Overview Realtime Historical Map View
Flood Watch
2026-08-15T10:00:00-05:00

* WHAT...Flash flooding caused by excessive rainfall continues to be possible. * WHERE...Portions of north central and northeast Illinois including Lee, Ogle, DeKalb, Kane, Kendall, DuPage, Cook, and northern Will counties. * WHEN...Through Saturday morning. * IMPACTS...Creeks and streams may rise out of their banks. Flooding may occur in poor drainage and urban areas, especially in the vicinity of storm drains that are clogged by leaf debris. Underpasses and viaducts may flood in urban areas, as well. * ADDITIONAL DETAILS... - Another round of torrential rain-producing showers and storms is expected across the watch area tonight. Saturated soils and torrential downpours will set the stage for flash flooding. - http://www.weather.gov/safety/flood

Long Run Near Lemont, Il Historical Data

Historical Data


Streamflow Range


Date Average 2026 2025 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011
01-01 48.94
01-02 28.31
01-03 19.93
01-04 27.68
01-05 19.32
01-06 15.92
01-07 14.19
01-08 16.1
01-09 78.53
01-10 63.61
01-11 64.37
01-12 43.61
01-13 45.29
01-14 24.6
01-15 20.78
01-16 14.49
01-17 14.66
01-18 15.51
01-19 17.35
01-20 18.62
01-21 13.48
01-22 10.98
01-23 34.33
01-24 45.99
01-25 47.24
01-26 74.71
01-27 72.11
01-28 36.23
01-29 28.94
01-30 36.18
01-31 34.09
02-01 19.59
02-02 20.82
02-03 37.38
02-04 38.04
02-05 27.53
02-06 25.56
02-07 21.87
02-08 31.57
02-09 17.31
02-10 35.38
02-11 27.86
02-12 22.0
02-13 18.68
02-14 15.1
02-15 13.65
02-16 20.03
02-17 72.32
02-18 30.9
02-19 19.38
02-20 59.61
02-21 82.62
02-22 66.57
02-23 94.14
02-24 55.3
02-25 21.23
02-26 15.42
02-27 23.99
02-28 50.2
02-29 11.98
03-01 48.18
03-02 36.72
03-03 25.98
03-04 23.96
03-05 33.65
03-06 31.59
03-07 25.57
03-08 22.98
03-09 38.93
03-10 45.9
03-11 89.34
03-12 57.88
03-13 36.35
03-14 43.88
03-15 80.27
03-16 62.46
03-17 38.98
03-18 36.63
03-19 31.3
03-20 50.74
03-21 43.79
03-22 27.1
03-23 20.97
03-24 30.77
03-25 38.35
03-26 38.69
03-27 36.64
03-28 29.4
03-29 25.51
03-30 28.2
03-31 97.04
04-01 66.7
04-02 45.11
04-03 83.58
04-04 65.96
04-05 47.44
04-06 62.35
04-07 53.95
04-08 35.93
04-09 30.8
04-10 34.71
04-11 35.59
04-12 31.81
04-13 23.14
04-14 30.2
04-15 31.15
04-16 44.2
04-17 32.42
04-18 70.17
04-19 73.94
04-20 49.62
04-21 32.3
04-22 25.07
04-23 29.83
04-24 29.13
04-25 24.96
04-26 29.25
04-27 18.99
04-28 27.67
04-29 72.32
04-30 128.5
05-01 124.67
05-02 68.39
05-03 41.35
05-04 51.92
05-05 34.67
05-06 32.68
05-07 38.95
05-08 36.5
05-09 57.01
05-10 70.07
05-11 64.13
05-12 52.02
05-13 33.14
05-14 23.15
05-15 51.65
05-16 30.86
05-17 32.98
05-18 118.5
05-19 57.73
05-20 27.96
05-21 22.48
05-22 47.37
05-23 26.77
05-24 37.35
05-25 22.79
05-26 25.13
05-27 37.02
05-28 60.17
05-29 89.68
05-30 50.28
05-31 29.22
06-01 21.67
06-02 18.04
06-03 13.09
06-04 10.45
06-05 15.92
06-06 11.14
06-07 12.96
06-08 12.41
06-09 12.5
06-10 54.97
06-11 42.4
06-12 30.66
06-13 48.03
06-14 20.13
06-15 27.41
06-16 57.94
06-17 32.68
06-18 16.01
06-19 32.43
06-20 18.42
06-21 31.73
06-22 65.54
06-23 40.18
06-24 19.32
06-25 21.79
06-26 18.84
06-27 41.43
06-28 15.58
06-29 37.24
06-30 36.77
07-01 38.94
07-02 25.07
07-03 33.25
07-04 20.84
07-05 58.32
07-06 74.1
07-07 20.23
07-08 13.74
07-09 14.44
07-10 8.72
07-11 7.8
07-12 16.37
07-13 68.19
07-14 41.29
07-15 14.33
07-16 13.2
07-17 12.98
07-18 9.9
07-19 9.85
07-20 12.91
07-21 11.27
07-22 27.89
07-23 21.0
07-24 32.27
07-25 45.34
07-26 25.93
07-27 10.95
07-28 11.86
07-29 25.73
07-30 22.97
07-31 10.08
08-01 6.73
08-02 16.51
08-03 8.3
08-04 7.23
08-05 7.78
08-06 7.86
08-07 5.14
08-08 8.01
08-09 5.59
08-10 6.49
08-11 4.7
08-12 12.26
08-13 30.05
08-14 14.46
08-15 11.6
08-16 6.98
08-17 5.42
08-18 7.29
08-19 25.47
08-20 19.98
08-21 17.92
08-22 11.76
08-23 8.4
08-24 13.17
08-25 5.73
08-26 18.33
08-27 19.22
08-28 20.69
08-29 8.83
08-30 9.27
08-31 6.43
09-01 4.82
09-02 7.35
09-03 4.7
09-04 9.67
09-05 5.63
09-06 7.09
09-07 9.14
09-08 8.12
09-09 7.08
09-10 5.25
09-11 17.96
09-12 15.06
09-13 7.55
09-14 6.52
09-15 4.53
09-16 7.65
09-17 4.73
09-18 11.85
09-19 18.41
09-20 14.7
09-21 6.94
09-22 6.87
09-23 17.34
09-24 7.01
09-25 3.57
09-26 5.62
09-27 9.69
09-28 84.67
09-29 40.14
09-30 33.9
10-01 13.69
10-02 12.99
10-03 10.87
10-04 30.53
10-05 11.67
10-06 16.51
10-07 16.2
10-08 18.72
10-09 10.7
10-10 7.11
10-11 22.22
10-12 15.43
10-13 11.38
10-14 14.0
10-15 69.01
10-16 36.83
10-17 18.05
10-18 12.67
10-19 11.42
10-20 10.46
10-21 10.18
10-22 8.21
10-23 8.97
10-24 22.18
10-25 27.95
10-26 28.89
10-27 94.09
10-28 33.76
10-29 19.47
10-30 16.77
10-31 41.72
11-01 33.21
11-02 20.01
11-03 15.68
11-04 13.82
11-05 14.08
11-06 14.61
11-07 17.73
11-08 12.3
11-09 23.34
11-10 19.68
11-11 14.99
11-12 11.87
11-13 10.97
11-14 9.23
11-15 8.44
11-16 14.86
11-17 12.39
11-18 29.89
11-19 46.61
11-20 26.46
11-21 19.46
11-22 33.5
11-23 18.9
11-24 12.18
11-25 15.54
11-26 23.72
11-27 29.69
11-28 21.86
11-29 37.58
11-30 21.23
12-01 19.42
12-02 41.2
12-03 24.68
12-04 20.46
12-05 16.9
12-06 16.45
12-07 14.95
12-08 13.11
12-09 12.18
12-10 11.13
12-11 13.1
12-12 11.63
12-13 14.11
12-14 10.68
12-15 63.96
12-16 27.77
12-17 26.24
12-18 15.74
12-19 14.5
12-20 10.25
12-21 16.5
12-22 23.77
12-23 23.83
12-24 33.71
12-25 18.73
12-26 23.99
12-27 17.83
12-28 26.89
12-29 32.84
12-30 62.58
12-31 32.57

Annual Peak Streamflow


Seasonal Comparison


Oceanic Nino Index