Lake Bastrop is a reservoir on Spicer Creek in the Colorado River basin 3 miles (5 km) northeast of the town of Bastrop in central Bastrop County, Texas, USA. The reservoir was formed in 1964 by the construction of a dam by the Lower Colorado River Authority. The lake serves primarily as a power plant cooling pond for the Sim Gideon Power Plant operated by the LCRA and the Lost Pines Power Project 1, owned by GenTex Power Corporation, a wholly owned affiliate of the LCRA.