Pertinent Data

US Army Corps of Engineers
Walla Walla District

Lucky Peak Master Plan
Technical Report - Volume 2
Supporting Data - Item 3

Pertinent Data

Dam

Type
Top elevation (ft/msl)
Height
- Above foundation (ft)
- Above streambed (ft)
Crest length (ft)
Width at top (ft) Rolled earth and gravel fill, impervious core
3,078

340
256
1,700
30

Spillway

Crest elevation (ft/msl)
Length (ft)
Design discharge (cfs) 3,060
600
93,300

Outlet Works

Type
Diameter of tunnel (ft)
Length of tunnel (ft)
Elevation of tunnel behind dam (ft/msl)
Discharge capacity
- At minimum lake level (cfs)
- At normal lake level (cfs)
Number and size of gates
Gate operation
Diameter of jet valve (in) Steel-lined pressure tunnel
22
1,365
2,824

17,000
30,000
Six - 5'3" x 10'0"
Hydraulic cylinders
30

Lucky Peak Lake Data

Elevation of Lake (msl)

Flood storage
Normal operating
Minimum operating
Empty (Boise River) 3060
3055
2905
2824

Area of Lake (Acres)

Normal at El. 3055
Minimum at El. 2905 3,019¹
820

Length of

Shoreline (miles) at El. 3055
Boise River (miles)
Mores Creek (miles) 45
12
5½

Storage Capacity (acre-feet)

Top 5 feet, El., 3055 to 3060
Active (usable), El. 2905 to 3055
Minimum, EL. 2824 to 2905
Total gross, El. 2824 to 3060 13,905
264,371
28,767
307,043

Water Allocation (acre-feet)²

Contracted irrigation
Streamflow maintenance
Storage for recreation 111,950
152,300
28,800

¹See SD-8 for calculations.
²As shown in Idaho Department of Water Resources Permit No. 63-3618/R-1183.

Return to the Supporting Data Table of Contents

blaise.g.grden@usace.army.mil

Dam
Type Top elevation (ft/msl) Height - Above foundation (ft) - Above streambed (ft) Crest length (ft) Width at top (ft)	Rolled earth and gravel fill, impervious core 3,078 340 256 1,700 30
Spillway
Crest elevation (ft/msl) Length (ft) Design discharge (cfs)	3,060 600 93,300
Outlet Works
Type Diameter of tunnel (ft) Length of tunnel (ft) Elevation of tunnel behind dam (ft/msl) Discharge capacity - At minimum lake level (cfs) - At normal lake level (cfs) Number and size of gates Gate operation Diameter of jet valve (in)	Steel-lined pressure tunnel 22 1,365 2,824 17,000 30,000 Six - 5'3" x 10'0" Hydraulic cylinders 30
Lucky Peak Lake Data
Elevation of Lake (msl)
Flood storage Normal operating Minimum operating Empty (Boise River)	3060 3055 2905 2824
Area of Lake (Acres)
Normal at El. 3055 Minimum at El. 2905	3,019¹ 820
Length of
Shoreline (miles) at El. 3055 Boise River (miles) Mores Creek (miles)	45 12 5½
Storage Capacity (acre-feet)
Top 5 feet, El., 3055 to 3060 Active (usable), El. 2905 to 3055 Minimum, EL. 2824 to 2905 Total gross, El. 2824 to 3060	13,905 264,371 28,767 307,043
Water Allocation (acre-feet)²
Contracted irrigation Streamflow maintenance Storage for recreation	111,950 152,300 28,800
¹See SD-8 for calculations. ²As shown in Idaho Department of Water Resources Permit No. 63-3618/R-1183.