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The linked gauge for Grand Lake St. Marys reported 870.78 ft at its latest stored observation on Oct 9, 2026, on a rising 30-day trend (+0.58 ft).
Local gage height: 870.78 ft
+0.58 ft net change over past 30 days
Deepest basin sounding across ~13,500 acres
Water temperature is not available from a verified source for this lake. LakeRadar does not estimate it from latitude, season, or a different lake.
| Observation Date | Gage height (ft) | 24h Change | Approval Status |
|---|---|---|---|
| Fri, Oct 9, 2026 | 871.29 | +0.01 ft | Provisional |
| Thu, Oct 8, 2026 | 871.28 | +0.51 ft | Provisional |
| Thu, Oct 8, 2026 | 870.77 | -0.53 ft | Provisional |
| Wed, Oct 7, 2026 | 871.30 | +0.51 ft | Provisional |
| Wed, Oct 7, 2026 | 870.79 | -0.57 ft | Provisional |
| Tue, Oct 6, 2026 | 871.36 | +0.52 ft | Provisional |
| Tue, Oct 6, 2026 | 870.84 | -0.53 ft | Provisional |
| Mon, Oct 5, 2026 | 871.37 | +0.51 ft | Provisional |
Estimated from recent weather conditions. Deeper water may be considerably cooler, especially in stratified lakes.
Direct in-situ sensor data is required to compute numeric suitability.
Water temperature is not available from a verified source for this lake. No swimming score is shown without it.
| Mon, Oct 5, 2026 | 870.86 | -0.54 ft | Provisional |
| Sun, Oct 4, 2026 | 871.40 | +0.51 ft | Provisional |
| Sun, Oct 4, 2026 | 870.89 | -0.56 ft | Provisional |
| Sat, Oct 3, 2026 | 871.45 | +0.51 ft | Provisional |
| Sat, Oct 3, 2026 | 870.94 | -0.51 ft | Provisional |
| Fri, Oct 2, 2026 | 871.45 | — | Provisional |