Fish Passage Improvement site 20303756

Fish Passage Site 20303756

Coordinates (dec. deg.): 60.53950°, -150.73605°
Legal Description: S005N008W08
Region: South Central
Road Name: Otter Trail Road

Datum: NAD83
Quad Name / ITM: Kenai C-2
AWC Stream #: 244-30-10010-2063-3002
Stream Name: Unnamed

Elevation:

Site Comments: 1st culvert on Otter Trail Road.

Survey Date: Jun 02, 2017

Survey KEN17-OTR02

site photos

Observers: Elise Idle, Maggie Schaffer

Overall Fish Passage Rating: Gray

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:

Site Observations:

Culvert gradient red

Comments: Assessment information collected and submitted by USFWS. Stream becomes densely covered over by grass upstream and downstream from site. Upstream water surface elevations inconsistent, but looks like water surface fairly flat above and below culvert. Channel becomes covered with vegetation as you move upstream and downstream from the crossing.

Culvert Measurements

ID: 1

Structure Type: Circular pipe (Corrugated steel)

Fish Passage Rating: Gray

Length(ft): 45.5

Inlet Type: Projecting

Outlet Type: Projecting

Corrugation Depth(in.): 1.0

Corrugation Width(in.): 3.0

Condition Rating(1-5): 4

Approach Angle: 26.0

Sedimentation At Inlet: Yes

Inlet Substrate: Cobble

Outlet Substrate: Cobble

	Inlet	Outlet
Width(ft):	6.5	6.5
Height(ft):	4.4	4.0
Apron Length(ft):
Water Depth(ft):		0.45
Rustline Height(ft):	0.9
Substrate Depth(ft):	2.1	2.5

Backwatered?: No

Baffles Present: No

Embedded?: Yes

Embedded Depth(ft): 21.0

Outfall Height: 0.0

Outfall Type: At Stream Grade

Constriction Ratio: 1.45

Culvert Gradient: 2.33%

Max Slope:

Max Slope Length:

Comments: Water surface gradient through culvert 1.08%, substrate gradient through culvert 1.52%.

Culvert Observations:

Culvert gradient red

Stream Measurements

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

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

Stream Width Type	Distance From Crossing (ft)	Stream Width (ft)
Downstream ordinary high water	22.0	1.50
Downstream ordinary high water	77.0	3.70
Downstream ordinary high water	109.0	2.60
Upstream ordinary high water	18.0	6.30
Upstream ordinary high water	43.0	3.70
Upstream ordinary high water	62.0	4.50
Upstream ordinary high water	82.0	3.40

Elevations

Locator ID	River Distance (ft)¹	Relative Elevation (ft)
Road Elev		101.35
U/S Thalweg	0.00	94.89
U/S Water Surface Elev	0.00	95.70
U/S Water Surface Elev	21.00	95.74
U/S Thalweg	21.00	94.82
U/S Water Surface Elev	39.00	95.78
U/S Thalweg	39.00	94.94
U/S Water Surface Elev	64.00	95.80
U/S Thalweg	64.00	94.06
U/S Water Surface Elev	82.00	95.77
Inlet Culvert Invert (on substrate)	82.00	95.52
Inlet Culvert Top	82.00	100.00
Outlet Culvert Top	127.50	98.94
D/S Water Surface Elev (on substrate)	127.50	95.28
Outlet Invert	127.50	94.83
D/S Thalweg (Start of riffle)	140.50	94.76
D/S Water Surface Elev	140.50	95.18
D/S Grade Ctrl (Thalweg) (Top of log in stream)	157.50	94.80
D/S Grade Ctrl (Thalweg) (Log in stream)	157.50	94.80
D/S Grade Ctrl (Thalweg) (Bottom of Log in stream)	157.50	94.50
D/S Grade Ctrl (Thalweg) (Log in stream)	157.50	94.50
D/S Water Surface Elev	173.50	94.35
D/S Thalweg (End of riffle)	173.50	93.64

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): 1.75
Comments: Trap set about 80 feet upstream

Gear Type: Minnow Trap (B)		Trap Duration(h): 1.5
Comments: Trap set about 80 feet downstream

Fish Observations

No fish observations occurred during this survey.

Photos

Questions or comments about this report can be directed to dfg.dsf.webmaster@alaska.gov