Kirby Lake is a 740-acre man-made reservoir located on the south side of Abilene, Texas, just east of Highway 83, in the northeastern portion of Taylor County. Kirby Lake is within the Brazos River Basin, meaning that Cedar Creek, which feeds Kirby Lake, eventually feeds into the Brazos River. Kirby Lake resides in the Red Prairies portion of the Central Gr…Kirby Lake is a 740-acre man-made reservoir located on the south side of Abilene, Texas, just east of Highway 83, in the northeastern portion of Taylor County. Kirby Lake is within the Brazos River Basin, meaning that Cedar Creek, which feeds Kirby Lake, eventually feeds into the Brazos River. Kirby Lake resides in the Red Prairies portion of the Central Great Plains ecoregion. Management is under the City of Abilene.