WESTERN AREA MASTER PLAN APPENDIX A. Tabular Data

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WESTERN AREA MASTER PLAN

APPENDIX A Tabular Data

Minnesota, South Dakota 2021

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Lake Traverse

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Reservoir Flowage rights To elevation 983.0 NGDV*

Water surface elevation at full pool 981.0 NGVD Water surface elevation at maximum pool 982.0 NGVD Capacity at full pool (981.0) 85,000 acre-feet Capacity at maximum pool (982.0) 95,500 acre-feet Capacity at conservation pool (972.0) 3,850 acres Reservoir area at full pool (981.0) 10,550 acres Reservoir area at maximum pool (982.0) 10,725 acres Reservoir length at conservation pool 7.5 miles Maximum reservoir width at conservation

pool 2.5 miles

Dam Type Rolled earth fill

Crest elevation 980.0 NGVD

Total length of earth embankment 14,000 feet

Top width (roadway) 26 feet

Maximum height 16 feet

Freeboard above spillway design flood

height 4 feet

Total volume of earth dam 329,200 cubic yards

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Spillway Type Gated concrete sill

Elevation top of tainter gates (closed) 981.0 NGVD

Design discharge 5,600 cubic feet per second

Stilling

basin Type Concrete apron with dentated

sill

Length 34.07 feet

Maximum width at end of sill 47 feet Elevation of still basin floor 960.0 NGVD

*All elevations are in feet, National Geodetic Vertical Datum (NGVD)

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Reservoir Flowage rights To elevation 983.0 NGVD

Water surface elevation at full pool 981.0 NGVD Water surface elevation at design flood 982.0 NGVD Capacity at full pool (981.0) 164,500 acre-feet Capacity at maximum pool (982.0) 177,500 acre-feet Capacity at conservation pool (976.0) 106,000 acre-feet Reservoir area at conservation pool (976.0) 10,925 acres Reservoir area at full pool (981.0) 12,425 acres Reservoir area at maximum pool (982.0) 12,700 acres Maximum reservoir width at conservation

pool 1 ¾ miles

Average depth 13.2 feet

Total length of earth embankment (spillway) 9,100 feet

Top width (roadway) 26 feet

Maximum height 14.5 feet

Total volume of earth dam 188,000 cubic yards

Spillway Type Grouted riprap weir

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Crest elevation 974.0 NGVD Net length of spillway crest 101.5 feet Number of stop log sections 17

Width of sections (clear opening) 15 sections – 6 by 2 feet 2 sections – 5.75 by 2 feet Elevation top of stop logs 976.0 feet NGVD

Maximum discharge (design flood) 5,600 cubic feet per second

Elevation of walkway over spillway 981.0 feet NGVD

Outlet conduits Size and length (plugged with removable

plugs) 2 24-inch by 14-feet

Invert elevation (intake and outfall) 970.0 feet NGVD Discharge capacity with pool at conservation

level 80 cubic feet per second

Control (inoperative) 2 Calco slide gates

Stilling basin Type Grouted derrick stone

Length 27.5 feet

Maximum width at end section 150 feet

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Dike Type Rolled earth fill

Crest elevation (earth dike section) 978.0 feet NGVD Crest elevation (culvert section) 986.5 feet NGVD Total length of earth embankment 3,700 feet

Top width 10 feet

Freeboard above spillway design flood 5 feet

Total volume earth dike ~93,000 cubic yards

Culvert Type Concrete bay

Size 3 6x9 foot openings

Length 68.75 feet

Invert elevation (reservoir side) 971.0 feet NGVD Invert elevation (Little Minnesota River side) 974.0 feet NGVD

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Lake Orwell

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Crest elevation 1080 feet NGVD

Top width 20 feet

Length of earth fill 1,355 feet

Embankment side slopes 1 on 3

Total volume of earth fill 168,165 cubic yards Freeboard above maximum elevation of

spillway design flood 5 feet

Reservoir Pool elevation at spillway design flood 1075 feet NGVD Capacity at spillway design flood elevation 14,100 acre-feet Normal full pool elevation 1064 feet NGVD Capacity at normal full pool 8,600 acre-feet Reservoir area at normal full pool 990 acres

Normal low pool elevation 1048 feet NGVD

Capacity at normal low pool 1,000 acre-feet Reservoir area at normal low pool 210 acres

Fee title to elevation ± 1073 feet NGVD

Effective storage capacity 11,000 acre-feet

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Reservoir length at normal full pool 4 miles Reservoir maximum width at normal full pool

1 mile

Dikes Number 2

Total length 1,140 feet

Total volume of earth fill 9,520 cubic yards

Spillway Type Gated ogee and

chute

Length of spillway crest 33 feet

Elevation top of tainter gate (closed) 1071.5 feet NGVD Design discharge (surcharge 5 feet) 20,400 second feet Volume of concrete in structure 9,310 cubic yards

Low water control

outlet works Size 2-foot inside

diameter

Number 2

Invert elevation 1040 feet NGVD

Discharge capacity (total for both gates) at

normal full pool (1070) 150 second-feet

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Gates 2 hand operated 24- inch AWWA

M&H iron body double disc gate valves

Tailwater control

structure Type 5 box culverts

15.5 feet by 15.5 feet

40 feet long

Invert elevation 1032.5 feet NGVD

Embankment 765-feet long

Earthen

1V:3H side slopes 20 feet max height

Stilling basin Type Flared

Length 72 feet

Floor elevation 1024.5 feet NGVD

Elevation of end sill 1032.5 feet NGVD

Maximum width at end sill 78.5 feet

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Highway 75 Dam

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Outlet control

structure Top of control structure, abutments

elevation 942.7 feet NGVD

Spillway crest elevation 960.7 feet NGVD Conservation pool elevation 964.7 feet NGVD

Slide gates 8

Size of gates 10 feet 10 inches x 7 feet

Low-flow gated openings 4 foot x 4 foot slide gate Drainage area above damsite 1,160 square miles Maximum flood (1952) discharge 3,060 cubic yards per

second

Maximum pool stage (1952) elevation 970.4 feet NGVD Top of earth embankment elevation 972.5 to 975.0 feet

NGVD

Silt barrier Type Steel sheet piling

Length of spillway section 200 feet

Crest elevation of spillway section 964.7 feet NGVD

Low flow control Slide gated 18 inch

diameter CMP

Debris barrier Type Steel pilings and wood

on floating boom

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Real estate Taking line elevation 959.5 feet NGVD

Fee acquisition land 10,794.63 acres

Cost $2,110,314.50

Easement land 104.84 acres

Cost $4,750.00

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Lac qui Parle

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General River Minnesota

Dam at river mile 303.5

Drainage area 2,800 square miles

Length 11,800 feet

Top elevation (varies) 948.6 to 952.6 feet NGVD

Top width 10 feet

Reservoir Maximum pool elevation 943.78 feet NGVD

Conservation pool elevation 937.6 feet NGVD

Full pool elevation 941.1 feet NGVD

Capacity at conservation pool 12,050 acre-feet Capacity at full pool 35,000 acre-feet Elevation at gage zero’s (msl 1929 Adj.) 900

Control structure Type Concrete gravity overflow

Length 112 feet

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Crest elevation 937.6 feet NGVD

Low water control Concrete conduit

Size 2 x 2 square feet

Length 17 feet

Control 2 x 2 feet vertical lift gate

Sill elevation 932.6 feet NGVD

Stilling basin Bucket type

Bottom elevation 924.6 feet NGVD

Emergency spillway Type Earth fill – grouted riprap

Length 90 feet

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General River Chippewa

Dam at river mile 11.3

Drainage area 2,050 square miles

Maximum discharge 3,840 cubic feet per second Maximum flow diverted into

Lac qui Parle 3,100 cubic feet per second Elevation of gage zero’s 900.00 NGVD

Total length (includes dam and

all dikes) 17,975 feet

Top elevation 950.3 feet NGVD

Top width 32 feet

Control structure Type Concrete, modified ogee

Length between abutments 147 feet

Number of bays 5

Length of each bay 27 feet Fixed crest elevation (bays 1,

2, 4 and 5) 942.3 feet NGVD

Tainter gate (bay 3) 27 feet – operation by fixed electrical gate lifter

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Gate sill elevation 932.8 feet NGVD Elevation top of gate (closed) 942.3 feet NGVD Stilling basin elevation (bays 1,

2, 4 and 5) 934.3 feet NGVD

Stilling basin elevation (bay 3) 932 feet NGVD

Bridge over control

structure Roadway elevation 950.55 feet NGVD

Roadway width 23 feet

Elevation top of abutments 950.3 feet NGVD Elevation top of curb 950.8 feet NGVD Elevation low concrete 947.8 feet NGVD

Low water control

structure Type Concrete conduit

Size 4 x 4 feet

Length 90.4 feet

Entrance invert 933.3 feet NGVD

Exit invert 932.8 feet NGVD

Gate (vertical slide) 4 x 4 feet

Diversion channel Length 3,500 feet

Bottom width 160 feet

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Bottom elevation 934.3 feet NGVD

Side slopes 1 on 3

Dikes Location (left or south bank) Diversion channel

Type Rolled earth fill

Top elevation (varies) 946.3 – 947.8 feet NGVD

Top width 10 feet

Side slope (channel side) 1 on 3 Side slope (land side) 1 on 4

Weir Type Concrete, modified ogee

Length between abutments 177 feet

Number of bays 6

Length of bays 27 feet

Fixed crest elevation 938.8 feet NGVD Stilling basin elevation 932.3 feet NGVD Elevation of gage zero (msl

1929 Adj.) 900 feet NGVD

Bridge over weir Roadway elevation 950 feet NGVD

Elevation top of abutments 949.8 feet NGVD

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Elevation top of curb 950.25 feet NGVD Elevation low concrete 947.25 feet NGVD

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General River Minnesota

Dam at river mile 288.1 Drainage area excluding

Chippewa River 4,050 square miles Drainage area including

Chippewa River 6,100 square miles

Crest elevation 946 feet NGVD Length (includes emergency

spillway section) 4,100 (±) feet Freeboard above full pool 4.9 feet

Upstream slope 1 on 3

Downstream slope 1 on 4

Reservoir Maximum pool elevation 941.95 NGVD Elevation of gage zeros 900.00 NGVD Conservation pool elevation 931.2 NGVD Full pool elevation 941.1 NGVD Capacity at conservation

pool 29,700 acre feet

Capacity at full pool 122,800 acre feet

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Control structure Type Concrete Length between abutments 237 feet

Elevation top of abutments 946.7 feet NGVD Elevation top of piers 944.28 feet NGVD

Sluiceways Number of bays 12

Bays 8 – 12 Steel bulkheads

Number bulkhead section 15

Sill elevation 934.2 feet NGVD Elevation top of bulkheads

(closed) 940.7 feet NGVD

Bulkhead size 5.5 x 6.5 feet

Bays 5 – 7 Uncontrolled

Crest elevation 934.2 feet NGVD

Length (each) 17 feet

Bays 1, 3 and 4 Lift gates operated by fixed electrical gate lifters or by hand

Number of gates 6

Size 6 x 8 feet

Sill elevation 922.7 NGVD

Bay 2 (low water control) Lift gate operated by fixed electrical gate lifter or by hand

Number of gates 3

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Size 4 x 4 feet

Sill elevation 915.2 NGVD

Stilling basin Type Concrete

Length 42 to 60 feet

Width 237 feet

Bays 8 – 12 923.2 NGVD

Bays 5 – 7 918.7 NGVD

Bays 1 – 4 914.2 NGVD

Elevation of gate zeros 900.0 NGVD

Bridge over control

structure Elevation of roadway 946.2 NGVD

Elevation of walkway 946.7 NGVD

Emergency

spillway Type Earth fill with concrete core wall and

bituminous surfaced roadway

Length 2,500 feet

Crest elevation ± 941.1 NGVD

Upstream embankment

slope 1 on 3

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Downstream (grouted riprap) 1 on 2

WESTERN AREA MASTER PLAN APPENDIX A. Tabular Data