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USGS Surface-Water 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 08172000 San Marcos Rv at Luling, TX


Caldwell County, Texas
Hydrologic Unit Code 12100203
Latitude  29°39'58", Longitude  97°39'02" NAD27
Drainage area 838  square miles
Contributing drainage area 838  square miles
Gage datum 322.05 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 1983-10-01 -> 2024-09-30)

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
1 388 372 390 409 358 802 690 279 247 211 748 355
2 380 382 387 363 363 625 661 276 241 209 445 357
3 462 428 408 363 340 833 822 278 227 224 399 371
4 399 688 623 372 459 1,070 792 272 232 236 563 473
5 376 712 620 497 429 729 673 263 228 215 625 392
6 366 516 494 490 432 534 844 256 247 234 436 349
7 353 458 439 410 340 918 532 251 301 220 394 331
8 352 443 413 506 327 733 463 251 264 214 349 455
9 367 414 396 390 441 705 403 246 335 413 345 370
10 394 422 405 363 454 946 379 242 309 253 324 369
11 367 415 395 361 430 824 360 237 259 245 307 348
12 352 476 806 465 365 751 364 234 276 249 300 373
13 362 390 668 373 353 673 342 231 261 315 303 350
14 388 369 508 399 413 599 324 227 235 574 330 330
15 381 366 419 375 417 546 342 225 243 473 361 373
16 411 362 430 352 416 466 340 227 239 297 781 459
17 402 356 499 359 465 431 364 242 295 390 638 367
18 568 398 428 469 641 475 419 284 240 2,450 843 347
19 438 361 398 385 491 451 353 242 242 740 485 364
20 375 441 464 355 594 400 352 228 254 610 436 417
21 357 546 436 363 422 410 661 246 249 395 428 729
22 361 508 411 347 502 583 622 231 228 401 1,120 1,210
23 365 446 393 322 482 980 403 241 231 459 1,070 1,000
24 350 498 364 429 1,080 559 406 237 228 603 628 590
25 689 545 350 402 829 462 444 233 231 596 569 458
26 465 546 344 365 782 437 405 252 223 459 485 447
27 540 454 413 350 589 409 341 594 261 397 470 459
28 455 416 445 336 487 397 325 428 230 357 437 480
29 400 373 536 313 573 417 316 253 307 329 383 454
30 398   398 311 684 551 325 236 230 370 365 407
31 380   490   854   297 278   1,390   409