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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 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
1 434 253 247 231 331 508 349 161 297 228 281 196
2 238 293 275 215 441 581 229 211 253 190 258 191
3 227 347 249 211 860 409 257 768 256 183 444 190
4 218 815 271 215 418 607 365 186 214 693 1,260 190
5 226 411 234 219 368 730 320 145 243 816 418 196
6 221 341 311 275 336 525 444 140 209 262 542 201
7 216 266 349 254 305 425 241 145 193 269 362 198
8 222 239 272 249 277 286 195 135 1,040 369 350 213
9 210 288 275 238 391 478 167 121 481 517 290 216
10 204 241 419 270 447 347 154 128 905 478 258 216
11 201 224 547 334 615 314 212 182 819 280 243 293
12 196 232 530 254 592 388 614 276 222 267 232 211
13 201 231 388 225 530 351 226 324 190 964 217 196
14 195 225 308 202 470 278 172 212 177 1,560 206 196
15 199 215 265 326 452 265 162 195 174 1,130 316 250
16 200 260 322 730 538 399 177 504 206 2,350 592 217
17 236 248 266 356 538 501 238 357 243 616 731 204
18 325 282 379 314 563 822 189 232 617 413 406 200
19 337 248 306 330 687 636 183 182 302 547 347 216
20 464 714 317 291 480 381 239 177 240 607 268 612
21 502 346 318 356 392 229 169 150 222 316 245 583
22 278 342 317 322 359 584 141 139 390 247 223 314
23 230 484 260 476 275 1,140 183 237 480 239 224 258
24 217 446 234 524 395 404 469 323 719 573 241 217
25 204 430 228 630 545 949 225 246 525 386 276 202
26 214 388 263 364 648 553 194 204 294 405 233 216
27 228 309 332 459 634 809 180 193 456 352 221 225
28 210 270 317 441 635 346 146 194 271 749 220 210
29 300 231 268 392 517 393 133 651 216 786 214 206
30 233   243 351 442 384 123 565 253 407 204 263
31 221   258   452   135 421   358   766