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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 -> 2021-09-30)

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
1 451 262 255 239 342 510 365 165 273 204 286 200
2 245 305 284 224 451 598 239 217 254 178 263 195
3 234 362 257 219 884 415 269 802 214 183 458 195
4 225 860 280 222 429 622 381 192 178 721 1,310 195
5 233 430 242 227 334 756 335 148 236 852 431 201
6 228 356 322 286 333 539 463 144 207 270 562 206
7 224 276 362 263 309 438 245 149 194 277 374 203
8 230 248 281 258 284 292 200 139 1,080 383 361 219
9 217 300 284 246 404 495 171 124 500 538 298 222
10 211 249 436 281 460 360 159 132 945 498 265 222
11 208 230 570 347 638 325 220 189 855 291 250 303
12 202 238 552 264 616 403 642 288 229 277 238 217
13 208 238 403 233 551 364 236 338 196 1,010 222 202
14 202 232 319 209 490 288 180 220 182 1,630 211 202
15 205 222 274 339 469 274 169 202 179 1,180 326 257
16 207 269 334 764 557 415 185 527 213 2,460 616 224
17 245 257 275 371 555 522 248 373 252 643 762 210
18 340 293 394 326 585 860 197 242 645 430 421 206
19 353 258 318 343 716 665 191 189 314 571 360 223
20 488 752 329 302 497 397 250 184 249 634 276 638
21 528 362 330 371 398 237 176 155 230 329 253 608
22 290 358 329 336 370 607 145 144 406 257 229 325
23 238 509 269 497 282 1,190 145 246 500 248 231 266
24 224 468 242 547 409 420 146 334 751 598 248 223
25 211 447 234 656 567 994 169 254 548 402 282 207
26 222 403 271 378 674 578 180 211 305 285 233 222
27 236 320 344 478 661 847 175 200 474 256 222 231
28 217 279 328 459 663 362 142 201 278 758 223 216
29 312 239 278 408 538 410 131 681 221 809 218 212
30 242   251 364 461 402 122 591 257 415 208 272
31 228   267   463   136 437   365   799