Napp

Geist Reservoir is a reservoir in the northeastern part of metropolitan Indianapolis, Indiana, United States. It was constructed in 1943 by damming Fall Creek to provide water for Indianapolis. Upon completion, Geist Reservoir was the second-largest man-made lake in Indiana, providing approximately 6,900,000,000 US gallons (2.6×1010 L; 5.7×109 imp gal) of water. It is now the 5th largest reservoir behind Monroe Lake (10,750 acres), Patoka Lake (8,800 acres), Brookville Lake (5,260 acres), and Cecil M. Harden Lake/Raccoon Lake (2,060 acres). The reservoir is located primarily in the northeast corner of Indianapolis and the southeast corner of Fishers, but small parts reach into the nearby towns of Lawrence, Fortville, and McCordsville.