Lake Dunlap (Guadalupe River Basin) | Texas Water Development Board

Lake Dunlap (Guadalupe River Basin)

An aerial view to the TP-1 Dam and Lake Dunlap (Photo provided by the owner)Lake Dunlap (also known as TP-1 Dam) is located nine miles northwest of Seguin in Guadalupe County, on the Guadalupe River.  The Lake is currently owned by Guadalupe-Blanco River Authority for hydro-electric power generation, water conservation and recreational purposes.  Authorization (Permit No. 21) for this project was issued by the State Board of Water Engineers on July 25, 1914.  Construction of the dam started in 1927 and was completed in 1928 by Texas Power Corporation.  Deliberate impoundment of water and power generation began at the time of completion.  The dam is an earthfill embankment with concrete core wall of 2,000 feet long including concrete spillway.  The lake has a capacity of 5,900 acre-feet encompassing a surface area of 410 acres at the conservation pool elevation of 575.2 feet above mean sea level.  The drainage area above the dam is 1,653 square miles.  The water level has been partly regulated by release from the Canyon Reservoir since June 1964.

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