History - The 2002 Flood

The flood beginning July 4, 2002 was the first time that floodwaters flowed over the Emergency Spillway since the Reservoir was completed in 1964.

The upper part of the Guadalupe River Watershed officially received 34 inches of rain in approximately one week. (see the Canyon Lake section below for more info)

All lakeside and River Road campers were evacuated and parks closed.

When the floodwater was at peak flow, it was moving at about 67,000 cubic feet per second (cfs) approximately 7 feet above the Spillway. Normal flow from the reservoir is 350 cfs with a maximum release of 5000 cfs.

Just under 1-1/2 times the amount of water stored in the lake (at normal level) went over the Spillway during the flood event.

Water continued to flow over the Spillway for approximately 6 weeks. Rocks, trees, logs, and other flood debris piled up in the Guadalupe River and created a huge blockage. Flooding continued from the dam to the Gulf Coast.

Canyon Lake

Canyon Dam and Reservoir, located on the Guadalupe River, Comal County, is a joint project between the U.S. Army Corps of Engineers and the Guadalupe-Blanco River Authority.

The dam was built for two reasons:
1) to control flood events that originated in the watershed of the Guadalupe River in the Texas Hill Country.
2) for GBRA to have a stored supply of water available for citizens in the Guadalupe River Basin during times of drought.

Built in the early 1960's, the dam is constructed of rolled, compacted earth. The Reservoir took three years to fill to its optimal level.

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© 1998 Guadalupe-Blanco River Authority