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

ST MARYS RIVER AT GREAT MILLS, MD

MARYLAND38.2418°N, -76.5037°W Updated 1 hr ago
FLOW RATE
11.5cfs
GAUGE HT
1.57ft
Flow Rate Historical Avg
MEDIAN FLOW RATE · 1 DAY
11.5cfs 26.2% vs avg
Optimal band: 14–19 cfs
PERIOD HIGH
217cfs
PERIOD LOW
1.57cfs
RUNNABLE
9%
last 1 day in band

Gauge Height

1.57ft
Precipitation History
Your History · ST MARYS RIVER AT GREAT MILLS, MD

Track your history

Sign in to track your sessions at ST MARYS RIVER AT GREAT MILLS, MD — best days, monthly trends, and time on the water.

Sign in
SPONSORED

Station Location

38.2418, -76.5037
Loading map…
DATA · USGS · NOAA · NWSUPDATED 2026-07-07 20:15 UTC
Site #01661500·USGS

Create a free account to save favorites, set flow alerts, and track conditions

Sign up free