Fish Passage Improvement site 20301017

Fish Passage Site 20301017

Coordinates (dec. deg.): 59.66915°, -151.66990°
Legal Description: S006S014W09
Region: South Central
Road Name: Sterling Highway

Datum: NAD83
Quad Name / ITM: Seldovia C-5
AWC Stream #:
Stream Name: Diamond Creek

Elevation:

Site Comments: None

Survey Date: Jul 10, 2001

Survey KPCS1-SK026

site photos

Observers: Cecil Rich, Michael Lund

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools:
Construction Year:

Comments: Evidence of past erosion around right side of inlet headwall. Six inch perch at outlet, flexed down.

Culvert Measurements

ID: 1

Structure Type: Closed-bottom arch (Strutural Metal Plate)

Fish Passage Rating:

Length(ft): 110.55

Inlet Type: Headwall

Outlet Type:

Corrugation Depth(in.): 2.0

Corrugation Width(in.): 6.0

Condition Rating(1-5):

Approach Angle:

Sedimentation At Inlet:

Inlet Substrate: None

Outlet Substrate: None

	Inlet	Outlet
Width(ft):	7.6	7.0
Height(ft):	8.3	9.7
Apron Length(ft):
Water Depth(ft):	0.5	0.62
Rustline Height(ft):
Substrate Depth(ft):	0.0	0.0

Backwatered?:

Baffles Present: No

Embedded?: No

Outfall Height: 0.77

Outfall Type:

Constriction Ratio: 0.75

Culvert Gradient: 3.40%

Max Slope:

Max Slope Length:

Culvert Observations:

None of this type

Stream Measurements

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

Stream Slope(deg.):
Stream Flow Stage:

Stream Width Type	Distance From Crossing (ft)	Stream Width (ft)
Downstream ordinary high water	33.0	12.90
Downstream ordinary high water	92.0	11.80
Downstream ordinary high water	138.0	12.00
Upstream ordinary high water	5.0	21.90
Upstream ordinary high water	36.0	10.50
Upstream ordinary high water	66.0	9.70

Elevations

Locator ID	Culvert Number	River Distance (ft)¹	Distance From Crossing (ft)²	Relative Elevation (ft)
D/S Thalweg		0.00	138.0	86.54
D/S OHW Elev		0.00	138.0	87.83
D/S Water Surface Elev		0.00	138.0	87.21
D/S Thalweg		46.00	92.0	87.37
D/S Water Surface Elev		46.00	92.0	87.85
D/S OHW Elev		46.00	92.0	88.90
OHW Left Bank		105.00	33.0	89.45
D/S Water Surface Elev		105.00	33.0	88.62
D/S Tailcrest or 1st Thalweg		105.00	33.0	87.67
OHW Left Bank		133.00	5.0	88.66
Max Pool Depth		133.00	5.0	85.23
D/S Thalweg		133.00	5.0	85.23
OHW Left Bank		133.00	5.0	89.58
Outlet Rustline Height	1	138.00	0.0	90.87
Outlet Thalweg	1	138.00	0.0	86.75
Outlet Invert	1	138.00	0.0	88.81
Outlet Culvert Top	1	138.00	0.0	98.50
Road Elev		193.00		115.33
Road Elev		193.00		115.46
Inlet Culvert Top	1	248.00	0.0	100.89
Inlet Thalweg	1	248.00	0.0	92.21
Inlet Rustline Height	1	248.00	0.0	92.40
Inlet Culvert Invert	1	248.00	0.0	92.57
U/S Thalweg	1	249.00	1.0	91.98
U/S Thalweg	1	253.00	5.0	92.17
U/S OHW elevation	1	253.00	5.0	93.07
U/S Water Surface Elev	1	253.00	5.0	93.07
U/S Thalweg	1	263.00	15.0	92.04
U/S Thalweg		314.00	66.0	92.79
U/S Water Surface Elev		314.00	66.0	94.23
U/S Headwater		314.00	66.0	94.94
U/S Water Surface Elev		384.00	136.0	95.02
U/S Headwater		384.00	136.0	95.23
U/S Thalweg		384.00	136.0	94.61

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): 2.1

Gear Type: Minnow Trap (B)		Trap Duration(h): 2.35

Fish Observations

Species: juvenile Dolly Varden		Life History: Resident
Total Fish Observed: 51	Fish Measured: 18	Fork Lengths (mm) Min: 72 Max: 158 Mean: 119
Collected/Observed by Gear Type: Downstream Minnow Trap (35) Upstream Minnow Trap (16)

Photos

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