LAKE ROOSEVELT
The Story of the Columbia Basin Project
Bureau of Reclamation Logo


DATA ON THE DAM AND PROJECT

GRAND COULEE DAM
Length at crest4,173 feet.
Height above lowest bedrock550 feet.
Height above downstream water level350 feet.
Pump lift to Feeder Canal280 feet.
Spillway width1,650 feet.
Concrete content10,585,000 cubic yards.
Excavation for dam, common20,535,422 cubic yards.
Excavation for dam, rock2,095,557 cubic yards.
Maximum concrete pour, 1 month536,264 cubic yards.

FRANKLIN D. ROOSEVELT LAKE
Area80,000 acres.
Length151 miles.
Length of shoreline600 miles.
Total capacity9,402,000 acre-feet.
Live capacity5,072,000 acre-feet.
Maximum surface elevation above sea level1,290 feet.

COLUMBIA RIVER AND TRIBUTARIES
Total drainage area258,000 square miles.
Total drainage area above Grand Coulee Dam74,100 square miles.
Drainage area in Canada39,700 square miles.
Mean annual runoff above dam77,200,000 acre-feet.
Maximum required for irrigation4,000,000 acre-feet.
Mean annual flow at dam104,150 cubic feet per second.
Maximum recorded flow at dam, 1948637,800 cubic feet per second.

POWER PLANTS
Turbines:
   (18)160,000 horsepower each.
   (3) (station service)14,000 horsepower each.
Generators:
   (18)108,000 kilowatts each.
   (3) (station service)10,000 kilowatts each.
Total rated capacity1,974,000 kilowatts.

PUMPING PLANT
Pumps (12 ultimate, 6 installed)65,000 horsepower each.
Capacity (each pump)1,600 cubic feet per second.

FEEDER CANAL
Length1.6 miles.
Capacity16,000 cubic feet per second.

EQUALIZING RESERVOIR
Length of reservoir27 miles.
Active storage761,800 acre-feet.
Water surface elevation1,570 feet.
Water surface area27,000 acre-feet (42 miles).
Maximum water depth85 feet.

NORTH DAM (earthfill)
Length1,450 feet.
Height above bedrock145 feet.

DRY FALLS DAM (earthfill)
Length9,800 feet.
Height above bedrock123 feet.
Height above ground surface80 feet.
Maximum width at base480 feet.
Volume of fill materials1,473,000 cubic yards.

MAIN CANAL TO LONG LAKE RESERVOIR
Length8 miles.
Capacity13,200 cubic feet per second.
Height of Summer Falls165 feet.

LONG LAKE DAM AND RESERVOIR (part of Main Canal)
Length of dam1,900 feet.
Height above bedrock130 feet.
Height above ground surface111 feet.
Maximum width at bottom600 feet.
Volume of fill material1,462,000 cubic yards.
Length of reservoir6.1 miles.
Live capacity22,000 acre-feet.

LONG LAKE DAM TO BIFURCATION WORKS
Length6.6 miles
Capacity9,700 cubic feet per second.
Width at water surface112 feet.
Width at base50 feet.
Water depth21 feet.

WEST CANAL
Length87 miles.
Capacity at bifurcation works5,100 cubic feet per second.

SOAP LAKE SIPHON
Length12,883 feet (2.44 miles).
Maximum diameter (high head section)22 feet 4 inches.
Head236 feet.
Difference in elevation inlet and outlet19 feet.

FRENCHMAN HILLS TUNNEL
Length9,280 feet.
Diameter14 feet.
Difference in elevation inlet and outlet13.6 feet.

EAST LOW CANAL
Length:
Present87 miles.
Ultimate130 miles.
Capacity at bifurcation works4,500 cubic feet per second.

O'SULLIVAN DAM (EARTHFILL) AND POTHOLES RESERVOIR
Length3.5 miles.
Maximum height above bedrock200 feet.
Volume of earthfill8,753,000 cubic yards.
Total capacity615,600 acre-feet.
Live capacity379,500 acre-feet.

POTHOLES CANAL
Length68 miles.
Capacity at O'Sullivan Dam:
   Present1,800 cubic feet per second.
   Ultimate3,900 cubic feet per second.

PROJECT ACREAGES
Gross area, irrigable and nonirrigable2,500,000 acres.
Irrigable area1,029,000 acres.


ACREAGE—WATER AVAILABLE BY YEARS—CUMULATIVE TOTALS
YearAcresYearAcres
19485,7901957353,508
19507,1091958359,456
195272,7531959414,129
1953131,5291960425,993
1954188,5771961440,860
1955251,2821962451,228
1956306,0601963459,425


ACREAGE—USING WATER ON CROPS—CUMULATIVE TOTALS
YearAcresYearAcres
19481191956174,788
19492,4111957203,097
19504,3531958238,312
19515,3351959266,590
195227,1271960294,195
195363,9581961314,239
1954104,3271962345,637
1955149,2291963370,322


SIZE OF FARM UNIT

Acres
Acres
Minimum10Average85
Maximum160

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Last Updated: 01-Feb-2008