Warning: Javascript must be enabled to use all the features on this page!


Page Loading - Please Wait...

* We've detected you're using a mobile device. Find our Next Generation Station Page here.
Click to hideNews Bulletins

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 08150700 Llano Rv nr Mason, TX


Mason County, Texas
Hydrologic Unit Code 12090204
Latitude  30°39'38", Longitude  99°06'32" NAD27
Drainage area 3,247  square miles
Contributing drainage area 3,242  square miles
Gage datum 1,225.60 feet above NAVD88
Output formats
HTML table of all data
Tab-separated data
Reselect output format

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 1967-10-01 -> 2024-09-30)

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
1 440 179 193 181 199 396 217 231 210 210 271 198
2 233 206 186 179 381 327 227 296 350 167 248 195
3 214 234 184 182 632 302 229 738 196 154 892 193
4 205 356 193 182 378 527 212 189 193 240 1,760 192
5 198 295 199 181 328 336 286 152 179 471 356 192
6 193 243 210 191 247 249 236 180 165 299 377 192
7 189 215 255 209 211 279 175 177 159 234 281 191
8 186 204 217 212 239 233 152 156 1,430 770 261 193
9 186 197 211 201 300 286 146 132 491 618 245 193
10 185 192 202 214 340 251 141 131 189 418 232 191
11 182 193 219 211 722 254 187 133 166 215 219 190
12 181 191 233 190 347 391 704 408 165 263 210 189
13 180 188 232 183 243 266 177 312 173 1,850 207 188
14 178 185 211 177 285 243 146 273 158 1,210 203 188
15 179 183 199 365 285 210 138 205 158 343 567 190
16 180 202 221 715 343 257 221 171 171 2,810 690 188
17 180 188 202 381 249 603 217 316 291 555 1,130 184
18 180 190 197 350 279 372 166 254 670 290 370 182
19 178 190 194 317 233 216 154 169 253 491 279 183
20 176 181 241 241 242 193 150 147 204 540 251 219
21 175 183 268 273 304 177 138 152 249 300 236 285
22 174 186 248 229 277 195 148 145 488 238 226 247
23 172 207 212 232 212 168 538 162 291 283 223 225
24 171 215 197 205 316 173 554 355 199 868 217 211
25 171 293 190 191 514 185 243 243 192 364 219 201
26 178 226 197 179 651 163 300 206 217 392 223 203
27 185 203 341 212 387 227 189 176 325 390 221 201
28 184 194 264 234 302 196 171 287 217 266 211 193
29 207 216 217 209 342 205 143 820 187 338 205 190
30 192   204 192 335 315 134 819 322 386 201 189
31 184   191   295   195 388   296   1,260