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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 01576500 Conestoga River at Lancaster, PA


Lancaster County, Pennsylvania
Hydrologic Unit Code 02050306
Latitude  40°03'00", Longitude  76°16'39" NAD27
Drainage area 324  square miles
Gage datum 245.63 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 1928-10-01 -> 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
1 452 458 659 700 597 400 298 276 274 313 274 394
2 533 483 667 747 499 465 274 278 352 272 246 394
3 505 576 623 761 507 413 305 271 274 295 307 356
4 516 601 662 718 520 390 293 398 235 225 261 377
5 469 523 734 715 487 370 267 301 203 218 243 428
6 486 482 706 709 558 378 292 237 248 211 248 436
7 468 606 714 706 520 364 337 259 276 197 250 455
8 459 548 627 669 489 361 360 240 456 233 263 414
9 499 457 641 664 479 326 293 250 397 324 346 398
10 523 457 651 682 465 322 322 254 235 259 261 406
11 445 486 720 628 456 355 312 263 263 268 261 489
12 443 511 734 621 460 387 311 224 269 256 282 490
13 437 506 709 652 486 411 359 344 248 213 302 510
14 446 585 721 618 490 370 342 284 207 194 282 523
15 467 541 770 630 428 314 384 218 232 217 290 451
16 426 546 660 771 463 320 306 198 262 226 288 458
17 387 540 630 714 503 365 284 242 318 237 350 492
18 426 540 642 586 435 315 308 277 259 246 316 520
19 467 540 634 558 492 366 286 316 283 300 279 431
20 543 547 676 572 463 332 263 229 210 288 306 397
21 512 541 700 524 438 365 352 224 192 256 305 496
22 485 558 864 538 412 621 321 364 220 220 333 445
23 439 582 783 520 501 826 331 293 259 248 355 421
24 516 651 758 504 440 347 398 376 253 242 292 425
25 637 734 692 547 390 298 259 230 280 218 389 486
26 692 753 665 534 422 329 276 219 264 236 366 429
27 639 704 736 565 389 383 354 197 270 261 345 450
28 588 678 728 552 386 426 394 270 284 289 386 438
29 495 587 733 538 415 386 340 231 251 285 430 419
30 476   657 519 427 328 306 197 337 366 412 458
31 521   677   390   253 189   281   432