Updated
Great Falls
Waterfall · Potomac, Maryland
Cold water — serious cold-shock risk today
Cold waterCold water — serious cold-shock risk today: water temperature is 53°F, cold enough to cause cold-water shock on sudden immersion.
- Water temp 53°F (12°C)
- Streamflow 31 ft³/s
- Gage height 2.99 ft
Live, provisional data from USGS gauge DIFFICULT RUN NEAR GREAT FALLS, VA (1.6 mi away), as of Oct 20, 2:15 AM gauge-local time.
- Flow is above the 75th percentile for Oct 20 (median 20 ft³/s over 91 years); fast water is the top river-drowning risk. — USGS daily streamflow statistics, as of Oct 20, 2:15 AM gauge-local time
Why, sources & official advisories
- Water temperature is 53°F, cold enough to cause cold-water shock on sudden immersion. — USGS gauge 01646000, as of Oct 20, 2:15 AM gauge-local time
No official beach-advisory feed for Maryland yet — follow posted signs and local guidance.
Get an email when it’s warm enough
It’s 53°F at Great Falls now. We check the water daily and email you once when it reaches your temperature.
Stretch of powerful rapids & waterfalls on the Potomac River, with hiking trails nearby.
Things to Do Near Great Falls
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Weather at Great Falls
47°F, Clear · H 68° / L 46° · 3% chance of rain3-day forecast
Frequently asked questions
- Where is Great Falls?
- Great Falls is a waterfall in Potomac, Maryland.
- What is the water temperature at Great Falls?
- As of October 20, 2026, the water temperature at Great Falls in Potomac, Maryland is 53°F (12°C), measured by USGS gauge 01646000, 1.6 miles away.
- Can you swim at Great Falls?
- Cold water — serious cold-shock risk today: water temperature is 53°F, cold enough to cause cold-water shock on sudden immersion. Checked October 20, 2026.
- How is Great Falls rated?
- Great Falls in Potomac, Maryland has an average visitor rating of 4.7 out of 5, based on 573 reviews.
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Location & Contact
Potomac, MD 20854
Potomac, Maryland 20854
💧 Best times & visiting tips
- ›Visit after rainfall for best water flow
- ›Wear sturdy hiking boots with good traction
- ›Bring a waterproof camera or phone case
- ›Stay on designated trails and viewing areas
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