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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
1 434 253 245 229 327 503 345 162 297 228 281 196
2 238 293 273 214 437 575 227 212 253 190 258 191
3 227 347 247 210 851 405 255 762 256 183 444 190
4 218 815 269 213 414 603 858 186 214 693 1,260 190
5 226 411 232 218 364 737 481 145 243 816 418 196
6 221 341 308 272 333 527 479 140 209 262 542 201
7 216 266 345 252 302 424 325 145 193 269 362 198
8 222 239 270 247 274 284 227 135 1,040 369 350 213
9 210 288 273 235 387 473 191 121 481 517 290 216
10 204 241 415 268 442 344 224 128 905 478 258 216
11 201 224 541 331 608 312 223 182 819 280 243 293
12 196 232 525 252 585 406 616 276 222 267 232 211
13 201 231 384 223 524 361 559 324 190 964 217 196
14 195 225 305 200 465 282 447 212 177 1,560 206 196
15 199 215 262 323 447 268 225 195 174 1,130 316 250
16 200 260 319 722 532 398 207 504 206 2,350 592 217
17 236 248 263 352 532 498 256 357 243 616 731 204
18 325 282 375 310 557 815 202 232 617 413 406 200
19 337 248 303 326 679 630 194 182 302 547 347 216
20 464 714 313 288 475 378 248 177 240 607 268 612
21 502 346 314 352 388 228 177 150 222 316 245 583
22 278 342 314 319 356 578 149 139 390 247 223 314
23 230 484 257 472 277 1,120 189 237 480 239 224 258
24 217 446 232 518 392 400 471 323 719 573 241 217
25 204 426 226 623 539 939 228 246 525 386 276 202
26 214 385 260 361 642 547 198 204 294 405 233 216
27 228 306 329 455 637 800 183 193 456 352 221 225
28 210 268 314 437 638 343 148 194 271 749 220 210
29 300 231 266 388 515 388 136 651 216 786 214 206
30 233   241 347 443 380 125 565 253 407 204 263
31 221   256   449   137 421   358   766