Rating:

Length(ft): 47.0

Inlet Type: Projecting

Outlet Type:

Corrugation Depth(in.): 0.5

Corrugation Width(in.): 2.67

Condition Rating(1-5):

Approach Angle:

Sedimentation At Inlet:

Inlet Substrate: Cobble

Outlet Substrate: Gravel

	Inlet	Outlet
Width(ft):	3.0	3.0
Height(ft):	3.0	2.52
Apron Length(ft):
Water Depth(ft):	0.59	0.43
Rustline Height(ft):
Substrate Depth(ft):	0.0	0.48

Backwatered?:

Baffles Present: No

Embedded?: No

Outfall Height:

Outfall Type:

Constriction Ratio:

Culvert Gradient:

Max Slope:

Max Slope Length:

Culvert Observations:

Improper bedding

Stream Measurements

Stream Substrates	Upstream	Downstream
Dominant:	Cobble	Gravel
Subdominant:

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

Stream Width Type	Distance From Crossing (ft)	Stream Width (ft)
Downstream ordinary high water	54.0	5.00
Downstream ordinary high water	100.0	5.00
Upstream ordinary high water	43.0	5.00
Upstream ordinary high water	58.0	4.50

Elevations

Locator ID	Culvert Number	River Distance (ft)¹	Distance From Crossing (ft)²	Relative Elevation (ft)
Outlet Culvert Top	1			92.45
Inlet Culvert Top	1			93.98
D/S Thalweg		0.00	100.0	88.61
D/S Thalweg		46.00	54.0	88.73
Outlet Invert	1	100.00	0.0	89.86
Outlet Thalweg	1	100.00	0.0	89.95
Road Elev		123.50		95.44
Road Elev		123.50		95.54
Inlet Thalweg	1	147.00	0.0	90.73
Inlet Culvert Invert	1	147.00	0.0	90.99
U/S Thalweg		153.00	6.0	90.23
U/S Thalweg		206.00	59.0	91.75
U/S Thalweg		225.00	78.0	92.28

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.

Fish Sampling Efforts

Gear Type: Minnow Trap (A)		Trap Duration(h): -3

Gear Type: Minnow Trap (B)		Trap Duration(h): -3

Fish Observations

Species: juvenile coho salmon		Life History: Anadromous
Total Fish Observed: 22	Fish Measured: 16	Fork Lengths (mm) Min: 65 Max: 105 Mean: 79
Collected/Observed by Gear Type: Downstream Minnow Trap (10) Upstream Minnow Trap (12)

Photos

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