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The Glen Canyon National Recreation Area (NRA) was established in 1972 and covers more than one million acres of dramatic desert and canyon country around the 185-mile- (298 km) long Lake Powell. The lake was created by damming the Colorado River. The recreation area is "Y"-shaped, following the San Juan River east almost to the town of Mexican hat and heading northeast toward Canyonlands National Park. Today, the lake is busy with watersports enthusiasts, although a prolonged drought has lowered the lake level recently so you should call ahead for boat launch information. Glen Canyon is also one of the most popular hiking, biking and 4WD destinations in the US.
from: http://ezinearticles.com/?Lake-Powell-And-Glen-Canyon-National-Recreation-Area&id=6502115
