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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 970.01 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 -> 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
1 446 258 251 235 337 504 357 161 271 233 284 199
2 243 300 280 219 450 589 234 212 252 195 261 194
3 232 356 253 215 869 415 263 783 212 188 454 193
4 223 842 275 219 423 618 373 188 177 716 1,300 193
5 231 423 238 223 329 745 327 146 234 844 428 200
6 226 350 316 280 327 533 454 141 205 269 557 205
7 221 272 355 259 304 433 243 146 192 275 371 201
8 227 245 277 254 279 290 198 136 1,070 380 358 217
9 214 295 280 242 396 487 169 122 494 533 296 221
10 209 246 428 275 451 354 157 130 934 493 263 220
11 205 227 558 341 624 319 216 185 845 288 248 301
12 200 235 541 259 602 395 628 281 227 274 236 215
13 205 235 395 229 539 357 231 330 194 997 221 200
14 199 229 314 205 479 282 176 216 181 1,610 210 200
15 203 220 270 333 460 269 165 198 177 1,170 323 255
16 205 266 328 747 545 407 181 515 211 2,440 610 222
17 242 254 271 364 543 511 243 365 250 636 754 208
18 334 289 387 320 572 841 193 237 637 426 417 205
19 347 254 312 337 700 650 187 185 311 566 356 221
20 478 737 323 296 487 389 244 180 247 628 274 631
21 517 356 324 363 390 233 172 152 228 326 251 602
22 286 352 323 329 363 593 142 141 402 255 227 323
23 236 499 265 486 278 1,160 142 241 495 246 229 264
24 222 459 238 535 402 411 143 331 743 591 246 221
25 209 438 232 642 556 970 166 252 542 398 280 206
26 219 396 267 371 660 565 176 209 302 282 231 220
27 233 315 338 468 647 827 171 198 469 254 220 229
28 214 275 323 450 648 354 139 199 276 750 221 214
29 307 239 273 400 528 401 129 673 220 800 216 210
30 238   248 358 451 393 119 584 259 411 207 270
31 225   263   454   133 432   361   791