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USGS Daily Statistics for Pennsylvania

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[!] Over the next year, the USGS Pennsylvania Water Science Center will be updating the geodetic vertical elevation (gage datum) for many locations. Click HERE for additional information including a current list of streamgages with upcoming datum changes. This update in gage datum does not affect the location of the streamgage, nor the observed local gage height or discharge recorded at the streamgage.


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 01573000 Swatara Creek at Harper Tavern, PA


Lebanon County, Pennsylvania
Hydrologic Unit Code 02050305
Latitude  40°24'09", Longitude  76°34'39" NAD27
Drainage area 337  square miles
Gage datum 356.03 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 1918-10-01 -> 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
1 678 592 900 1,030 775 552 393 276 352 454 493 775
2 746 638 919 1,100 648 553 375 304 458 339 464 784
3 709 696 880 1,150 664 521 388 281 322 368 533 688
4 698 746 934 1,090 695 488 319 366 247 310 431 714
5 646 663 1,160 1,060 717 481 344 295 238 291 415 833
6 685 576 1,180 1,100 694 565 335 260 306 300 395 839
7 651 704 1,100 1,100 697 488 324 277 421 259 404 824
8 669 707 999 946 660 454 392 257 729 270 428 761
9 718 572 988 944 672 396 326 260 425 321 556 717
10 739 542 995 920 662 380 342 267 269 368 456 675
11 628 636 1,140 859 656 431 294 270 252 293 408 777
12 580 701 1,220 865 751 437 294 336 227 273 437 810
13 578 675 1,120 886 713 487 305 430 294 256 556 790
14 585 745 1,090 877 661 444 323 397 266 279 458 842
15 604 751 1,150 944 682 369 313 259 262 306 466 733
16 576 702 1,010 1,060 717 351 312 230 232 285 526 710
17 558 698 1,000 1,120 781 330 338 297 255 314 637 733
18 543 678 989 875 648 397 308 284 371 319 542 748
19 603 720 962 775 697 417 313 337 412 422 510 653
20 766 733 1,040 769 725 440 307 215 314 438 537 597
21 759 765 1,090 719 671 487 304 242 241 402 550 789
22 751 797 1,260 713 728 722 316 272 257 328 588 722
23 655 849 1,160 695 723 759 468 263 295 395 627 665
24 801 1,000 1,120 658 609 455 523 389 280 416 512 694
25 972 1,060 1,060 703 597 373 469 304 305 396 595 788
26 902 1,100 1,000 671 660 484 363 235 397 415 628 720
27 872 943 1,070 679 591 467 299 192 434 430 568 680
28 790 954 1,080 743 554 644 246 256 435 474 704 642
29 659 769 1,050 707 658 556 272 225 352 478 813 645
30 630   928 682 637 451 299 184 410 476 718 707
31 652   982   600   240 230   441   683