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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 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 970.08 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 1938-10-01 -> 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
1 438 254 247 231 331 508 349 161 297 228 284 197
2 240 295 275 215 441 581 229 211 253 190 261 192
3 229 350 249 211 860 409 257 768 256 183 448 192
4 220 824 271 215 418 607 365 186 214 693 1,270 191
5 228 415 234 219 368 730 320 145 243 816 422 198
6 223 344 311 275 336 525 444 140 209 262 548 203
7 218 268 349 254 305 425 241 145 193 269 366 199
8 224 241 272 249 277 286 195 135 1,040 369 353 215
9 211 290 275 238 391 478 167 121 481 522 292 218
10 206 243 419 270 447 347 154 128 905 483 260 217
11 203 226 547 334 615 314 212 182 819 283 245 296
12 198 234 530 254 592 388 614 276 222 269 234 213
13 202 233 388 225 530 351 226 324 190 974 219 198
14 197 227 308 202 470 278 172 212 177 1,580 208 198
15 200 217 265 326 452 265 162 195 174 1,140 319 252
16 202 262 322 730 538 399 177 504 206 2,380 598 219
17 238 250 266 356 538 501 238 357 243 622 739 206
18 328 284 379 314 563 822 189 232 617 417 410 202
19 341 250 306 330 687 636 183 182 302 553 351 218
20 469 721 317 291 480 381 239 177 240 614 270 619
21 507 350 318 356 392 229 169 150 222 319 247 589
22 281 345 317 322 359 584 141 139 390 249 224 317
23 232 489 260 476 275 1,140 183 237 480 241 226 260
24 219 450 234 524 395 404 469 323 719 579 243 218
25 206 430 228 630 545 949 225 246 525 390 278 203
26 216 388 263 364 648 553 194 204 294 409 235 218
27 230 309 332 459 634 809 180 193 456 356 222 226
28 211 270 317 441 635 346 146 194 271 757 222 212
29 302 231 268 392 517 393 133 651 216 794 216 208
30 235   243 351 442 384 123 565 253 411 206 265
31 222   258   452   135 421   361   774