USGS stream gauge 01646500 · Maryland

Potomac River near Washington, DC Little Falls Pump Station, MD

As of Oct 28, 2026, 4:50 AM EDT, this gauge read a gage height of 3.00 ft and a flow of 2,850 cfs. Over the past 7 days the water level fell 0.35 ft. Data from the USGS.

Updated Oct 28, 2026, 5:26 AM EDT (USGS Water Data snapshot)

Gage height

3.00 ft

7-day range 2.99–3.35 ft

Discharge

2,850cfs

7-day range 2,800–4,950 cfs

Latest reading

37 min ago

Oct 28, 2026, 4:50 AM EDT

Readings are provisional USGS data and may be revised. Rivers can rise fast after rain upstream. For flood warnings, check weather.gov and follow local authorities.

Gage height, past 7 days

2.963.073.173.273.38Oct 21Oct 22Oct 23Oct 24Oct 25Oct 26Oct 27
Gage height (ft), hourly, past 7 days. Low 2.99 · High 3.35.

Discharge, past 7 days

2,6283,2523,8754,4995,122Oct 21Oct 22Oct 23Oct 24Oct 25Oct 26Oct 27
Discharge (cfs), hourly, past 7 days. Low 2,800 · High 4,950.

Chart dates are in Maryland local time (America/New York).

Reading this gauge

Gage height is the water surface level above this station's own reference point, so 3.00 ft is not the river depth and cannot be compared with other gauges. Discharge, the volume of water flowing past each second, is the better number for comparing conditions over time and between rivers.

Station details
USGS site number01646500
Official namePOTOMAC RIVER NEAR WASH, DC LITTLE FALLS PUMP STA
StateMaryland
Drainage area11,560 sq mi
Gage datum elevation37.0 ft above sea level
Coordinates38.9498° N, 77.1276° W

Source: USGS Water Data for the Nation, site 01646500. Parameters 00065 (gage height) and 00060 (discharge).

USGS station page View on OpenStreetMap Maryland earthquakes

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