Observed and urbanization-adjusted annual maximum peak discharge and associated urban fraction and precipitation values at USGS streamgage:
05440500 KILLBUCK CREEK NEAR MONROE CENTER, 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 |
| 1940 | 1 | 2 | 0 | 0.008 | 0.687 | 640 | 656 | 0.945 |
| 1941 | 1 | -- | 0 | 0.008 | 0.583 | 2360 | 2400 | 0.463 |
| 1942 | 1 | -- | 0 | 0.008 | 0.615 | 1100 | 1120 | 0.852 |
| 1943 | 1 | -- | 0 | 0.008 | 1.081 | 3450 | 3490 | 0.222 |
| 1944 | 1 | -- | 0 | 0.008 | 1.605 | 2370 | 2410 | 0.460 |
| 1945 | 1 | -- | 0 | 0.008 | 1.264 | 2520 | 2560 | 0.417 |
| 1946 | 1 | -- | 0 | 0.008 | 0.654 | 4750 | 4810 | 0.090 |
| 1947 | 1 | -- | 0 | 0.008 | 1.359 | 795 | 813 | 0.921 |
| 1948 | 1 | -- | 0 | 0.008 | 1.807 | 4390 | 4440 | 0.117 |
| 1949 | 1 | -- | 0 | 0.008 | 0.289 | 2620 | 2660 | 0.391 |
| 1950 | 1 | -- | 0 | 0.008 | 0.015 | 2820 | 2860 | 0.346 |
| 1951 | 1 | D | 0 | 0.008 | 3.338 | 6100 | 6170 | 0.045 |
| 1952 | 1 | -- | 0 | 0.008 | 2.568 | 4030 | 4080 | 0.152 |
| 1953 | 1 | E | 0 | 0.009 | 0.342 | 770 | 787 | 0.926 |
| 1954 | 1 | E | 0 | 0.009 | 1.738 | 620 | 634 | 0.949 |
| 1955 | 1 | -- | 0 | 0.009 | 4.727 | 6100 | 6160 | 0.045 |
| 1956 | 1 | -- | 0 | 0.009 | 0.667 | 3050 | 3090 | 0.298 |
| 1957 | 1 | -- | 0 | 0.009 | 0.352 | 1450 | 1470 | 0.759 |
| 1958 | 1 | -- | 0 | 0.010 | 1.710 | 2490 | 2520 | 0.427 |
| 1959 | 1 | 2 | 0 | 0.010 | 0.352 | 3610 | 3650 | 0.197 |
| 1960 | 1 | -- | 0 | 0.010 | 0.705 | 2630 | 2660 | 0.390 |
| 1961 | 1 | E | 0 | 0.010 | 0.999 | 267 | 274 | 1.000 |
| 1962 | 1 | -- | 0 | 0.010 | 0.471 | 3370 | 3410 | 0.238 |
| 1963 | 1 | E | 0 | 0.011 | 0.147 | 978 | 994 | 0.884 |
| 1964 | 1 | E | 0 | 0.011 | 1.089 | 298 | 305 | 0.989 |
| 1965 | 1 | 2 | 0 | 0.011 | 0.045 | 1800 | 1820 | 0.649 |
| 1966 | 1 | E | 0 | 0.011 | 0.699 | 4040 | 4080 | 0.152 |
| 1967 | 1 | E | 0 | 0.011 | 1.113 | 612 | 623 | 0.951 |
| 1968 | 1 | E | 0 | 0.011 | 1.138 | 1650 | 1670 | 0.697 |
| 1969 | 1 | -- | 0 | 0.012 | 0.152 | 3550 | 3580 | 0.207 |
| 1970 | 1 | -- | 0 | 0.012 | 1.864 | 1870 | 1890 | 0.629 |
| 1971 | 1 | -- | 0 | 0.012 | 0.465 | 3720 | 3750 | 0.186 |
| 1972 | 1 | -- | 0 | 0.013 | 1.565 | 4700 | 4740 | 0.094 |
| 1973 | 1 | -- | 0 | 0.013 | 2.299 | 5570 | 5610 | 0.059 |
| 1974 | 1 | -- | 0 | 0.013 | 1.738 | 5400 | 5440 | 0.065 |
| 1975 | 1 | -- | 0 | 0.014 | 0.008 | 3200 | 3220 | 0.272 |
| 1976 | 1 | -- | 0 | 0.014 | 1.435 | 2670 | 2690 | 0.383 |
| 1977 | 1 | -- | 0 | 0.015 | 0.691 | 1330 | 1340 | 0.794 |
| 1978 | 1 | -- | 0 | 0.015 | 1.187 | 3190 | 3210 | 0.274 |
| 1979 | 1 | -- | 0 | 0.016 | 0.402 | 3900 | 3920 | 0.168 |
| 1980 | 1 | -- | 0 | 0.016 | 1.118 | 2830 | 2850 | 0.349 |