Meadow Lake is a reservoir on the Guadalupe River south of the town of Seguin in Guadalupe County, Texas. The reservoir was formed in 1931 by the construction of a dam to provide hydroelectric power to the area. Management of the dam and lake was assumed by the Guadalupe-Blanco River Authority on May 1, 1963. Meadow Lake also serves as a venu…Meadow Lake is a reservoir on the Guadalupe River south of the town of Seguin in Guadalupe County, Texas. The reservoir was formed in 1931 by the construction of a dam to provide hydroelectric power to the area. Management of the dam and lake was assumed by the Guadalupe-Blanco River Authority on May 1, 1963. Meadow Lake also serves as a venue for outdoor recreation, including fishing and boating.