Fish Passage Improvement site 20203737

Fish Passage Site 20203737

Coordinates (dec. deg.): 60.15519°, -149.42830°
Legal Description: S001N001W27
Region: South Central
Road Name: Driveway

Datum: NAD83
Quad Name / ITM: Seward A-7
AWC Stream #: 231-30-10080-2010-3029-4015
Stream Name: Unnamed

Elevation:

Site Comments: Site is on a driveway off of Old Exit Glacier Road

Survey Date: Aug 10, 2017

Survey KEN17-83_2007

site photos

Observers: Luke Violette, Louis Mitchell, Mary Richardson

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: Maybe

Step Pools: No
Construction Year:

Site Observations:

Constriction ratio red
Culvert gradient red
Hydraulic flows exceeded capacity

Comments: KWFRES_17_23. Water surface elevations are inconsistent and site may be backwatered, but photos inconclusive on flow. Culvert is undersized.

Culvert Measurements

ID: 1

Structure Type: Circular pipe (Corrugated steel)

Fish Passage Rating: Red

Length(ft): 20.4

Inlet Type: Projecting

Outlet Type: Projecting

Corrugation Depth(in.): 0.5

Corrugation Width(in.): 3.0

Condition Rating(1-5): 3

Approach Angle: 0.0

Sedimentation At Inlet: Yes

Inlet Substrate: Silt/Clay

Outlet Substrate: None

	Inlet	Outlet
Width(ft):	2.25	2.66
Height(ft):	2.33	2.42
Apron Length(ft):
Water Depth(ft):		1.37
Rustline Height(ft):	1.33
Substrate Depth(ft):	0.25	0.0

Backwatered?: Maybe

Baffles Present: No

Embedded?: No

Outfall Height: 0.0

Outfall Type: At Stream Grade

Constriction Ratio: 0.23

Culvert Gradient:

Max Slope:

Max Slope Length:

Comments: Invert gradient 1.42%, water surface gradient through culvert 0.34% (although water surface elevations are not very consistant in long profile)

Culvert Observations:

Constriction ratio red
Culvert gradient red
Hydraulic flows exceeded capacity

Stream Measurements

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

Stream Slope(deg.):	0.26
Stream Flow Stage:	Medium

Stream Width Type	Distance From Crossing (ft)	Stream Width (ft)
Downstream ordinary high water	20.0	9.50
Downstream ordinary high water	40.0	10.25
Downstream ordinary high water	70.0	12.00
Upstream ordinary high water	20.0	9.00
Upstream ordinary high water	40.0	10.25
Upstream ordinary high water	60.0	9.00
Upstream ordinary high water	80.0	11.00

Elevations

Locator ID	River Distance (ft)¹	Relative Elevation (ft)
Road Elev		100.24
D/S Thalweg	0.00	97.46
D/S Water Surface Elev	0.00	98.02
D/S Water Surface Elev	20.00	98.04
D/S Thalweg	20.00	96.44
D/S Thalweg	60.00	97.23
D/S Water Surface Elev	60.00	96.94
Max Pool Depth	87.00	96.94
Outlet Pool Water Elev	87.00	96.94
Outlet Invert	100.00	96.66
D/S Water Surface Elev	100.00	98.05
Outlet Culvert Top	100.00	99.08
Inlet Culvert Top	120.40	98.41
U/S Water Surface Elev	120.40	98.10
Inlet Culvert Invert (on substrate)	120.40	96.95
U/S Thalweg (inlet pool)	122.40	96.99
U/S Water Surface Elev	122.40	97.91
U/S Thalweg	135.40	97.46
U/S Water Surface Elev	135.40	98.10
U/S Water Surface Elev	175.40	98.08
U/S Thalweg	175.40	97.27
U/S Grade Ctrl (Thalweg)	210.40	97.94
U/S Water Surface Elev	210.40	98.28
U/S Water Surface Elev	260.40	98.37
U/S Thalweg	260.40	98.04
U/S Thalweg	310.40	97.58
U/S Water Surface Elev	310.40	98.43

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): 1.25
Comments: Trap set about 60 feet downstream.

Gear Type: Minnow Trap (B)		Trap Duration(h): 1.25

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