Angostura Reservoir, SD

As of 2026-10-12, Angostura Reservoir sits at 3169.36 ft, which is low for this time of year. Over the past 30 days the level has risen 2.97 ft.

The most recent reading at Angostura Reservoir is 3169.36 ft (2026-10-12), sourced from the U.S. Bureau of Reclamation. Readings on this page refresh automatically as the agency publishes new data.

The highest level for Angostura Reservoir in our records is 3186.68 ft on 2024-05-15. The lowest is 3166.12 ft on 2026-09-04. Our record covers about 5 years of readings.

Compared with every October in our records, the current level is higher than 7% of them, which we classify as low 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. Angostura Reservoir has risen 2.97 ft over the past 30 days. For the operational reason on any given week, check the U.S. Bureau of Reclamation directly.

Angostura Reservoir is -1.23 ft compared with this date last year (3169.36 ft today). The full-history chart above covers 5 years, with a record high of 3186.68 ft and a record low of 3166.12 ft.