Water School

DeCordova Bend Dam and Lake Granbury were constructed by the Brazos River Authority and are maintained and operated by the BRA as a source of water supply.Construction of the project began in December 1966 and was completed in September 1969. The reservoir provides 136,326 acre-feet of storage capacity for conservation of flood and storm waters to meet the requirements of municipalities, industries, agriculture, and mining.  The reservoir has a permitted yield of 64,712 acre feet. ...

Lake Limestone, located on the upper Navasota River in Limestone, Robertson and Leon counties, is a water supply reservoir built by the Brazos River Authority in 1978. Construction of the reservoir was made possible through the sale of water to Texas Electric Utilities to be used by their lignite-burning electric plants in the area. To view a copy of the Lake Limestone state permit, click here.Water from the reservoir is supplied for similar use at a NRG steam-electric plant just east of Lake Li...

A variety of maps of the Brazos basin can be found on the BRA’s website by clicking here.

Floodgates are solid metal barriers in a dam that can be opened to release flood waters downstream.

Constant level is a term given to the practice of maintaining a body of water at a specific elevation.  No natural body of water has a constant level.  While some fluctuate more than others, all-natural bodies of water change on a daily basis, some rapidly during floods.Few man-made reservoirs have the ability to be maintained at a constant level as evaporation, drought, water use and/or flooding affect elevation levels. 

Maps of BRA lakes may be found online by visiting each reservoirs' web page: Possum Kingdom, Granbury and Limestone.  Printed maps of each reservoir are available free of charge at each lake office or by calling the Public Information Office at (888) 922-6272.