USGS Surface Water for USA: Streamflow Measurements

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Streamflow Measurements for the Nation

USGS 0165690673 FROG BRANCH ABOVE FLATLICK BRANCH AT CHANTILLY, VA

Fairfax County, Virginia

Hydrologic Unit Code 02070010

Latitude 38°52'52.1", Longitude 77°25'49.7" NAD83

Drainage area 0.99 square miles

Gage datum 242.9 feet above NAVD88

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Meas. Number	Date Time	Time Datum	Measurement Used?	Who	Measuring Agency	Stream flow (ft³/s)	Gage Height (ft)	GH Change (ft)	Meas. Duration (hr)	Meas. Rated	Control	Flow Adjust. Code
43	2025-08-12 08:40:51	EDT	Yes	TJT/HDR	USGS	0.07	17.87	0.00	0.50	Poor	DebrisLight	NONE
42S	2025-06-15 -- --	--	Yes	TJT	USGS	809	21.49			Poor		NONE
42	2025-06-10 09:14:31	EDT	Yes	TJT/HDR	USGS	0.33	17.92	0.00	0.47	Poor	DebrisModerate	NONE
41S	2025-05-13 09:30	EDT	Yes	TJT	USGS	63.0	19.71			Poor		NONE
41	2025-04-01 12:51	EDT	Yes	TJT/HDR	USGS	0.58	18.04	0.00	0.48	Poor	DebrisHeavy	NONE
40S	2024-12-11 11:30	EST	Yes	TJT	USGS	62.0	20.07			Poor		NONE
40	2024-10-16 11:04:38	EDT	Yes	TJT/RAM	USGS	0.02	17.87	0.00	0.40	Poor	DebrisModerate	NONE
37	2022-10-17 11:40:32	EDT	Yes	BWD	USGS	0.13	17.94	0.00	0.25	Poor	DebrisModerate	NONE
39S	2022-07-13 23:30	EDT	Yes	BWD	USGS	46.0	19.54			Unknown		NONE
38S	2022-07-09 01:15	EDT	Yes	BWD	USGS	221	20.71			Unknown		NONE
36	2022-06-30 12:40:52	EDT	Yes	BWD/HKC	USGS	0.15	17.92	0.00	0.42	Poor	DebrisHeavy	NONE
37S	2022-05-07 02:00	EDT	Yes	BWD	USGS	54.0	19.94			Unknown		NONE
35	2022-03-03 12:00:09	EST	Yes	BWD/HKC	USGS	0.37	17.93	0.00	0.50	Poor	DebrisLight	NONE
34	2020-02-07 10:04	EST	Yes	HDR/EDI	USGS	9.26	18.34	-0.02	0.30	Fair	Clear	NONE
33	2020-01-14 08:23:30	EST	Yes	JMD/CND	USGS	0.83	17.95	0.00	0.50	Good	DebrisLight	NONE
36S	2019-10-31 21:30	EDT	Yes	JMD	USGS	167	19.76			Unknown		NONE
32	2019-09-11 11:41	EDT	Yes	JMD/HDR	USGS	0.09	17.86	0.00	1.00	Poor	Clear	NONE
35S	2019-08-20 17:45	EDT	Yes	JMD	USGS	510	21.27			Unknown		NONE
34S	2019-08-15 16:00	EDT	Yes	JMD	USGS	829	21.92			Unknown		NONE
31	2019-06-13 11:41	EDT	Yes	JMD	USGS	1.92	18.05	-0.02	0.50	Good	DebrisLight	NONE
30	2019-03-13 15:34	EDT	Yes	JMD/HDR	USGS	0.93	17.99	0.00	0.40	Poor	Clear	NONE
33S	2018-09-28 01:50	EDT	Yes	JMD	USGS	172	19.83			Unknown		NONE
32S	2018-08-21 13:15	EDT	Yes	JMD	USGS	436	21.02			Unknown		NONE
31S	2018-08-01 02:30	EDT	Yes	JMD	USGS	584	21.40			Unknown		NONE
30S	2018-07-21 19:30	EDT	Yes	JMD	USGS	657	21.62			Unknown		NONE
29	2018-04-25 08:50:30	EDT	Yes	HDR/JMD	USGS	2.71	18.15	0.00	0.40	Fair	DebrisHeavy	NONE
28	2018-04-05 08:56:30	EDT	Yes	JMD/HDR	USGS	0.53	18.08	0.00	0.50	Poor	DebrisHeavy	NONE
027	2018-02-27 11:10	EST	Yes	JMD/TDC	USGS	0.96	18.79	0.00	0.50	Fair	DebrisHeavy	NONE
26	2015-10-13 16:27:30	EDT	Yes	TPN	USGS	0.11	17.94			Poor		NONE
25	2012-01-12 14:56	EST	Yes	CCR/KMD	USGS	3.66	18.11	0.00		Good	VegetationLight	NONE
24	2011-11-02 10:26:30	EDT	Yes	kmd,neb	USGS	0.88	17.96	0.00	0.40	Poor	DebrisLight	NONE
23	2011-09-14 09:48:30	EDT	Yes	DLM/KMD	USGS	0.52	17.93	0.00	0.70	Fair	Clear	NONE
22S	2011-09-08 17:00	EDT	Yes	RRL	USGS	1490	22.56			Poor		NONE
21	2011-08-31 09:15:30	EDT	Yes	KMD/WVD	USGS	0.21	17.88	0.00	0.50	Poor	VegetationLight	NONE
20	2011-07-06 14:41	EDT	Yes	KMD/WVD	USGS	0.42	17.92	-0.02	0.50	Poor	VegetationModerate	NONE
19	2011-04-20 14:35:30	EDT	Yes	RLY/KMD	USGS	1.03	18.11	0.00	0.50	Fair	DebrisModerate	NONE
18	2011-03-10 15:42:30	EST	Yes	RLY/KMD	USGS	17.2	18.58	0.12	0.20	Poor	DebrisModerate	NONE
17	2011-03-10 15:02:30	EST	Yes	RLY/KMD	USGS	7.86	18.31	0.02	0.20	Poor	Clear	NONE
16	2011-03-09 09:10	EST	Yes	RLY/KMD	USGS	2.42	18.35	0.00	0.50	Fair	DebrisHeavy	NONE
15	2011-01-19 15:59	EST	Yes	KMD/RLY	USGS	0.34	17.86	0.00	0.50	Poor	IceCover	NONE
14	2010-11-05 09:03	EDT	Yes	RLY/KMD	USGS	1.95	18.30	0.00	0.40	Fair	DebrisHeavy	NONE
13	2010-09-30 12:55	EDT	Yes	ALH/NEB	USGS	13.6	18.80	-0.03	0.20	Poor		NONE
12	2010-09-08 09:00	EDT	Yes	RLY/KMD	USGS	0.08	17.86			Good		NONE
11	2010-07-14 11:26:30	EDT	Yes	KMD/MJB	USGS	1.36	18.28	0.00	0.60	Fair	DebrisHeavy	NONE
10	2010-05-20 09:25:30	EDT	Yes	RLY/KMD	USGS	0.34	17.91	0.00	0.30	Fair	Clear	NONE
9	2009-12-09 12:25	EST	Yes	KMD	USGS	13.7	18.82	-0.01	0.30	Good	DebrisHeavy	NONE
8	2009-11-10 14:48	EST	Yes	RJA/KMD	USGS	0.89	18.08	0.00	0.20	Poor	DebrisHeavy	NONE
7	2009-09-28 13:54	EDT	Yes	KMD/RJA	USGS	0.48	17.99	0.00	0.20	Poor	Unspecifed	NONE
6	2009-06-10 08:41:30	EDT	Yes	RJA/RBB	USGS	2.43	18.90	-0.01	0.30	Good	DebrisLight	NONE
5	2009-02-05 15:27:30	EST	Yes	RJA/RRL	USGS	1.03	17.97	0.00	0.30	Good	DebrisLight	NONE
4	2008-06-05 11:30	EDT	Yes	RJA/RRL	USGS	6.81	18.49			Good	DebrisHeavy	NONE
3	2008-04-21 10:40	EDT	Yes	RRL	USGS	20.7	18.92	0.00	0.20	Good	DebrisHeavy	NONE
2	2008-04-21 10:17	EDT	Yes	RRL	USGS	20.6	18.90	0.05	0.20	Good	DebrisHeavy	NONE
1	2008-03-28 08:46	EDT	Yes	RJA	USGS	0.76	17.93	0.00	0.20	Fair	Clear	NONE

Meas.
Number

Date Time

Time
Datum

Measurement
Used?

Who

Measuring
Agency

Stream
flow
(ft³/s)

Gage
Height
(ft)

GH
Change
(ft)

Meas.
Duration
(hr)

Meas.
Rated

Control

Flow
Adjust.
Code

2025-08-12 08:40:51

EDT

Yes

TJT/HDR

USGS

0.07

17.87

0.00

0.50

Poor

DebrisLight

NONE

42S

2025-06-15 -- --

Yes

TJT

USGS

809

21.49

Poor

NONE

2025-06-10 09:14:31

EDT

Yes

TJT/HDR

USGS

0.33

17.92

0.00

0.47

Poor

DebrisModerate

NONE

41S

2025-05-13 09:30

EDT

Yes

TJT

USGS

63.0

19.71

Poor

NONE

2025-04-01 12:51

EDT

Yes

TJT/HDR

USGS

0.58

18.04

0.00

0.48

Poor

DebrisHeavy

NONE

40S

2024-12-11 11:30

EST

Yes

TJT

USGS

62.0

20.07

Poor

NONE

2024-10-16 11:04:38

EDT

Yes

TJT/RAM

USGS

0.02

17.87

0.00

0.40

Poor

DebrisModerate

NONE

2022-10-17 11:40:32

EDT

Yes

BWD

USGS

0.13

17.94

0.00

0.25

Poor

DebrisModerate

NONE

39S

2022-07-13 23:30

EDT

Yes

BWD

USGS

46.0

19.54

Unknown

NONE

38S

2022-07-09 01:15

EDT

Yes

BWD

USGS

221

20.71

Unknown

NONE

2022-06-30 12:40:52

EDT

Yes

BWD/HKC

USGS

0.15

17.92

0.00

0.42

Poor

DebrisHeavy

NONE

37S

2022-05-07 02:00

EDT

Yes

BWD

USGS

54.0

19.94

Unknown

NONE

2022-03-03 12:00:09

EST

Yes

BWD/HKC

USGS

0.37

17.93

0.00

0.50

Poor

DebrisLight

NONE

2020-02-07 10:04

EST

Yes

HDR/EDI

USGS

9.26

18.34

-0.02

0.30

Fair

Clear

NONE

2020-01-14 08:23:30

EST

Yes

JMD/CND

USGS

0.83

17.95

0.00

0.50

Good

DebrisLight

NONE

36S

2019-10-31 21:30

EDT

Yes

JMD

USGS

167

19.76

Unknown

NONE

2019-09-11 11:41

EDT

Yes

JMD/HDR

USGS

0.09

17.86

0.00

1.00

Poor

Clear

NONE

35S

2019-08-20 17:45

EDT

Yes

JMD

USGS

510

21.27

Unknown

NONE

34S

2019-08-15 16:00

EDT

Yes

JMD

USGS

829

21.92

Unknown

NONE

2019-06-13 11:41

EDT

Yes

JMD

USGS

1.92

18.05

-0.02

0.50

Good

DebrisLight

NONE

2019-03-13 15:34

EDT

Yes

JMD/HDR

USGS

0.93

17.99

0.00

0.40

Poor

Clear

NONE

33S

2018-09-28 01:50

EDT

Yes

JMD

USGS

172

19.83

Unknown

NONE

32S

2018-08-21 13:15

EDT

Yes

JMD

USGS

436

21.02

Unknown

NONE

31S

2018-08-01 02:30

EDT

Yes

JMD

USGS

584

21.40

Unknown

NONE

30S

2018-07-21 19:30

EDT

Yes

JMD

USGS

657

21.62

Unknown

NONE

2018-04-25 08:50:30

EDT

Yes

HDR/JMD

USGS

2.71

18.15

0.00

0.40

Fair

DebrisHeavy

NONE

2018-04-05 08:56:30

EDT

Yes

JMD/HDR

USGS

0.53

18.08

0.00

0.50

Poor

DebrisHeavy

NONE

027

2018-02-27 11:10

EST

Yes

JMD/TDC

USGS

0.96

18.79

0.00

0.50

Fair

DebrisHeavy

NONE

2015-10-13 16:27:30

EDT

Yes

TPN

USGS

0.11

17.94

Poor

NONE

2012-01-12 14:56

EST

Yes

CCR/KMD

USGS

3.66

18.11

0.00

Good

VegetationLight

NONE

2011-11-02 10:26:30

EDT

Yes

kmd,neb

USGS

0.88

17.96

0.00

0.40

Poor

DebrisLight

NONE

2011-09-14 09:48:30

EDT

Yes

DLM/KMD

USGS

0.52

17.93

0.00

0.70

Fair

Clear

NONE

22S

2011-09-08 17:00

EDT

Yes

RRL

USGS

1490

22.56

Poor

NONE

2011-08-31 09:15:30

EDT

Yes

KMD/WVD

USGS

0.21

17.88

0.00

0.50

Poor

VegetationLight

NONE

2011-07-06 14:41

EDT

Yes

KMD/WVD

USGS

0.42

17.92

-0.02

0.50

Poor

VegetationModerate

NONE

2011-04-20 14:35:30

EDT

Yes

RLY/KMD

USGS

1.03

18.11

0.00

0.50

Fair

DebrisModerate

NONE

2011-03-10 15:42:30

EST

Yes

RLY/KMD

USGS

17.2

18.58

0.12

0.20

Poor

DebrisModerate

NONE

2011-03-10 15:02:30

EST

Yes

RLY/KMD

USGS

7.86

18.31

0.02

0.20

Poor

Clear

NONE

2011-03-09 09:10

EST

Yes

RLY/KMD

USGS

2.42

18.35

0.00

0.50

Fair

DebrisHeavy

NONE

2011-01-19 15:59

EST

Yes

KMD/RLY

USGS

0.34

17.86

0.00

0.50

Poor

IceCover

NONE

2010-11-05 09:03

EDT

Yes

RLY/KMD

USGS

1.95

18.30

0.00

0.40

Fair

DebrisHeavy

NONE

2010-09-30 12:55

EDT

Yes

ALH/NEB

USGS

13.6

18.80

-0.03

0.20

Poor

NONE

2010-09-08 09:00

EDT

Yes

RLY/KMD

USGS

0.08

17.86

Good

NONE

2010-07-14 11:26:30

EDT

Yes

KMD/MJB

USGS

1.36

18.28

0.00

0.60

Fair

DebrisHeavy

NONE

2010-05-20 09:25:30

EDT

Yes

RLY/KMD

USGS

0.34

17.91

0.00

0.30

Fair

Clear

NONE

2009-12-09 12:25

EST

Yes

KMD

USGS

13.7

18.82

-0.01

0.30

Good

DebrisHeavy

NONE

2009-11-10 14:48

EST

Yes

RJA/KMD

USGS

0.89

18.08

0.00

0.20

Poor

DebrisHeavy

NONE

2009-09-28 13:54

EDT

Yes

KMD/RJA

USGS

0.48

17.99

0.00

0.20

Poor

Unspecifed

NONE

2009-06-10 08:41:30

EDT

Yes

RJA/RBB

USGS

2.43

18.90

-0.01

0.30

Good

DebrisLight

NONE

2009-02-05 15:27:30

EST

Yes

RJA/RRL

USGS

1.03

17.97

0.00

0.30

Good

DebrisLight

NONE

2008-06-05 11:30

EDT

Yes

RJA/RRL

USGS

6.81

18.49

Good

DebrisHeavy

NONE

2008-04-21 10:40

EDT

Yes

RRL

USGS

20.7

18.92

0.00

0.20

Good

DebrisHeavy

NONE

2008-04-21 10:17

EDT

Yes

RRL

USGS

20.6

18.90

0.05

0.20

Good

DebrisHeavy

NONE

2008-03-28 08:46

EDT

Yes

RJA

USGS

0.76

17.93

0.00

0.20

Fair

Clear

NONE