Big Bend Reservoir water level today
Reservoir in Lyman, South Dakota · Missouri River
1,420.57ft
432.99 m · NGVD29
Measured · provisional
Normal for the dateFalling
What this means
Big Bend Reservoir is 0.57 ft above its full pool of 1,420.00 ft.
It is lower than on Oct 21 in 7 of the last 10 years.
The lake has fallen 0.11 ft in 7 days and fallen 0.36 ft in 30 days.
Since 1989, the lowest daily level was 1,415.02 ft (Oct 1996) and the highest 1,421.92 ft (Jun 1991).
Big Bend Reservoir level chart
Loading chart…
Measured
Normal range for the date (middle 50% of past years)
Full pool
Same date in past years
| Date | Level | vs today |
|---|---|---|
| Oct 21, 2025 | 1,420.86 ft | ▲ 0.29 ft |
| Oct 21, 2024 | 1,420.94 ft | ▲ 0.37 ft |
| Oct 21, 2023 | 1,420.79 ft | ▲ 0.22 ft |
| Oct 21, 2022 | 1,420.36 ft | ▼ 0.21 ft |
| Oct 21, 2021 | 1,420.62 ft | ▲ 0.05 ft |
| Oct 21, 2020 | 1,420.53 ft | ▼ 0.04 ft |
| Oct 21, 2019 | 1,420.91 ft | ▲ 0.34 ft |
| Oct 21, 2018 | 1,420.73 ft | ▲ 0.16 ft |
| Oct 21, 2017 | 1,420.65 ft | ▲ 0.08 ft |
| Oct 21, 2016 | 1,420.27 ft | ▼ 0.30 ft |
Records & details
- Highest
- 1,421.92 ft on Jun 5, 1991
- Lowest
- 1,415.02 ft on Oct 22, 1996
- Records from
- 1989 (37 years of daily data)
- Full pool
- 1,420.00 ft (top of conservation pool, U.S. Army Corps of Engineers)
- Inflow
- 11,000 cfs (311.5 m³/s)
- Outflow
- 13,419 cfs (380.0 m³/s)
- Water temperature
- 59 °F (14.9 °C)
Weather & wind
This Afternoon71°F · Mostly Sunny
Wind NNE 9 mph
Wind NNE 9 mph
Tonight47°F · Mostly Clear
Wind E 3 to 7 mph
Wind E 3 to 7 mph
Thursday77°F · Mostly Sunny
Wind SE 5 to 17 mph
Wind SE 5 to 17 mph
Thursday Night58°F · Partly Cloudy then Slight Chance Light Rain
Wind SE 13 to 16 mph
Wind SE 13 to 16 mph
Friday79°F · Mostly Sunny
Wind SSE 14 to 24 mph
Wind SSE 14 to 24 mph
Friday Night54°F · Partly Cloudy then Slight Chance Light Rain
Wind SSW 12 to 22 mph
Wind SSW 12 to 22 mph
NOAA National Weather Service forecast for this lake's location, updated 34 min ago.