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.
Visit the Corps of Engineers website for more info about Canyon Lake and current lake levels.
Also visit the GBRA website to learn more about their vital role in protecting not only Canyon Lake, but all the water resources in it's 10-county statutory district, which begins near the headwaters of the Guadalupe and Blanco rivers, and ends at San Antonio Bay.
Canyon Reservoir Facts:
Surface area of 8230 acres at normal level (909 msl*) and can store approximate 378,852 acre-feet** of water.
When over 909 msl, the Corps regulates how much water is released back into the Guadalupe River from the lake.
When 909 msl or below, GBRA regulates the discharge.
The dam is 224' high and 6,830' long. The top of the dam is at 974 msl.
The top of the emergency spillway is 943 msl.
Various parks are located around the reservoir, and are operated by the Corps.
Headwaters of the Guadalupe River are north of Kerrville and runs approximately 420 miles to the San Antonio Bay in the Gulf of Mexico.
* msl = mean sea level / feet above sea level
** acre-feet (a/f) = one acre at one foot of water