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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 11525500 TRINITY R A LEWISTON CA


Trinity County, California
Hydrologic Unit Code 18010211
Latitude  40°43'29", Longitude 122°48'04" NAD83
Drainage area 719  square miles
Gage datum 1,821.45 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 1961-10-01 -> 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
1 500 533 619 640 1,550 1,470 717 406 484 359 292 311
2 495 519 639 612 1,650 1,410 701 396 506 360 293 314
3 494 498 639 606 1,640 1,370 689 392 488 360 292 313
4 495 473 652 604 1,720 1,320 672 385 490 360 293 312
5 501 478 670 611 1,780 1,290 662 383 493 360 294 311
6 510 480 674 625 1,910 1,270 653 384 493 360 293 311
7 518 482 676 603 1,890 1,260 640 384 467 358 293 309
8 506 501 699 586 1,870 1,210 623 385 454 357 294 307
9 499 505 695 592 1,870 1,180 617 385 474 356 294 308
10 519 514 647 603 1,910 1,190 599 385 471 355 294 305
11 523 505 626 600 1,870 1,220 582 383 452 355 301 300
12 552 479 604 622 1,850 1,240 563 380 448 356 308 297
13 570 500 597 658 1,870 1,220 541 389 457 355 308 303
14 545 584 567 719 1,880 1,210 505 391 442 351 305 321
15 521 575 569 806 1,870 1,180 490 393 431 341 300 327
16 573 549 602 946 1,840 1,120 491 395 433 310 299 332
17 661 565 608 1,080 1,790 1,040 485 424 463 294 299 333
18 692 571 601 1,060 1,750 965 470 415 463 291 300 333
19 706 563 599 1,000 1,770 931 467 404 443 291 306 341
20 703 586 626 997 1,670 911 456 407 436 290 309 390
21 688 591 632 1,090 1,620 890 443 451 435 290 310 389
22 679 618 605 1,120 1,610 885 431 444 418 289 309 387
23 643 669 574 1,170 1,600 861 429 456 389 289 309 386
24 592 700 551 1,180 1,580 841 432 476 378 289 307 427
25 609 702 570 1,180 1,540 819 435 499 376 289 307 469
26 592 670 600 1,290 1,520 814 433 531 374 290 316 452
27 598 632 602 1,360 1,490 800 442 545 372 291 315 453
28 589 613 625 1,430 1,530 771 443 522 368 291 312 466
29 537 853 649 1,530 1,530 740 432 526 365 290 313 487
30 524   725 1,510 1,510 724 420 497 365 289 312 502
31 534   678   1,480   411 487   290   490