Waterlands
St Marys River
USGS · 01661500
ST MARYS RIVER
USGS · 01661500LIVE

ST MARYS RIVER AT GREAT MILLS, MD

SAINT MARY'S COUNTY, MD38.2418°N, -76.5037°W Updated 41 min ago
FLOW RATE
9.56cfs
GAUGE HT
1.53ft
Flow Rate Historical Avg
MEDIAN FLOW RATE · 1 DAY
9.56cfs 29.9% vs avg
Optimal band: 12–16 cfs
PERIOD HIGH
217cfs
PERIOD LOW
1.57cfs
RUNNABLE
10%
last 1 day in band

Gauge Height

1.53ft
Precipitation History
Your History · ST MARYS RIVER AT GREAT MILLS, MD

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Station Location

38.2418, -76.5037
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DATA · USGS · NOAA · NWSUPDATED 2026-07-07 23:15 UTC
Site #01661500·USGS

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