Ninety-Nine Islands Reservoir, SC

As of 2026-10-13, Ninety-Nine Islands Reservoir sits at 512.10 ft, which is high for this time of year. That is 1.00 ft above full pool of 511.10 ft. Over the past 30 days the level has risen 1.60 ft.

The most recent reading at Ninety-Nine Islands Reservoir is 512.10 ft (2026-10-13), sourced from Duke Energy. Readings on this page refresh automatically as the agency publishes new data.

The highest level for Ninety-Nine Islands Reservoir in our records is 517.70 ft on 2024-09-28. The lowest is 507.40 ft on 2022-10-18. Our record covers about 4 years of readings.

Compared with every October in our records, the current level is higher than 97% of them, which we classify as high for this time of year. Seasonal comparison matters more than the raw number, because most reservoirs draw down predictably through late summer and refill over winter and spring.

Reservoir levels move for four main reasons: rainfall and runoff into the basin, releases through the dam for downstream water supply, power generation or flood control, evaporation during hot months, and seasonal drawdown schedules set by the operating agency. Ninety-Nine Islands Reservoir has risen 1.60 ft over the past 30 days. For the operational reason on any given week, check Duke Energy directly.

Ninety-Nine Islands Reservoir is +1.20 ft compared with this date last year (512.10 ft today). The full-history chart above covers 4 years, with a record high of 517.70 ft and a record low of 507.40 ft.