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USGS Surface-Water 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 08151500 Llano Rv at Llano, TX


Llano County, Texas
Hydrologic Unit Code 12090204
Latitude  30°45'04", Longitude  98°40'10" NAD27
Drainage area 4,197  square miles
Contributing drainage area 4,192  square miles
Gage datum 970.01 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 1938-10-01 -> 2019-09-30)

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
1 459 264 257 238 344 514 369 167 279 208 291 202
2 248 307 286 222 454 603 241 221 259 181 267 197
3 236 365 258 217 893 418 271 821 218 186 467 197
4 227 869 282 211 432 628 386 195 181 737 1,340 197
5 236 434 243 216 336 763 338 150 239 871 440 204
6 230 359 323 280 335 544 467 146 210 273 574 209
7 225 279 363 258 311 442 248 152 196 282 380 205
8 231 250 282 255 285 295 202 141 1,110 391 367 222
9 219 302 286 243 407 500 173 126 508 550 303 225
10 212 251 439 278 464 363 161 134 965 509 268 225
11 209 231 575 347 644 328 222 192 874 296 253 308
12 204 239 557 254 622 407 650 294 232 282 241 220
13 209 239 406 225 556 367 238 345 198 1,030 225 204
14 203 233 322 205 494 290 181 225 185 1,670 214 204
15 206 223 276 338 474 277 170 206 181 1,210 331 261
16 208 271 336 768 561 419 187 539 217 2,520 629 227
17 247 259 277 371 559 528 251 382 256 657 778 213
18 342 295 397 326 589 870 199 247 659 439 429 209
19 355 259 319 344 722 672 193 192 320 584 366 225
20 492 759 313 302 500 401 252 188 253 649 280 651
21 532 365 298 372 402 240 178 158 234 335 257 620
22 292 360 272 336 373 613 146 147 415 261 232 331
23 239 513 247 500 283 1,200 146 251 511 252 234 270
24 225 472 230 551 412 425 147 341 768 610 251 226
25 212 450 227 661 569 1,010 172 259 560 409 287 210
26 223 407 266 380 679 585 182 214 311 289 236 225
27 238 323 342 481 666 856 177 203 484 260 225 234
28 218 281 327 462 668 365 144 204 284 775 226 218
29 315 245 276 410 543 414 133 696 225 827 221 214
30 243   249 366 464 406 123 604 261 423 211 276
31 230   266   467   138 446   371   816