USGS Surface Water for USA: Streamflow Measurements

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Streamflow Measurements for the Nation

Streamflow measurement pages will be decommissioned in early 2026. Please find the modernized pages in WDFN that suit you best. Learn more about our modernization plans and timeline and new pages.

USGS 08173500 San Marcos Rv at Ottine, TX

Gonzales County, Texas

Hydrologic Unit Code 12100203

Latitude 29°35'33.39", Longitude 97°35'17.12" NAD83

Drainage area 1,249 square miles

Contributing drainage area 1,249 square miles

Gage datum 285.20 feet above NGVD29

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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
19	2011-09-12 14:20	CDT	Yes	MAW/BLP	USGS	71.1	1.14	0.00	2.00	Fair	Unspecifed	NONE
18	2011-09-12 13:51	CDT	Yes	MAW/BLP	USGS	73.5	1.14	0.00	2.00	Fair	Unspecifed	NONE
17	2011-08-22 12:15	CDT	Yes	MAW/BLP	USGS	77.1	1.17	-0.01	1.00	Fair	Unspecifed	NONE
16	2011-08-22 11:52	CDT	Yes	MAW/BLP	USGS	78.9	1.18	-0.01	1.00	Fair	Unspecifed	NONE
15	2011-08-09 17:40	CDT	Yes	MAW/BLP	USGS	78.8	1.19	-0.03	1.30	Fair	Clear	NONE
14	2011-08-09 17:18	CDT	Yes	MAW/BLP	USGS	80.8	1.18	-0.03	1.30	Fair	Clear	NONE
13	2011-04-14 15:59	CDT	Yes	MAW/ABM	USGS	150	1.51	0.00	0.50	Fair		NONE
12	2011-04-14 12:31	CDT	Yes	MAW/ABM	USGS	148	1.52	0.00	0.30	Fair		NONE
11	2011-04-14 12:16	CDT	Yes	MAW/ABM	USGS	149	1.52	0.00	0.30	Fair		NONE
10	2011-03-23 16:16	CDT	Yes	MAW/ABM	USGS	173	1.62	0.00	0.40	Fair		NONE
9	2011-03-23 15:53	CDT	Yes	MAW/ABM	USGS	176	1.62	0.00	0.40	Fair		NONE
7	2011-01-26 13:47	CST	Yes	MAW/ABM	USGS	229	1.85	-0.01	0.60	Fair		NONE
6	2011-01-26 13:19	CST	Yes	MAW/ABM	USGS	220	1.85	0.00	0.50	Fair		NONE
5	2010-04-05 13:58	CDT	Yes	MAW/ABM	USGS	522	2.89			Unspecified		NONE
4	2010-04-05 13:35	CDT	Yes	MAW/ABM	USGS	529	2.89	0.00	2.00	Poor		NONE
3	2010-03-17 11:07	CDT	Yes	MAW/ABm	USGS	609	3.25	-0.01	0.30	Fair		NONE
2	2010-03-16 12:24	CDT	Yes	MAW/ABM	USGS	640	3.19	0.00	0.30	Fair		NONE
1	2010-01-27 11:14	CST	Yes	MAW/ABM	USGS	663	3.17	0.00	1.60	Fair		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

2011-09-12 14:20

CDT

Yes

MAW/BLP

USGS

71.1

1.14

0.00

2.00

Fair

Unspecifed

NONE

2011-09-12 13:51

CDT

Yes

MAW/BLP

USGS

73.5

1.14

0.00

2.00

Fair

Unspecifed

NONE

2011-08-22 12:15

CDT

Yes

MAW/BLP

USGS

77.1

1.17

-0.01

1.00

Fair

Unspecifed

NONE

2011-08-22 11:52

CDT

Yes

MAW/BLP

USGS

78.9

1.18

-0.01

1.00

Fair

Unspecifed

NONE

2011-08-09 17:40

CDT

Yes

MAW/BLP

USGS

78.8

1.19

-0.03

1.30

Fair

Clear

NONE

2011-08-09 17:18

CDT

Yes

MAW/BLP

USGS

80.8

1.18

-0.03

1.30

Fair

Clear

NONE

2011-04-14 15:59

CDT

Yes

MAW/ABM

USGS

150

1.51

0.00

0.50

Fair

NONE

2011-04-14 12:31

CDT

Yes

MAW/ABM

USGS

148

1.52

0.00

0.30

Fair

NONE

2011-04-14 12:16

CDT

Yes

MAW/ABM

USGS

149

1.52

0.00

0.30

Fair

NONE

2011-03-23 16:16

CDT

Yes

MAW/ABM

USGS

173

1.62

0.00

0.40

Fair

NONE

2011-03-23 15:53

CDT

Yes

MAW/ABM

USGS

176

1.62

0.00

0.40

Fair

NONE

2011-01-26 13:47

CST

Yes

MAW/ABM

USGS

229

1.85

-0.01

0.60

Fair

NONE

2011-01-26 13:19

CST

Yes

MAW/ABM

USGS

220

1.85

0.00

0.50

Fair

NONE

2010-04-05 13:58

CDT

Yes

MAW/ABM

USGS

522

2.89

Unspecified

NONE

2010-04-05 13:35

CDT

Yes

MAW/ABM

USGS

529

2.89

0.00

2.00

Poor

NONE

2010-03-17 11:07

CDT

Yes

MAW/ABm

USGS

609

3.25

-0.01

0.30

Fair

NONE

2010-03-16 12:24

CDT

Yes

MAW/ABM

USGS

640

3.19

0.00

0.30

Fair

NONE

2010-01-27 11:14

CST

Yes

MAW/ABM

USGS

663

3.17

0.00

1.60

Fair

NONE

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U.S. Department of the Interior | U.S. Geological Survey
Title: Surface Water for USA: Streamflow Measurements
URL: https://waterdata.usgs.gov/nwis/measurements?

Page Contact Information: Texas Water Data Support Team
Page Last Modified: 2025-12-10 05:25:22 EST
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