# Grand Lake St Marys water level today

Grand Lake St Marys was at 870.76 ft on October 10, 2026. Over the past week the lake has been falling about 0.03 ft a day.

- Latest reading: 870.76 ft at 2026-10-10T15:15:00.000Z
- 7-day change: −0.18 ft
- 30-day change: +0.05 ft
- State: Ohio
- Source: U.S. Geological Survey — https://waterdata.usgs.gov/monitoring-location/USGS-403204084342601/

## Last 14 days

| Date | Level (ft) |
|---|---|
| 2026-10-10 | 870.76 |
| 2026-10-09 | 870.77 |
| 2026-10-08 | 870.77 |
| 2026-10-07 | 870.79 |
| 2026-10-06 | 870.84 |
| 2026-10-05 | 870.86 |
| 2026-10-04 | 870.89 |
| 2026-10-03 | 870.94 |
| 2026-10-02 | 870.95 |
| 2026-10-01 | 870.94 |
| 2026-09-30 | 870.98 |
| 2026-09-29 | 871.01 |
| 2026-09-28 | 871.04 |
| 2026-09-27 | 871.08 |

Page: https://lakelevel.app/grand-lake-st-marys/ — please cite with a link.