Observed and urbanization-adjusted annual maximum peak discharge and associated urban fraction and precipitation values at USGS streamgage:
05528000 DES PLAINES RIVER NEAR GURNEE, 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 |
| 1946 | 1 | -- | 1266 | 0.043 | 0.683 | 1580 | 2160 | 0.326 |
| 1947 | 1 | -- | 1266 | 0.045 | 1.178 | 931 | 1350 | 0.679 |
| 1948 | 1 | -- | 1266 | 0.047 | 1.802 | 2620 | 3420 | 0.086 |
| 1949 | 1 | 2 | 1266 | 0.050 | 0.315 | 1300 | 1810 | 0.460 |
| 1950 | 1 | -- | 1266 | 0.052 | 1.502 | 1780 | 2370 | 0.257 |
| 1951 | 1 | -- | 1266 | 0.055 | 0.162 | 1600 | 2160 | 0.326 |
| 1952 | 1 | -- | 1266 | 0.059 | 0.950 | 1830 | 2410 | 0.244 |
| 1953 | 1 | -- | 1266 | 0.062 | 0.399 | 391 | 639 | 0.939 |
| 1954 | 1 | -- | 1266 | 0.066 | 1.436 | 960 | 1350 | 0.676 |
| 1955 | 1 | -- | 1266 | 0.070 | 0.100 | 1100 | 1520 | 0.602 |
| 1956 | 1 | -- | 1266 | 0.073 | 1.011 | 420 | 669 | 0.933 |
| 1957 | 1 | -- | 1636 | 0.077 | 0.725 | 745 | 1070 | 0.801 |
| 1958 | 1 | -- | 1636 | 0.080 | 0.168 | 845 | 1190 | 0.753 |
| 1960 | 1 | -- | 1805 | 0.087 | 0.079 | 3070 | 3840 | 0.061 |
| 1961 | 1 | -- | 1805 | 0.090 | 0.425 | 960 | 1320 | 0.694 |
| 1962 | 1 | -- | 1805 | 0.094 | 0.161 | 2140 | 2700 | 0.179 |
| 1963 | 1 | -- | 1805 | 0.097 | 1.479 | 190 | 322 | 0.988 |
| 1964 | 1 | 4B | 2022 | 0.100 | 0.017 | 700 | 990 | 0.834 |
| 1965 | 1 | -- | 2022 | 0.103 | 0.541 | 1520 | 1970 | 0.391 |
| 1966 | 1 | -- | 2022 | 0.107 | 0.515 | 1580 | 2040 | 0.368 |
| 1967 | 1 | -- | 2022 | 0.110 | 1.443 | 1520 | 1960 | 0.396 |
| 1968 | 1 | -- | 2022 | 0.113 | 0.488 | 394 | 598 | 0.948 |
| 1969 | 1 | -- | 2022 | 0.116 | 1.323 | 980 | 1300 | 0.700 |
| 1970 | 1 | -- | 2022 | 0.119 | 1.705 | 1160 | 1510 | 0.605 |
| 1971 | 1 | 2 | 2022 | 0.124 | 0.242 | 1610 | 2040 | 0.368 |
| 1972 | 1 | -- | 2922 | 0.128 | 0.595 | 1750 | 2180 | 0.316 |
| 1973 | 1 | -- | 2922 | 0.133 | 1.411 | 1500 | 1890 | 0.423 |
| 1974 | 1 | -- | 2922 | 0.137 | 0.480 | 2140 | 2600 | 0.196 |
| 1975 | 1 | -- | 2922 | 0.141 | 0.899 | 661 | 895 | 0.870 |
| 1976 | 1 | -- | 2922 | 0.146 | 1.345 | 2590 | 3110 | 0.120 |
| 1977 | 1 | -- | 2922 | 0.150 | 0.816 | 173 | 269 | 1.000 |
| 1978 | 1 | -- | 2922 | 0.154 | 0.259 | 1700 | 2080 | 0.353 |
| 1979 | 1 | -- | 2922 | 0.159 | 0.295 | 2860 | 3380 | 0.089 |
| 1980 | 1 | -- | 2922 | 0.163 | 0.307 | 955 | 1210 | 0.745 |
| 1981 | 1 | -- | 2922 | 0.166 | 0.172 | 651 | 855 | 0.883 |
| 1982 | 1 | -- | 2922 | 0.169 | 0.496 | 1590 | 1930 | 0.409 |
| 1983 | 1 | -- | 2922 | 0.172 | 0.512 | 2370 | 2780 | 0.168 |
| 1984 | 1 | -- | 2922 | 0.176 | 0.200 | 1050 | 1300 | 0.703 |
| 1985 | 1 | -- | 2922 | 0.179 | 1.053 | 1800 | 2140 | 0.331 |
| 1986 | 1 | -- | 2922 | 0.182 | 1.127 | 3530 | 4060 | 0.051 |
| 1987 | 1 | -- | 2922 | 0.185 | 0.017 | 1260 | 1520 | 0.601 |
| 1988 | 1 | -- | 2922 | 0.188 | 0.173 | 1390 | 1660 | 0.526 |
| 1989 | 1 | -- | 2922 | 0.191 | 0.443 | 279 | 384 | 0.982 |
| 1990 | 1 | -- | 2922 | 0.194 | 0.287 | 1400 | 1660 | 0.526 |
| 1991 | 1 | -- | 2922 | 0.200 | 0.256 | 1260 | 1500 | 0.611 |
| 1992 | 1 | -- | 2922 | 0.207 | 0.070 | 820 | 998 | 0.831 |
| 1993 | 1 | -- | 2922 | 0.213 | 0.898 | 2370 | 2680 | 0.184 |
| 1994 | 1 | -- | 2922 | 0.219 | 0.768 | 1370 | 1590 | 0.565 |
| 1995 | 1 | C | 2922 | 0.225 | 0.106 | 1220 | 1410 | 0.649 |
| 1996 | 1 | C | 2922 | 0.231 | 0.963 | 1640 | 1860 | 0.437 |
| 1997 | 1 | C | 2922 | 0.237 | 1.664 | 1320 | 1500 | 0.609 |
| 1998 | 1 | C | 2922 | 0.243 | 0.732 | 1180 | 1340 | 0.683 |
| 1999 | 1 | C | 2922 | 0.249 | 1.142 | 1470 | 1640 | 0.537 |
| 2000 | 1 | CE | 2922 | 0.255 | 0.925 | 2690 | 2920 | 0.147 |
| 2001 | 1 | C | 2922 | 0.264 | 0.122 | 1140 | 1260 | 0.719 |
| 2002 | 1 | C | 2922 | 0.273 | 0.881 | 989 | 1090 | 0.794 |
| 2003 | 1 | CE | 2922 | 0.283 | 0.483 | 516 | 579 | 0.951 |
| 2004 | 1 | C | 2922 | 0.292 | 1.601 | 3890 | 4070 | 0.050 |
| 2005 | 1 | C | 2922 | 0.301 | 0.284 | 1090 | 1160 | 0.766 |
| 2006 | 1 | C | 2922 | 0.310 | 0.090 | 838 | 885 | 0.874 |
| 2007 | 1 | C | 2922 | 0.319 | 0.807 | 2390 | 2450 | 0.234 |
| 2008 | 1 | C | 2922 | 0.328 | 0.888 | 1900 | 1940 | 0.405 |
| 2009 | 1 | C | 2922 | 0.337 | 1.919 | 2120 | 2140 | 0.329 |