Observed and urbanization-adjusted annual maximum peak discharge and associated urban fraction and precipitation values at USGS streamgage:
05534500 NORTH BRANCH CHICAGO RIVER AT DEERFIELD, 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 | 0.144 | 0.742 | 79 | 252 | 0.932 |
| 1954 | 1 | -- | 0 | 0.159 | 1.524 | 247 | 522 | 0.441 |
| 1955 | 1 | -- | 0 | 0.174 | 1.014 | 247 | 515 | 0.453 |
| 1956 | 1 | E | 0 | 0.189 | 1.243 | 207 | 442 | 0.602 |
| 1957 | 1 | -- | 0 | 0.203 | 1.069 | 284 | 559 | 0.375 |
| 1958 | 1 | E | 0 | 0.218 | 0.157 | 178 | 387 | 0.714 |
| 1959 | 1 | -- | 0 | 0.233 | 1.527 | 292 | 557 | 0.377 |
| 1960 | 1 | -- | 0 | 0.248 | 0.450 | 284 | 539 | 0.409 |
| 1961 | 1 | -- | 0 | 0.260 | 1.016 | 178 | 374 | 0.743 |
| 1962 | 1 | -- | 0 | 0.272 | 0.226 | 268 | 504 | 0.474 |
| 1963 | 1 | E | 0 | 0.284 | 1.313 | 134 | 302 | 0.869 |
| 1964 | 1 | -- | 0 | 0.296 | 0.808 | 228 | 432 | 0.620 |
| 1965 | 1 | -- | 0 | 0.308 | 0.528 | 208 | 399 | 0.689 |
| 1966 | 1 | -- | 0 | 0.321 | 0.517 | 311 | 544 | 0.400 |
| 1967 | 1 | -- | 0 | 0.333 | 1.400 | 386 | 633 | 0.251 |
| 1968 | 1 | E | 0 | 0.345 | 0.652 | 173 | 338 | 0.807 |
| 1969 | 1 | -- | 0 | 0.357 | 2.197 | 359 | 589 | 0.320 |
| 1970 | 1 | D | 0 | 0.369 | 1.900 | 268 | 459 | 0.562 |
| 1971 | 1 | E | 0 | 0.379 | 0.341 | 341 | 557 | 0.377 |
| 1972 | 1 | -- | 0 | 0.389 | 2.651 | 368 | 585 | 0.326 |
| 1973 | 1 | -- | 0 | 0.399 | 1.303 | 390 | 607 | 0.289 |
| 1974 | 1 | -- | 0 | 0.409 | 1.298 | 362 | 569 | 0.355 |
| 1975 | 1 | 2 | 0 | 0.419 | 1.098 | 370 | 574 | 0.346 |
| 1976 | 1 | -- | 0 | 0.429 | 1.709 | 550 | 804 | 0.121 |
| 1977 | 1 | E | 0 | 0.439 | 1.090 | 58 | 139 | 1.000 |
| 1978 | 1 | -- | 0 | 0.449 | 1.668 | 292 | 457 | 0.566 |
| 1979 | 1 | -- | 0 | 0.459 | 1.284 | 358 | 541 | 0.407 |
| 1980 | 1 | -- | 0 | 0.469 | 0.671 | 237 | 379 | 0.732 |
| 1981 | 1 | -- | 0 | 0.478 | 0.827 | 348 | 518 | 0.448 |
| 1982 | 1 | -- | 0 | 0.488 | 2.726 | 756 | 1020 | 0.048 |
| 1983 | 1 | -- | 0 | 0.497 | 2.250 | 702 | 952 | 0.064 |
| 1984 | 1 | D | 0 | 0.507 | 0.347 | 415 | 585 | 0.325 |
| 1985 | 1 | -- | 0 | 0.516 | 0.683 | 678 | 908 | 0.074 |
| 1986 | 1 | -- | 0 | 0.526 | 1.450 | 465 | 632 | 0.251 |
| 1987 | 1 | -- | 0 | 0.535 | 3.505 | 933 | 1200 | 0.028 |
| 1988 | 1 | E | 0 | 0.545 | 0.713 | 273 | 393 | 0.704 |
| 1989 | 1 | E | 0 | 0.554 | 1.584 | 210 | 314 | 0.848 |
| 1990 | 1 | -- | 0 | 0.564 | 1.764 | 557 | 722 | 0.171 |
| 1991 | 1 | -- | 0 | 0.575 | 1.954 | 462 | 604 | 0.292 |
| 1992 | 0 | CE | 500 | 0.586 | 2.252 | 198 | 286 | 0.894 |
| 1993 | 2 | C | 500 | 0.597 | 1.332 | 469 | 585 | 0.323 |
| 1994 | 2 | C | 500 | 0.608 | 2.179 | 590 | 714 | 0.177 |
| 1995 | 2 | C | 500 | 0.619 | 1.544 | 561 | 673 | 0.206 |
| 1996 | 2 | C | 500 | 0.630 | 1.574 | 559 | 665 | 0.215 |
| 1997 | 2 | CE | 500 | 0.641 | 2.644 | 630 | 738 | 0.161 |
| 1998 | 2 | CE | 500 | 0.652 | 0.863 | 239 | 303 | 0.867 |
| 1999 | 2 | C | 500 | 0.663 | 1.683 | 590 | 679 | 0.201 |
| 2000 | 2 | C | 500 | 0.675 | 1.700 | 437 | 510 | 0.465 |
| 2001 | 2 | C | 500 | 0.688 | 2.854 | 537 | 608 | 0.284 |
| 2002 | 2 | C | 500 | 0.702 | 2.280 | 787 | 869 | 0.089 |
| 2003 | 2 | C | 500 | 0.716 | 0.702 | 309 | 352 | 0.782 |
| 2004 | 2 | C | 500 | 0.730 | 0.902 | 386 | 426 | 0.630 |
| 2005 | 2 | CE | 500 | 0.744 | 0.675 | 377 | 410 | 0.667 |
| 2006 | 2 | C | 500 | 0.758 | 0.789 | 356 | 382 | 0.726 |
| 2007 | 2 | C | 500 | 0.772 | 1.624 | 513 | 537 | 0.416 |
| 2008 | 2 | C | 500 | 0.786 | 3.436 | 749 | 768 | 0.143 |
| 2009 | 2 | C | 500 | 0.800 | 0.803 | 624 | 632 | 0.250 |