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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 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 322.21 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 1983-10-01 -> 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
1 388 368 384 402 353 793 676 275 243 208 748 355
2 380 378 381 358 357 617 648 273 237 206 445 357
3 462 430 402 358 336 817 804 274 224 220 399 371
4 399 679 612 366 453 1,050 775 268 229 232 563 473
5 376 701 608 488 423 714 659 259 225 212 625 392
6 366 508 485 481 426 524 827 252 243 230 436 349
7 353 452 432 403 336 898 521 248 296 216 394 331
8 352 437 407 497 323 718 454 247 260 211 349 455
9 367 408 390 384 434 691 395 242 329 405 345 370
10 394 417 399 358 447 925 372 240 304 248 324 369
11 367 409 389 356 426 807 354 236 255 241 307 348
12 352 469 789 457 361 737 358 232 271 245 300 373
13 362 385 655 367 348 662 336 229 256 309 303 350
14 388 364 499 392 407 588 318 224 231 562 330 330
15 381 361 412 369 411 536 337 222 239 464 361 373
16 411 357 423 346 409 458 334 224 236 292 781 459
17 402 352 491 353 457 423 358 238 290 382 638 367
18 568 392 422 460 628 467 411 280 236 2,450 843 347
19 438 356 393 378 482 443 348 239 238 740 485 364
20 375 434 456 349 583 394 346 225 249 610 436 417
21 357 537 429 357 414 404 651 242 245 395 428 729
22 361 499 405 342 492 573 611 228 224 401 1,120 1,210
23 376 439 387 317 473 960 396 238 227 459 1,070 1,000
24 359 490 359 421 1,050 549 401 233 224 603 628 590
25 715 536 345 395 812 454 438 230 228 596 569 458
26 472 536 340 359 765 430 399 248 219 459 485 447
27 539 447 406 344 577 402 336 582 257 397 470 459
28 454 410 437 331 478 390 320 420 226 357 437 480
29 398 354 526 309 562 410 312 249 301 329 383 454
30 394   392 307 671 540 320 232 227 370 365 407
31 376   482   838   293 273   1,390   409