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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 08171400 San Marcos Rv nr Martindale, TX


Caldwell County, Texas
Hydrologic Unit Code 12100203
Latitude  29°49'56.23", Longitude  97°50'32.58" NAD83
Drainage area 547  square miles
Gage datum 480.26 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 2010-10-01 -> 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
1 223 230 210 212 240 482 252 198 195 185 1,100 224
2 252 226 212 223 227 478 243 198 192 180 386 221
3 323 255 210 224 218 497 240 198 196 180 326 240
4 278 234 209 206 484 413 240 198 204 176 299 230
5 260 233 213 203 293 387 236 197 201 175 292 236
6 250 224 208 206 244 372 232 194 195 170 275 229
7 244 220 206 222 230 344 227 201 196 167 266 255
8 242 217 206 203 267 326 223 193 192 165 266 269
9 241 216 221 197 631 313 230 192 224 167 263 237
10 232 216 224 196 336 302 224 197 245 163 260 231
11 230 217 221 192 352 301 224 190 203 164 251 227
12 228 215 224 190 321 295 220 189 195 162 244 224
13 225 212 219 216 355 281 216 185 193 175 237 231
14 222 216 219 193 310 289 217 186 194 699 232 240
15 220 215 214 192 298 289 218 188 199 286 234 233
16 221 210 211 192 308 285 218 204 198 232 231 229
17 231 211 213 192 465 308 214 216 196 215 232 225
18 244 215 207 255 564 290 220 203 202 202 231 221
19 245 214 210 228 439 275 215 196 194 196 228 236
20 233 246 246 242 504 276 233 195 194 194 224 221
21 229 256 240 251 353 267 219 203 168 193 221 216
22 286 231 231 236 327 278 215 202 175 189 225 217
23 243 232 227 232 315 271 218 200 184 193 223 212
24 256 224 222 231 1,170 265 217 196 174 212 220 211
25 414 217 218 225 1,020 259 213 193 173 223 220 209
26 272 214 213 217 1,000 254 211 212 284 230 224 207
27 243 213 212 219 605 258 217 256 251 211 219 244
28 236 212 298 217 543 255 210 241 225 199 219 263
29 235 201 273 222 559 299 207 206 260 191 226 235
30 229   228 218 511 258 201 204 202 922 230 226
31 229   219   518   199 202   1,960   229