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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 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 1,225.36 feet above NGVD29
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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 1967-10-01 -> 2022-09-30)

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
1 454 184 198 189 208 414 228 240 207 216 272 202
2 239 211 193 186 385 342 239 308 359 171 250 198
3 219 241 191 189 660 317 241 768 201 158 921 197
4 210 367 200 189 343 553 224 197 198 248 1,820 196
5 202 304 207 188 301 350 302 158 184 488 365 196
6 197 250 218 199 246 261 248 187 169 309 386 196
7 194 220 266 218 214 292 183 184 162 240 287 195
8 190 209 225 221 246 244 159 163 1,490 799 267 197
9 191 202 219 210 298 300 153 137 508 641 251 198
10 189 196 210 223 352 263 148 136 194 432 237 195
11 186 196 228 220 761 265 196 138 171 221 224 195
12 185 194 243 198 363 411 745 424 170 272 214 193
13 184 192 241 191 252 277 185 324 177 1,930 210 192
14 183 189 219 184 296 253 153 283 162 1,260 206 192
15 183 187 207 383 293 219 145 212 162 355 585 194
16 184 207 230 754 353 270 233 177 175 2,920 713 192
17 184 192 210 400 258 636 228 328 300 575 1,170 188
18 184 195 205 367 291 391 174 264 694 300 381 186
19 182 194 201 333 244 226 162 175 261 509 287 187
20 181 185 251 252 234 195 158 153 209 559 257 224
21 179 188 280 286 314 181 145 158 257 311 242 293
22 178 190 259 239 287 203 156 146 505 246 232 254
23 176 212 221 240 220 175 148 165 300 293 229 231
24 175 221 205 213 329 180 179 368 205 900 222 215
25 174 302 198 198 538 193 198 251 197 377 223 205
26 182 232 205 186 686 170 291 213 221 271 225 207
27 189 208 358 221 406 238 182 182 326 276 221 205
28 188 200 276 244 316 206 167 298 220 246 214 197
29 212 228 226 217 359 215 148 853 191 333 208 194
30 196   212 199 351 332 139 849 333 388 204 193
31 189   199   306   203 399   297   1,300