Observed and urbanization-adjusted annual maximum peak discharge and associated urban fraction and precipitation values at USGS streamgage:
05551700 BLACKBERRY CREEK NEAR YORKVILLE, 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 |
| 1961 | 1 | -- | 157 | 0.069 | 1.361 | 455 | 700 | 0.672 |
| 1962 | 1 | -- | 157 | 0.073 | 0.328 | 1000 | 1380 | 0.172 |
| 1963 | 1 | -- | 157 | 0.076 | 1.449 | 472 | 717 | 0.656 |
| 1964 | 1 | -- | 157 | 0.079 | 1.017 | 159 | 298 | 0.955 |
| 1965 | 1 | 2 | 157 | 0.083 | 0.136 | 605 | 886 | 0.491 |
| 1966 | 1 | D | 283 | 0.086 | 1.502 | 906 | 1250 | 0.226 |
| 1967 | 1 | -- | 283 | 0.089 | 1.201 | 618 | 897 | 0.481 |
| 1968 | 1 | -- | 283 | 0.093 | 1.146 | 289 | 471 | 0.869 |
| 1969 | 1 | -- | 283 | 0.096 | 0.100 | 578 | 839 | 0.537 |
| 1970 | 1 | -- | 283 | 0.099 | 1.474 | 1300 | 1740 | 0.083 |
| 1971 | 1 | DE | 283 | 0.103 | 0.375 | 686 | 971 | 0.417 |
| 1972 | 1 | -- | 283 | 0.108 | 1.050 | 546 | 788 | 0.592 |
| 1973 | 1 | -- | 283 | 0.112 | 0.625 | 619 | 878 | 0.498 |
| 1974 | 1 | -- | 283 | 0.117 | 1.359 | 1320 | 1730 | 0.083 |
| 1975 | 1 | -- | 283 | 0.121 | 1.144 | 483 | 698 | 0.674 |
| 1976 | 1 | -- | 283 | 0.125 | 1.101 | 637 | 889 | 0.488 |
| 1977 | 1 | E | 283 | 0.130 | 1.215 | 172 | 295 | 0.956 |
| 1978 | 1 | -- | 283 | 0.134 | 2.541 | 1030 | 1350 | 0.184 |
| 1979 | 1 | -- | 283 | 0.138 | 0.386 | 1250 | 1620 | 0.105 |
| 1980 | 1 | E | 283 | 0.143 | 0.672 | 210 | 342 | 0.940 |
| 1981 | 1 | -- | 283 | 0.145 | 2.147 | 1140 | 1470 | 0.145 |
| 1982 | 1 | -- | 283 | 0.146 | 0.347 | 766 | 1030 | 0.373 |
| 1983 | 1 | -- | 283 | 0.148 | 2.607 | 2060 | 2550 | 0.023 |
| 1984 | 1 | -- | 283 | 0.150 | 0.799 | 765 | 1020 | 0.376 |
| 1985 | 1 | -- | 283 | 0.152 | 1.578 | 1290 | 1650 | 0.098 |
| 1986 | 1 | -- | 283 | 0.154 | 0.914 | 797 | 1060 | 0.351 |
| 1987 | 1 | -- | 283 | 0.156 | 2.117 | 973 | 1250 | 0.223 |
| 1988 | 1 | -- | 283 | 0.157 | 1.042 | 432 | 611 | 0.758 |
| 1989 | 1 | -- | 283 | 0.159 | 1.012 | 188 | 304 | 0.953 |
| 1990 | 1 | -- | 283 | 0.161 | 1.634 | 544 | 743 | 0.632 |
| 1991 | 1 | -- | 283 | 0.167 | 0.845 | 1360 | 1710 | 0.087 |
| 1992 | 1 | E | 283 | 0.173 | 0.507 | 172 | 275 | 0.962 |
| 1993 | 1 | -- | 283 | 0.179 | 0.786 | 724 | 946 | 0.438 |
| 1994 | 1 | -- | 283 | 0.185 | 0.752 | 1070 | 1340 | 0.188 |
| 1995 | 1 | -- | 283 | 0.191 | 1.222 | 516 | 686 | 0.686 |
| 1996 | 1 | -- | 283 | 0.197 | 2.730 | 5510 | 6410 | 0.000 |
| 1997 | 1 | -- | 283 | 0.203 | 2.484 | 2040 | 2430 | 0.028 |
| 1998 | 1 | -- | 283 | 0.209 | 1.010 | 507 | 663 | 0.709 |
| 1999 | 1 | C | 283 | 0.215 | 1.143 | 959 | 1180 | 0.269 |
| 2000 | 1 | CE | 283 | 0.221 | 1.538 | 297 | 410 | 0.908 |
| 2001 | 1 | C | 283 | 0.242 | 0.650 | 609 | 755 | 0.621 |
| 2002 | 1 | C | 438 | 0.262 | 1.543 | 562 | 686 | 0.687 |
| 2003 | 1 | C | 438 | 0.282 | 0.990 | 313 | 394 | 0.917 |
| 2004 | 1 | C | 438 | 0.302 | 1.975 | 1130 | 1270 | 0.217 |
| 2005 | 1 | C | 438 | 0.323 | 0.781 | 403 | 468 | 0.871 |
| 2006 | 1 | CE | 633 | 0.343 | 0.911 | 164 | 194 | 0.985 |
| 2007 | 1 | C | 633 | 0.363 | 0.553 | 1070 | 1140 | 0.292 |
| 2008 | 1 | C | 1114 | 0.383 | 3.710 | 2130 | 2200 | 0.039 |
| 2009 | 1 | C | 1114 | 0.403 | 0.911 | 1270 | 1290 | 0.205 |