Lake Dunlap is a reservoir on the Guadalupe River near the town of New Braunfels in Guadalupe County, Texas, USA. 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. Lake Dunlap also serves as a venue for outdoor recreation, including fishing and boating.