Lake Monticello, also known as Monticello Reservoir, is a 6,700-acre lake located in Fairfield County, South Carolina, about 35 minutes from Columbia. The lake serves as a pumped storage facility for a nuclear power plant, which causes daily water level fluctuations of up to 5 feet. These fluctuations create significant safety hazards for boaters, who must exercise extreme caution.

Due to its unique purpose, Lake Monticello has heavy restrictions on recreational use. Water-skiing and jet skis are prohibited. Paddlers should be aware that the lake's primary function is not recreation, and they must adhere to all posted regulations.

The lake offers 54 miles of shoreline, with 7.2 miles within a restricted Nuclear Exclusion Zone inaccessible to the public. There are three boat ramps available for access, including the 99 Boat Launch Ramp in the northwest corner and the Monticello Boat Launch Ramp on the east side mid-lake. Both ramps have two-lane concrete launches with docks and paved parking.

Lake Monticello is known for its excellent fishing opportunities. The warm water from the power plant creates a longer growing season, resulting in trophy-sized fish. Popular species include largemouth bass, catfish (channel, blue, flathead, and white), crappie, and various sunfish. The South Carolina Department of Natural Resources maintains one fish attractor site on the lake.

The lake's maximum depth is approximately 89 feet. Water temperatures remain warmer than nearby lakes year-round due to the power plant's cooling processes. This unique feature affects the lake's ecosystem and fishing patterns.

Paddlers should note that the lake's water levels can change rapidly, potentially exposing or submerging hazards. The surrounding shoreline is owned by the power company to maintain natural beauty, providing a scenic backdrop for paddling excursions.