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Monocacy River near Dickerson, MD Water Level Today

Maryland · USGS gauge 01643580 · live data · Updated Oct 28, 2026

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About this gauge

USGS gauge 01643580 sits on the Monocacy River and reads everything draining 961 square miles of the Monocacy basin. Its datum sits 198 feet above sea level NAVD88. Daily flow has been on record here since 2023, 3 years of it.

Where this gauge sits in the drainage

Three gauged sites sit upstream of here. The closest is Monocacy River at Jug Bridge near Frederick, MD, reading 817 square miles. This gauge adds the 144 square miles that drain in between. Downstream the next reading comes from Potomac River at Edwards Ferry near Poolesville,md at 11,130 square miles, so what passes this gauge is about 9% of the water measured there. Water passing here goes on to Potomac River near Wash, Dc Little Falls Pump Sta.

Normal flows here

The Monocacy River runs a median of 334 cfs at this gauge across 3 years of record. February is the fullest month at a median 1,060 cfs, and September the leanest at 160 cfs. The highest daily mean on record is 18,900 cfs in 2024, and the lowest is 80 cfs in 2023.

Median flow by month
MonthMedian flowShare of annual median
Jan270 cfs81%
Feb1,060 cfs318%
Mar995 cfs298%
Apr698 cfs209%
May1,030 cfs309%
Jun360 cfs108%
Jul300 cfs90%
Aug245 cfs73%
Sep160 cfs48%
Oct160 cfs48%
Nov198 cfs59%
Dec434 cfs130%

Medians from the USGS daily-statistics record, 2023 to 2026. A month at 100% is running at its own long-term median.

Nearby river gauges

Live streamflow and gage height: USGS gauge 01643580. Percentile context computed against the gauge's period of record. Not for navigation.

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