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USGS Daily Statistics for the Nation

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
1 178 180 177 179 174 185 190 178 171 161 230 184
2 179 180 178 180 174 185 202 178 169 162 205 185
3 179 183 177 180 174 185 198 177 169 161 200 185
4 179 182 178 180 175 185 194 176 168 161 198 185
5 179 181 178 180 176 187 188 176 168 161 192 185
6 178 181 177 180 175 185 187 175 167 162 186 185
7 178 182 178 180 175 189 186 175 168 161 185 185
8 178 181 178 178 175 186 186 174 167 162 184 185
9 178 181 178 178 174 196 187 174 170 161 184 185
10 178 181 178 177 175 198 186 173 167 160 183 184
11 177 181 177 184 175 192 185 173 169 160 183 184
12 177 181 181 177 177 190 184 172 167 160 183 184
13 180 181 179 177 176 189 184 171 167 161 182 184
14 181 181 179 176 176 188 183 172 168 174 183 184
15 179 181 179 175 177 188 183 171 166 167 192 184
16 179 181 179 175 177 187 183 171 169 164 212 183
17 179 181 179 175 177 188 182 170 168 355 231 183
18 179 180 179 177 177 187 182 169 167 307 203 184
19 179 180 179 176 178 186 181 169 166 208 193 183
20 178 181 180 176 178 187 187 168 168 188 188 182
21 178 180 179 175 178 190 202 168 165 181 193 182
22 181 180 178 174 178 195 193 169 165 178 202 181
23 179 180 178 176 178 189 191 169 164 179 200 181
24 180 179 178 175 181 187 191 169 164 183 195 180
25 184 179 178 176 182 187 189 167 163 175 189 180
26 181 178 178 176 181 186 183 169 180 175 188 180
27 182 178 178 175 184 186 182 170 169 173 186 180
28 181 177 184 175 184 185 181 169 165 173 187 180
29 181 157 181 175 183 185 180 168 164 173 186 180
30 180   180 174 188 188 179 170 162 346 185 179
31 180   179   185   179 170   312   179