Flatlick Branch above Frog Branch at Chantilly water level

Name: Flatlick Branch above Frog Branch at Chantilly water level (U.S. Geological Survey)
Creator: U.S. Geological Survey
License: https://www.usgs.gov/information-policies-and-instructions/copyrights-and-credits

River gauge, Flatlick Branch, Virginia, United States

Directions

Below flood stage

Water level

1.11ft Steady over the last 24 hours

Measured Oct 20, 2026, 12:00 AM EDT (12 min ago)

Flow: 1.9 cfs
Water temperature: 56 °F

History

7 days

Water level Minor flood stage

What this means

Flatlick Branch above Frog Branch at Chantilly is at 1.11 ft, in the normal range.

It is 7.89 ft below the flood stage of 9.00 ft.

It has barely moved over the past 24 hours. In the last month it has stayed between 1.11 ft and 1.25 ft.

Fall is often low-water season on rivers, until steadier rain returns. The water temperature at the gauge is 56 °F.

Judged against the official flood stage for this gauge. How to read levels

Key numbers

Highest on record: 9.21 ftSeptember 8, 2011

Floating and fishing near Flatlick Branch above Frog Branch at Chantilly

Normal flows mean predictable rapids and good access at most put-ins.

Flood stage here is 9.00 ft, 7.89 ft above the current reading. Beyond it, the National Weather Service also defines moderate and major flood stages.

What happens at each level

15.00 ft: A few homes begin to flood along the stream between Route 50 and the mouth of the stream.
10.00 ft: Buildings on the right bank begin to flood.
9.00 ft: Parking lots on the right bank begin to flood.
6.00 ft: The banks begin to overflow into nearby floodplain, but there is no impact to life or property.
1.11 ft: Right now

Impact statements from the U.S. National Weather Service.

Highest crests on record

Rank	Level	Date
1	9.21 ft	September 8, 2011
2	8.06 ft	July 12, 2013
3	7.07 ft	July 8, 2015
4	6.99 ft	May 11, 2008
5	6.99 ft	May 1, 2014
6	6.71 ft	August 15, 2019
7	6.68 ft	September 1, 2021
8	6.62 ft	October 13, 2011
9	6.26 ft	May 26, 2009
10	6.14 ft	July 21, 2018

Weather at the gauge

Rain in the last 3 days: 0.23 in. Rain that falls upstream can take hours or days to show up at a river gauge.

19 Mon 64° 37° – Wind 10 mph

20 Tue 67° 43° – Wind 11 mph

21 Wed 64° 44° – Wind 8 mph

22 Thu 66° 45° – Wind 10 mph

23 Fri 64° 46° – Wind 8 mph

24 Sat 62° 44° – Wind 4 mph

25 Sun 63° 42° – Wind 5 mph

Forecast: Open-Meteo

Sunrise 07:25 AM Sunset 06:26 PM Daylight 11 hr, 1 min First quarter 65%

Map

Nearby gauges

Gauge	Level	Compared with normal	24 hours	Distance
Difficult Run above Fox Lake near FairfaxRiver gauge, Difficult Run	2.2 cfs	Normal	−0.2 cfs	5.4 mi
South F Little Difficult Run above Mouth near ViennaRiver gauge, South F Little Difficult Run	1.2 cfs	Normal	+0.1 cfs	5.4 mi
Snakeden Branch above Lake Audubon at RestonRiver gauge, Snakeden Branch	0.2 cfs	Normal	±0	5.9 mi
The Glade near Howland Drive at RestonRiver gauge, The Glade	0.3 cfs	High	±0	6 mi
Broad Run near LeesburgRiver gauge, Broad Run	2.18 ft	Below flood stage	−0.15 ft	11 mi
Long Branch near AnnandaleRiver gauge, Long Branch	1.0 cfs	Normal	+0.1 cfs	12 mi
Difficult Run near Great FallsRiver gauge, Difficult Run	3.09 ft	Below flood stage	+0.30 ft	12 mi
Accotink Creek near AnnandaleRiver gauge, Accotink Creek	1.61 ft	Below flood stage	−0.02 ft	12 mi

Questions and answers

What is flood stage for Flatlick Branch above Frog Branch at Chantilly?

The official flood stage is 9.00 ft. The level is currently 7.89 ft below it.

Is gage height the same as water depth?

No. Gage height is measured from a fixed reference point chosen by the agency, so a reading of 10 ft does not mean the river is 10 ft deep.

What is the water level of Flatlick Branch above Frog Branch at Chantilly today?

On Oct 20, 2026, 12:00 AM EDT, the water level was 1.11 ft. Steady over the last 24 hours.

Is Flatlick Branch above Frog Branch at Chantilly rising or falling?

Steady over the last 24 hours.

Is the level of Flatlick Branch above Frog Branch at Chantilly normal?

Below flood stage. Judged against the official flood stage for this gauge.

What is the highest water level ever recorded at Flatlick Branch above Frog Branch at Chantilly?

The highest level on record is 9.21 ft on September 8, 2011.

How often is this data updated?

The U.S. Geological Survey publishes a new reading every 15 minutes. This page refreshes within minutes of each update.

For specialists

Station codes, datum, parameters, data quality and downloads

Operator: U.S. Geological Survey
Station code: usgs:01656903 (Agency page)
Coordinates: 38.88239, -77.43190 (WGS84)
Vertical datum: NAVD88
Update interval: every 15 minutes
Licence: Public domain. Data: U.S. Geological Survey (USGS), provisional data subject to revision

Published series

Parameter	Last value	Time (UTC)	Quality
Water level	1.11 ft	2026-10-20 04:00	Provisional
Flow	1.9 cfs	2026-10-20 04:00	Provisional
Water temperature	56 °F	2026-10-20 04:00	Provisional

Download

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How to cite

U.S. Geological Survey: Flatlick Branch above Frog Branch at Chantilly (usgs:01656903). Accessed October 20, 2026 via Nivelmap, https://nivelmap.com/en/united-states/virginia/flatlick-branch-above-frog-branch-at-chantilly

How we check values

Each reading is stored as published. We hold back values that jump faster than physically plausible and show the measurement time with every value.

Readings are provisional, can be delayed or wrong and are not a flood warning. Read the disclaimer