Grand Lake Saint Marys State Park siteid=776 · OH

Water level & flow 2023-08-05 .. 2026-09-14 · SWOT depth track + USGS NWIS gauges · one linked timeline

current depth 13 ft

drawdown -12.6 ft below full pool

water level (depth) 100% 13 of 13 ft deep

water stored (volume) 100% est. from bathymetry

measured Sep 14 nwis_stage

pipeline refresh 2026-09-15 23:08 UTC

filter: normal range & outlook fill (Mar–Jun) · drain (Jul–Oct) zoom or pan either chart — the other follows elevation trend: robust smoothing + outlier removal · raw value on hover

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Inflow / outflow USGS NWIS daily discharge · same timeline as above

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