USGS Surface Water for USA: Peak Streamflow

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Peak Streamflow for the Nation

Hays County, Texas

Hydrologic Unit Code 12100203

Latitude 29°53'20", Longitude 97°56'02" NAD27

Drainage area 48.9 square miles

Contributing drainage area 48.9 square miles

Gage datum 557.67 feet above NAVD88

Water Year	Date	Gage Height (feet)	Stream- flow (cfs)
1995	1995-09-20	7.72	785^C
1996	1996-08-24	6.84	550^C
1997	1997-06-21	7.73	787^C
1998	1998-09-16	6.59	449^C
1999	1998-10-17	21.29	21,500^C
2000	2000-05-19	6.38	382^C
2001	2001-04-23	7.17	620^C
2002	2001-11-15	9.33	1,620^C
2003	2003-09-11	7.58	770^C
2004	2004-06-09	6.86	540^C
2005	2004-11-17	10.60	2,370^C
2006	2006-03-20	5.90	317^C
2007	2007-07-21	8.42	1,140^C
2008	2007-10-22	6.64	430^C
2009	2009-04-17	5.61	227^C
2010	2010-04-17	6.80	490^C
2011	2010-12-24	5.24²	223^C
2012	2012-05-10	7.68	809^C
2013	2013-09-29	5.53	270^C
2014	2013-10-31	11.00	2,600^C
2015	2015-05-24	14.40	5,100^C
2016	2016-09-26	10.63²	2,390^8,C
2017	2017-04-11	9.60	1,790^C
2018	2018-03-28	7.59	773^C
2019	2019-04-06	6.42	435^C
2020	2019-10-24	6.37	460^C
2021	2021-09-29	7.03	594
2022	2021-10-14	8.29	1,070^C
2023	2023-04-21	5.27	228^C

Peak Streamflow Qualification Codes.

8 -- Discharge actually greater than indicated value
C -- All or part of the record affected by Urbanization, Mining, Agricultural changes, Channelization, or other

USGS 08170500 San Marcos Rv at San Marcos, TX