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USGS Daily Statistics for Texas

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The statistics generated from this site are based on approved daily-mean data and may not match those published by the USGS in official publications. The user is responsible for assessment and use of statistics from this site. For more details on why the statistics may not match, click here.

USGS 08170500 San Marcos Rv at San Marcos, TX


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
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00060, Discharge, cubic feet per second,
Day of
month		 Mean of daily mean values for each day for water year of record in, ft3/s   (Calculation Period 1994-10-01 -> 2025-09-30)

Calculation period restricted by USGS staff due to special conditions at/near site
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
1 175 177 177 179 174 185 190 178 171 161 226 181
2 176 177 178 180 174 185 202 178 169 162 202 181
3 176 180 177 180 174 185 198 177 169 161 197 182
4 176 179 178 180 175 185 194 176 168 161 195 182
5 176 178 178 180 176 187 188 176 168 161 189 181
6 175 178 177 180 175 185 187 175 167 162 183 181
7 175 179 178 180 175 189 186 175 168 161 182 182
8 175 178 178 178 175 186 186 174 167 162 181 182
9 175 178 178 178 174 196 187 174 170 161 181 182
10 175 178 178 177 175 198 186 173 167 160 180 181
11 174 178 177 184 175 192 185 173 169 160 180 181
12 174 178 181 177 177 190 184 172 167 160 179 181
13 177 181 179 177 176 189 184 171 167 161 179 181
14 178 181 179 176 176 188 183 172 168 174 179 181
15 176 181 179 175 177 188 183 171 166 167 188 181
16 176 181 179 175 177 187 183 171 169 164 207 180
17 176 181 179 175 177 188 182 170 168 355 226 179
18 176 180 179 177 177 187 182 169 167 307 199 180
19 176 180 179 176 178 186 181 169 166 208 189 180
20 175 181 180 176 178 187 187 168 168 188 185 179
21 175 180 179 175 178 190 202 168 165 181 190 179
22 178 180 178 174 178 195 193 169 165 178 198 178
23 176 180 178 176 178 189 191 169 164 179 197 178
24 177 179 178 175 181 187 191 169 164 180 192 177
25 181 179 178 176 182 187 189 167 163 173 185 177
26 178 178 178 176 181 186 183 169 180 172 184 177
27 179 178 178 175 184 186 182 170 169 171 183 177
28 178 177 184 175 184 185 181 169 165 170 184 177
29 178 157 181 175 183 185 180 168 164 170 183 177
30 177   180 174 188 188 179 170 162 338 182 176
31 177   179   185   179 170   305   176