Observed and urbanization-adjusted annual maximum peak discharge and associated urban fraction and precipitation values at USGS streamgage:
04087204 OAK CREEK AT SOUTH MILWAUKEE, WI
| 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 |
| 1964 | 1 | -- | 0 | 0.434 | 2.404 | 398 | 580 | 0.538 |
| 1965 | 1 | -- | 0 | 0.446 | 1.127 | 480 | 676 | 0.395 |
| 1966 | 1 | -- | 0 | 0.458 | 0.730 | 526 | 721 | 0.330 |
| 1967 | 1 | -- | 0 | 0.470 | 1.980 | 612 | 811 | 0.227 |
| 1968 | 1 | -- | 0 | 0.481 | 1.974 | 606 | 796 | 0.241 |
| 1969 | 1 | -- | 0 | 0.493 | 2.241 | 704 | 905 | 0.167 |
| 1970 | 1 | -- | 0 | 0.505 | 1.144 | 399 | 541 | 0.603 |
| 1971 | 1 | -- | 0 | 0.516 | 0.717 | 441 | 585 | 0.530 |
| 1972 | 1 | -- | 0 | 0.527 | 1.708 | 916 | 1130 | 0.075 |
| 1973 | 1 | -- | 0 | 0.537 | 2.740 | 774 | 954 | 0.143 |
| 1974 | 1 | -- | 0 | 0.548 | 0.769 | 839 | 1020 | 0.111 |
| 1975 | 1 | -- | 0 | 0.559 | 1.682 | 581 | 719 | 0.333 |
| 1976 | 1 | -- | 0 | 0.570 | 2.232 | 935 | 1110 | 0.080 |
| 1977 | 1 | -- | 0 | 0.580 | 1.844 | 378 | 477 | 0.712 |
| 1978 | 1 | -- | 0 | 0.591 | 1.696 | 1020 | 1190 | 0.064 |
| 1979 | 1 | -- | 0 | 0.602 | 1.483 | 660 | 774 | 0.262 |
| 1980 | 1 | -- | 0 | 0.613 | 1.774 | 541 | 640 | 0.448 |
| 1981 | 1 | -- | 0 | 0.616 | 1.497 | 472 | 560 | 0.569 |
| 1982 | 1 | -- | 0 | 0.620 | 1.204 | 492 | 580 | 0.538 |
| 1983 | 1 | -- | 0 | 0.624 | 2.014 | 670 | 769 | 0.267 |
| 1984 | 1 | -- | 0 | 0.628 | 1.492 | 450 | 529 | 0.621 |
| 1985 | 1 | -- | 0 | 0.632 | 0.723 | 403 | 477 | 0.712 |
| 1986 | 1 | -- | 0 | 0.635 | 6.455 | 1140 | 1270 | 0.048 |
| 1987 | 1 | -- | 0 | 0.639 | 1.633 | 457 | 530 | 0.619 |
| 1988 | 1 | -- | 0 | 0.643 | 1.469 | 568 | 650 | 0.434 |
| 1989 | 1 | -- | 0 | 0.647 | 1.255 | 422 | 489 | 0.693 |
| 1990 | 1 | -- | 0 | 0.650 | 2.378 | 817 | 908 | 0.166 |
| 1991 | 1 | -- | 0 | 0.662 | 0.925 | 451 | 511 | 0.653 |
| 1992 | 1 | -- | 0 | 0.673 | 2.222 | 508 | 565 | 0.562 |
| 1993 | 1 | -- | 0 | 0.685 | 1.964 | 887 | 955 | 0.143 |
| 1994 | 1 | 18 | 0 | 0.696 | 0.893 | 600 | 647 | 0.438 |
| 1995 | 1 | -- | 0 | 0.708 | 0.710 | 438 | 471 | 0.721 |
| 1996 | 1 | -- | 0 | 0.719 | 2.072 | 573 | 603 | 0.503 |
| 1997 | 1 | -- | 0 | 0.731 | 4.021 | 1110 | 1140 | 0.072 |
| 1998 | 1 | -- | 0 | 0.742 | 0.669 | 542 | 557 | 0.575 |
| 1999 | 1 | -- | 0 | 0.754 | 1.498 | 1060 | 1070 | 0.093 |
| 2000 | 1 | -- | 0 | 0.766 | 4.131 | 1120 | 1120 | 0.077 |
| 2001 | 1 | -- | 0 | 0.766 | 1.169 | 798 | 798 | 0.239 |
| 2002 | 1 | -- | 0 | 0.766 | 1.151 | 511 | 511 | 0.653 |
| 2003 | 1 | -- | 0 | 0.766 | 0.651 | 267 | 267 | 0.953 |
| 2004 | 1 | -- | 0 | 0.766 | 1.464 | 732 | 732 | 0.311 |
| 2005 | 1 | -- | 0 | 0.766 | 2.164 | 611 | 611 | 0.492 |
| 2006 | 1 | -- | 0 | 0.766 | 1.028 | 772 | 772 | 0.264 |
| 2007 | 1 | -- | 0 | 0.766 | 1.523 | 590 | 590 | 0.523 |
| 2008 | 1 | -- | 0 | 0.766 | 4.628 | 2370 | 2370 | 0.007 |
| 2009 | 1 | -- | 0 | 0.766 | 2.287 | 774 | 774 | 0.262 |