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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 03047000 Loyalhanna Creek at Loyalhanna Dam, PA


Westmoreland County, Pennsylvania
Hydrologic Unit Code 05010008
Latitude  40°27'32", Longitude  79°26'58" NAD83
Drainage area 290  square miles
Gage datum 870.18 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 1939-10-01 -> 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
1 653 697 920 831 610 527 383 197 182 174 276 513
2 678 685 948 876 597 507 363 194 182 176 283 498
3 721 696 1,020 933 601 456 330 198 179 196 272 456
4 754 745 947 973 607 487 327 194 186 211 279 446
5 806 827 862 1,010 630 562 308 230 186 231 279 437
6 868 891 883 1,030 628 436 289 233 187 238 274 474
7 797 850 1,030 1,020 670 375 286 231 180 238 280 506
8 708 866 1,130 1,010 649 339 253 222 175 228 277 503
9 645 844 1,170 1,020 684 349 221 210 180 196 252 533
10 550 769 1,190 1,020 724 345 227 210 186 177 257 554
11 509 732 1,170 990 713 334 250 201 212 173 273 578
12 540 742 1,130 952 707 375 274 185 210 178 276 587
13 567 756 1,120 863 731 337 284 184 204 187 293 583
14 585 757 1,050 828 731 330 293 194 206 190 287 601
15 599 716 1,000 771 728 393 286 190 220 195 278 583
16 610 739 1,010 741 727 422 258 197 219 192 275 555
17 639 834 1,010 838 706 434 235 182 200 186 277 545
18 633 884 943 928 689 448 222 176 229 225 308 528
19 567 864 909 934 673 441 212 181 241 223 349 537
20 562 859 899 947 673 413 193 178 229 212 369 563
21 583 848 837 820 611 371 179 151 224 241 360 559
22 565 855 879 700 584 359 180 139 213 235 362 526
23 536 856 935 618 569 369 210 141 199 215 346 553
24 581 854 946 620 522 388 234 150 184 218 345 622
25 629 855 925 652 503 401 229 155 167 214 359 673
26 617 846 961 674 486 382 209 153 179 185 398 711
27 640 885 941 674 490 353 184 151 197 178 404 703
28 689 930 918 675 459 370 165 150 214 201 397 696
29 682 820 869 706 496 386 162 186 195 220 425 693
30 705   848 662 537 383 166 201 181 224 478 661
31 702   886   559   191 195   240   667