USGS Surface Water for USA: Streamflow Measurements

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Streamflow Measurements for the Nation

USGS 10263675 BIG ROCK C WASH A HWY 138 NR LLANO CA

Los Angeles County, California

Hydrologic Unit Code 18090206

Latitude 34°30'21", Longitude 117°50'45" NAD27

Drainage area 53.1 square miles

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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
22	1993-03-17 10:30	PST	Yes	ERH	USGS	61.1				Poor	Clear	NONE
21W	1993-03-11 13:55	PST	Yes	ERH	USGS	52.4				Poor	Clear	NONE
20W	1993-01-21 09:15	PST	Yes	ERH	USGS	82.1				Poor	Clear	NONE
10W	1992-06-17 12:35	PDT	Yes	MJD/JGH	USGS	0.60	4.84			Fair		NONE
9W	1992-06-11 09:20	PDT	Yes	JCB/JLO	USGS	1.37	4.96	0.00	0.30	Fair		NONE
19	1992-06-11 09:00	PDT	Yes	JCB/JLO	USGS	0.28	2.06	0.00	0.20	Fair		NONE
18	1992-05-15 11:20	PDT	Yes	JCB/JLO	USGS	8.46	2.52	0.00	0.20	Fair	DebrisHeavy	NONE
8W	1992-05-15 10:45	PDT	Yes	JCB/JLO	USGS	33.9	5.50	0.20	0.40	Good	DebrisHeavy	NONE
7W	1992-05-12 16:20	PDT	Yes	JCB/JLO	USGS	32.4	5.60			Good	DebrisHeavy	NONE
17	1992-05-12 15:30	PDT	Yes	JCB/JLO	USGS	7.93	2.42			Fair	DebrisHeavy	NONE
16	1992-04-30 14:30	PDT	Yes	JCB	USGS	8.95				Poor	DebrisHeavy	NONE
6W	1992-04-30 08:20	PDT	Yes	JCB	USGS	49.9	5.42	0.00	0.30	Fair	DebrisHeavy	NONE
5W	1992-03-12 12:10	PST	Yes	JA	USGS	5.56				Fair	DebrisHeavy	NONE
15	1992-03-12 11:35	PST	Yes	JA	USGS	10.8				Fair	DebrisHeavy	NONE
4W	1992-02-18 17:00	PST	Yes	JA	USGS	3.10				Fair	Clear	NONE
3W	1992-02-13 10:05	PST	Yes	JA	USGS	40.5	7.89	-0.05	0.20	Poor	Clear	NONE
14	1992-02-13 09:45	PST	Yes	JA	USGS	134	4.41	0.06	0.30	Poor	Clear	NONE
13	1992-02-12 09:30	PST	Yes	JA	USGS	138	4.15	0.00	0.30	Poor	Clear	NONE
2W	1992-02-11 11:20	PST	Yes	JA	USGS	54.8	6.03	-0.03	0.20	Poor	Clear	NONE
12	1992-02-11 09:25	PST	Yes	JA	USGS	298	4.38	-0.13	0.40	Poor	Clear	NONE
11	1991-04-18 13:05	PDT	Yes	JA	USGS	2.08	1.90	-0.01	0.50	Fair	Clear	NONE
10	1991-04-17 10:40	PDT	Yes	JA	USGS	1.87	1.86	0.00	0.40	Fair	Clear	NONE
9	1991-03-05 14:07	PST	Yes	JA	USGS	10.2	2.18	-0.01	0.40	Poor	Clear	NONE
8	1991-03-02 10:05	PST	Yes	JA	USGS	11.9	2.22	0.00	0.50	Fair	Clear	NONE
1W	1991-03-01 10:00	PST	Yes	JA	USGS	106	5.60	-0.06	0.20	Poor	Clear	NONE
7	1991-03-01 09:17	PST	Yes	JA	USGS	128	3.03	0.36	0.20	Poor	Clear	NONE
6	1989-02-27 16:40	PST	Yes	JA	USGS	0.86	3.51	-0.01	0.50	Fair	Clear	NONE
5	1989-02-16 12:40	PST	Yes	JA	USGS	0.38	3.43	0.00	0.30	Fair	Clear	NONE
4	1988-12-27 10:10	PST	Yes	JA	USGS	3.47	3.63	0.06	0.40	Fair	IceCover	NONE
3	1988-12-22 11:05	PST	Yes	JA	USGS	4.32	3.67	0.00	0.40	Fair	Clear	NONE
2	1988-12-16 09:15	PST	Yes	JA	USGS	2.59	3.60	0.01	0.40	Fair	Clear	NONE
1	1988-12-12 12:30	PST	Yes	JA	USGS	0.10	3.30	0.00	0.10	Good	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

1993-03-17 10:30

PST

Yes

ERH

USGS

61.1

Poor

Clear

NONE

21W

1993-03-11 13:55

PST

Yes

ERH

USGS

52.4

Poor

Clear

NONE

20W

1993-01-21 09:15

PST

Yes

ERH

USGS

82.1

Poor

Clear

NONE

10W

1992-06-17 12:35

PDT

Yes

MJD/JGH

USGS

0.60

4.84

Fair

NONE

1992-06-11 09:20

PDT

Yes

JCB/JLO

USGS

1.37

4.96

0.00

0.30

Fair

NONE

1992-06-11 09:00

PDT

Yes

JCB/JLO

USGS

0.28

2.06

0.00

0.20

Fair

NONE

1992-05-15 11:20

PDT

Yes

JCB/JLO

USGS

8.46

2.52

0.00

0.20

Fair

DebrisHeavy

NONE

1992-05-15 10:45

PDT

Yes

JCB/JLO

USGS

33.9

5.50

0.20

0.40

Good

DebrisHeavy

NONE

1992-05-12 16:20

PDT

Yes

JCB/JLO

USGS

32.4

5.60

Good

DebrisHeavy

NONE

1992-05-12 15:30

PDT

Yes

JCB/JLO

USGS

7.93

2.42

Fair

DebrisHeavy

NONE

1992-04-30 14:30

PDT

Yes

JCB

USGS

8.95

Poor

DebrisHeavy

NONE

1992-04-30 08:20

PDT

Yes

JCB

USGS

49.9

5.42

0.00

0.30

Fair

DebrisHeavy

NONE

1992-03-12 12:10

PST

Yes

USGS

5.56

Fair

DebrisHeavy

NONE

1992-03-12 11:35

PST

Yes

USGS

10.8

Fair

DebrisHeavy

NONE

1992-02-18 17:00

PST

Yes

USGS

3.10

Fair

Clear

NONE

1992-02-13 10:05

PST

Yes

USGS

40.5

7.89

-0.05

0.20

Poor

Clear

NONE

1992-02-13 09:45

PST

Yes

USGS

134

4.41

0.06

0.30

Poor

Clear

NONE

1992-02-12 09:30

PST

Yes

USGS

138

4.15

0.00

0.30

Poor

Clear

NONE

1992-02-11 11:20

PST

Yes

USGS

54.8

6.03

-0.03

0.20

Poor

Clear

NONE

1992-02-11 09:25

PST

Yes

USGS

298

4.38

-0.13

0.40

Poor

Clear

NONE

1991-04-18 13:05

PDT

Yes

USGS

2.08

1.90

-0.01

0.50

Fair

Clear

NONE

1991-04-17 10:40

PDT

Yes

USGS

1.87

1.86

0.00

0.40

Fair

Clear

NONE

1991-03-05 14:07

PST

Yes

USGS

10.2

2.18

-0.01

0.40

Poor

Clear

NONE

1991-03-02 10:05

PST

Yes

USGS

11.9

2.22

0.00

0.50

Fair

Clear

NONE

1991-03-01 10:00

PST

Yes

USGS

106

5.60

-0.06

0.20

Poor

Clear

NONE

1991-03-01 09:17

PST

Yes

USGS

128

3.03

0.36

0.20

Poor

Clear

NONE

1989-02-27 16:40

PST

Yes

USGS

0.86

3.51

-0.01

0.50

Fair

Clear

NONE

1989-02-16 12:40

PST

Yes

USGS

0.38

3.43

0.00

0.30

Fair

Clear

NONE

1988-12-27 10:10

PST

Yes

USGS

3.47

3.63

0.06

0.40

Fair

IceCover

NONE

1988-12-22 11:05

PST

Yes

USGS

4.32

3.67

0.00

0.40

Fair

Clear

NONE

1988-12-16 09:15

PST

Yes

USGS

2.59

3.60

0.01

0.40

Fair

Clear

NONE

1988-12-12 12:30

PST

Yes

USGS

0.10

3.30

0.00

0.10

Good

Clear

NONE