Observed and urbanization-adjusted annual maximum peak discharge and associated urban fraction and precipitation values at USGS streamgage:
05528500 BUFFALO CREEK NEAR WHEELING, IL
| Water year | Segment | Discharge code | Cumulative reservoir storage (acre-feet) | Urban fraction | Precipitation (inches) | Observed peak discharge (ft3/s) | Adjusted peak discharge (ft3/s) | Exceedance probability |
| 1953 | 1 | E | 0 | 0.095 | 0.598 | 55 | 192 | 0.969 |
| 1954 | 1 | -- | 0 | 0.107 | 1.361 | 268 | 476 | 0.454 |
| 1955 | 1 | -- | 0 | 0.118 | 2.923 | 161 | 335 | 0.775 |
| 1956 | 1 | E | 0 | 0.130 | 1.180 | 110 | 270 | 0.899 |
| 1957 | 1 | -- | 0 | 0.141 | 1.870 | 430 | 644 | 0.179 |
| 1958 | 1 | E | 0 | 0.153 | 0.209 | 130 | 288 | 0.867 |
| 1959 | 1 | 2 | 0 | 0.165 | 0.392 | 320 | 516 | 0.372 |
| 1960 | 1 | -- | 0 | 0.176 | 0.456 | 457 | 660 | 0.167 |
| 1961 | 1 | -- | 0 | 0.197 | 1.298 | 370 | 554 | 0.296 |
| 1962 | 1 | -- | 0 | 0.218 | 0.254 | 318 | 494 | 0.417 |
| 1963 | 1 | E | 0 | 0.239 | 1.239 | 76 | 197 | 0.965 |
| 1964 | 1 | -- | 0 | 0.260 | 0.877 | 264 | 412 | 0.599 |
| 1965 | 1 | -- | 0 | 0.281 | 0.089 | 274 | 416 | 0.588 |
| 1966 | 1 | -- | 0 | 0.302 | 0.455 | 343 | 488 | 0.430 |
| 1967 | 1 | -- | 0 | 0.323 | 1.355 | 758 | 918 | 0.051 |
| 1968 | 1 | -- | 0 | 0.344 | 1.326 | 617 | 756 | 0.105 |
| 1969 | 1 | -- | 0 | 0.365 | 1.368 | 335 | 453 | 0.503 |
| 1970 | 1 | D | 0 | 0.386 | 1.497 | 600 | 712 | 0.134 |
| 1971 | 1 | E | 0 | 0.414 | 0.402 | 350 | 448 | 0.513 |
| 1972 | 1 | -- | 0 | 0.442 | 1.164 | 802 | 884 | 0.059 |
| 1973 | 1 | -- | 0 | 0.470 | 1.382 | 454 | 527 | 0.349 |
| 1974 | 1 | -- | 0 | 0.498 | 0.605 | 424 | 487 | 0.432 |
| 1975 | 1 | -- | 0 | 0.526 | 0.918 | 388 | 439 | 0.533 |
| 1976 | 1 | -- | 0 | 0.554 | 1.170 | 458 | 494 | 0.419 |
| 1977 | 1 | E | 0 | 0.582 | 0.814 | 116 | 164 | 0.983 |
| 1978 | 1 | -- | 0 | 0.610 | 1.320 | 372 | 389 | 0.648 |
| 1979 | 1 | -- | 0 | 0.638 | 1.005 | 409 | 411 | 0.598 |
| 1980 | 1 | -- | 0 | 0.666 | 0.675 | 571 | 537 | 0.324 |
| 1981 | 1 | -- | 0 | 0.675 | 1.138 | 597 | 554 | 0.291 |
| 1982 | 1 | -- | 0 | 0.684 | 1.867 | 887 | 798 | 0.086 |
| 1983 | 0 | -- | 220 | 0.692 | 1.596 | 610 | 635 | 0.189 |
| 1984 | 2 | -- | 220 | 0.701 | 1.195 | 382 | 472 | 0.465 |
| 1985 | 2 | -- | 220 | 0.709 | 1.237 | 455 | 547 | 0.303 |
| 1986 | 2 | -- | 220 | 0.718 | 0.740 | 596 | 699 | 0.144 |
| 1987 | 2 | -- | 220 | 0.726 | 2.442 | 717 | 829 | 0.073 |
| 1988 | 2 | -- | 220 | 0.735 | 0.434 | 308 | 374 | 0.691 |
| 1989 | 2 | -- | 220 | 0.743 | 1.374 | 352 | 418 | 0.580 |
| 1990 | 2 | -- | 720 | 0.752 | 1.563 | 613 | 697 | 0.146 |
| 1991 | 2 | -- | 720 | 0.755 | 1.762 | 374 | 437 | 0.539 |
| 1992 | 2 | E | 720 | 0.758 | 0.551 | 213 | 264 | 0.910 |
| 1993 | 2 | CE | 720 | 0.761 | 0.929 | 287 | 340 | 0.763 |
| 1994 | 2 | C | 720 | 0.765 | 1.411 | 437 | 501 | 0.405 |
| 1995 | 2 | C | 720 | 0.768 | 1.034 | 337 | 391 | 0.646 |
| 1996 | 2 | C | 720 | 0.771 | 0.286 | 670 | 747 | 0.112 |
| 1997 | 2 | CE | 720 | 0.774 | 2.249 | 541 | 604 | 0.220 |
| 1998 | 2 | CE | 720 | 0.778 | 0.777 | 272 | 318 | 0.810 |
| 1999 | 2 | C | 720 | 0.781 | 1.045 | 621 | 687 | 0.152 |
| 2000 | 2 | C | 720 | 0.784 | 1.745 | 272 | 315 | 0.814 |
| 2001 | 2 | C | 720 | 0.795 | 2.455 | 680 | 742 | 0.116 |
| 2002 | 2 | C | 720 | 0.805 | 1.519 | 742 | 801 | 0.085 |
| 2003 | 2 | CE | 720 | 0.816 | 1.189 | 193 | 221 | 0.952 |
| 2004 | 2 | C | 720 | 0.827 | 1.227 | 495 | 529 | 0.341 |
| 2005 | 2 | CE | 720 | 0.838 | 0.574 | 247 | 269 | 0.903 |
| 2006 | 2 | C | 720 | 0.848 | 1.255 | 338 | 357 | 0.728 |
| 2007 | 2 | C | 720 | 0.859 | 1.673 | 830 | 854 | 0.066 |
| 2008 | 2 | C | 720 | 0.870 | 3.298 | 664 | 677 | 0.160 |
| 2009 | 2 | C | 720 | 0.881 | 0.596 | 444 | 449 | 0.513 |