Waterlands
Difficult Run
USGS · 01646000
DIFFICULT RUN
USGS · 01646000LIVE

DIFFICULT RUN NEAR GREAT FALLS, VA

RESTON, VA38.9759°N, -77.2458°W Updated 12 hr ago
FLOW RATE
35cfs
GAUGE HT
3.06ft
WATER TEMP
78°F
Flow Rate Historical Avg
MEDIAN FLOW RATE · 1 YEAR
35cfs 42.4% vs avg
Optimal band: 12–16 cfs
PERIOD HIGH
1,006cfs
PERIOD LOW
4cfs
RUNNABLE
15%
last 1 year in band

Gauge Height

3.06ft

Water Temperature

77.7°F

Water Turbidity

Precipitation History
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Station Location

38.9759, -77.2458
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DATA · USGS · NOAA · NWSUPDATED 2026-07-12 00:00 UTC
Site #01646000·USGS

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