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USGS Daily Statistics for the Nation

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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
1 215 220 203 203 228 455 243 192 195 185 1,100 224
2 241 217 205 213 216 451 235 193 192 180 386 221
3 307 244 202 213 209 469 232 193 196 180 326 240
4 266 225 201 196 453 390 232 193 204 176 299 230
5 249 224 204 194 277 367 230 191 201 175 292 236
6 240 216 200 196 232 353 226 188 195 170 275 229
7 234 212 199 210 219 326 219 195 196 167 266 246
8 232 209 199 194 253 310 216 188 192 165 266 258
9 232 208 212 188 589 297 222 187 224 167 263 228
10 225 208 215 186 317 287 217 191 245 163 260 222
11 222 211 213 183 332 287 217 185 203 164 251 218
12 220 209 216 181 303 296 213 184 195 162 244 216
13 217 204 211 205 334 270 210 180 193 175 237 223
14 214 208 211 183 292 278 211 181 194 699 232 231
15 212 207 206 183 281 285 212 182 199 286 234 224
16 213 202 203 183 290 281 212 198 198 232 231 220
17 223 203 205 183 436 296 208 209 196 215 232 217
18 234 207 200 241 527 279 214 196 202 202 231 213
19 235 205 202 216 413 264 209 196 194 196 228 227
20 224 235 235 230 475 266 225 195 194 194 224 212
21 220 244 230 238 334 257 212 203 168 193 221 208
22 273 222 221 224 310 267 208 202 175 189 225 209
23 233 222 218 222 299 260 211 200 184 193 223 204
24 245 215 213 220 1,090 254 210 196 174 212 220 204
25 392 209 208 214 952 249 207 193 173 223 220 202
26 260 206 205 206 940 244 205 212 284 230 224 199
27 233 205 208 208 574 248 211 256 251 211 219 234
28 226 204 284 207 526 245 204 241 225 199 219 252
29 225 201 260 212 528 287 201 206 260 191 226 226
30 221   218 207 485 249 195 204 202 922 230 217
31 220   210   488   193 202   1,960   220