Staying Safe Flood Guide - Guadalupe-Blanco River Authority

Structural Management
The Guadalupe-Blanco River Authority was created by the Texas Legislature in 1935 to
develop, conserve and protect the water resources of the Guadalupe River Basin. In
the 1950's, plans were finalized to build Canyon Dam and Reservoir on the main stem of
the Guadalupe River near Sattler. Canyon Dam is the only flood control dam located on
the Guadalupe River.
Canyon Dam and Reservoir
This dual-purpose reservoir was completed in 1963 through a cooperative effort
between GBRA and the U.S. Army Corps of Engineers, with GBRA serving as local sponsor
for the project. Canyon Reservoir provides flood control benefits and also serves as a
dependable source of stored water.
The dam is an earthfill embankment 224 feet high and 6,830 feet long. The reservoir
behind the dam is best understood by thinking of it as a two-part storage chamber. The
lower portion, or Conservation Pool, extends from elevation 800 to 909 feet mean sea
level (msl) and stores water for cities, industries and agricultural users downstream of
Canyon Dam. GBRA is responsible for the Conservation Pool and, under a TNRCC permit,
is authorized to divert a specific amount of stored water each year to supply contracted
water users.
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