National park site
Great Falls Park
Official visitor and safety information for Great Falls.
Visit the official Great Falls Park resource Source: National Park ServiceUSGS 01620000
Potomac River →
Potomac River at Harpers Ferry, WV
Washington County, Maryland · USGS 01620000
Latest observation
What this gauge represents: This gauge measures conditions on Potomac River at its USGS monitoring location in Washington County; conditions elsewhere on the waterway may differ.
STREAMFLOW
—No recent reading available.
GAUGE HEIGHT
—No recent reading available.
WATER TEMPERATURE
—Not measured at this gauge.
How to read these numbers
Streamflow (ft³/s or CFS)
How much water moves past the gauge each second. Higher numbers mean more water is moving downstream.
Gauge height (ft)
The water-surface height at this gauge. It is useful for tracking rises, falls and flood thresholds, but it is not the river's total depth.
24-hour change
How much the latest reading has risen or fallen compared with roughly 24 hours earlier.
Historical median
The typical streamflow for this date based on USGS historical statistics. A multiple such as 3× means current flow is about three times the historical median.
River Pulse
Get Water Data's plain-language summary of current flow, historical context and recent direction.
NOAA flood stage
Official action and flood thresholds where available. These levels are specific to each gauge location.
Gauge height and flood stage are station-specific. A 12-foot reading at one gauge should not be directly compared with 12 feet at another.
EXPLORE
Continue along the Potomac River
Connect this monitoring-location reading with verified places and official visitor information. A gauge describes conditions only at its location; it is not itself a public access point.
Explore the Potomac RiverNational historical park
Chesapeake & Ohio Canal
Towpath, visitor center and river-corridor information.
Visit the official Chesapeake & Ohio Canal resource Source: National Park ServicePaddling guide
Paddle the Potomac River
NPS trip context for a documented paddling reach.
Visit the official Paddle the Potomac River resource Source: National Park ServiceFishery research
Potomac fish research
USGS basin fish data and methods.
Visit the official Potomac fish research resource Source: U.S. Geological SurveySTATION DETAILS
About this gauge
Site type: Stream
County: Washington County
Drainage area: 6,290 mi²
Current measurements: 0
DATA SOURCE
Official USGS station
Get Water Data organizes provisional public monitoring data from the U.S. Geological Survey.
View USGS station →