Pactola Lake is the largest and deepest reservoir in the Black Hills, located 15 miles west of Rapid City, South Dakota, United States.

Constructed in 1952, the dam and waters are managed by the Bureau of Reclamation, with the surrounding land managed by the US Forest Service as part of Black Hills National Forest, which operates a visitor center located on the south side of the dam.

[2] Facilities include campgrounds, hiking trails, picnic areas, cliffs, and a beach.

[4] The new reservoir inundated the mining town of Pactola,[5] and construction was completed in 1956 after the movement of more than 4.3 million cubic yards of embankment fill.

[1] The lake is popular with fishermen, and scuba divers can see the limited remains of the town of Pactola.