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 Illinois, including Ford, Grundy, Iroquois, Kankakee, LaSalle, Livingston, and eastern and southern Will Counties. Portions of northwestern Indiana, including Lake, Porter, Newton, Jasper, and Benton counties. * WHEN...Through Saturday morning. * IMPACTS...Widespread flooding of low-lying including ditches and farm fields may occur. Widespread roadway flooding may occur. Area creeks and rivers may rapidly rise out of their banks. Some structures may flood. Some of the flooding may significant and locally life threatening. * ADDITIONAL DETAILS... - Repeated rounds of torrential rainfall producing thunderstorms in the past week have lead to widespread saturated soils and standing water in low-lying areas. Another round of torrential rainfall producing thunderstorms are expected tonight which may lead to widespread flash flooding. - http://www.weather.gov/safety/flood

Grand Calumet River At Industrial Hwy At Gary, In Historical Data

Historical Data


Streamflow Range


Date Average 2026 2025 2024 2023 2022 2021 2020 2019 2016 2015 2014 2013 2012 2011
01-01 414.3
01-02 420.6
01-03 416.3
01-04 415.0
01-05 406.6
01-06 408.4
01-07 430.33
01-08 448.78
01-09 466.0
01-10 409.7
01-11 428.8
01-12 416.6
01-13 402.09
01-14 399.3
01-15 409.2
01-16 410.2
01-17 402.89
01-18 410.9
01-19 398.73
01-20 399.0
01-21 389.73
01-22 386.2
01-23 395.33
01-24 403.82
01-25 410.2
01-26 454.7
01-27 402.27
01-28 392.73
01-29 398.64
01-30 402.73
01-31 454.8
02-01 402.45
02-02 392.5
02-03 401.09
02-04 400.0
02-05 405.27
02-06 409.27
02-07 380.18
02-08 414.1
02-09 412.27
02-10 409.36
02-11 418.3
02-12 417.0
02-13 397.82
02-14 410.67
02-15 398.27
02-16 440.73
02-17 405.27
02-18 416.5
02-19 418.0
02-20 410.75
02-21 412.17
02-22 400.18
02-23 403.67
02-24 417.8
02-25 415.7
02-26 419.33
02-27 415.55
02-28 415.36
02-29 394.0
03-01 401.36
03-02 415.08
03-03 416.45
03-04 416.25
03-05 423.58
03-06 409.91
03-07 425.0
03-08 412.0
03-09 405.75
03-10 408.08
03-11 425.09
03-12 418.73
03-13 410.7
03-14 411.5
03-15 440.7
03-16 431.4
03-17 422.1
03-18 429.3
03-19 450.91
03-20 416.4
03-21 416.0
03-22 404.0
03-23 417.36
03-24 427.18
03-25 416.18
03-26 451.0
03-27 432.0
03-28 424.18
03-29 420.82
03-30 405.4
03-31 402.4
04-01 436.4
04-02 444.7
04-03 418.5
04-04 430.1
04-05 439.7
04-06 426.3
04-07 446.1
04-08 445.0
04-09 402.5
04-10 415.9
04-11 429.3
04-12 462.89
04-13 447.89
04-14 432.89
04-15 430.78
04-16 447.56
04-17 437.0
04-18 451.0
04-19 425.78
04-20 448.22
04-21 442.0
04-22 446.78
04-23 454.33
04-24 442.22
04-25 437.67
04-26 473.0
04-27 448.56
04-28 456.11
04-29 470.33
04-30 496.78
05-01 481.0
05-02 426.78
05-03 464.22
05-04 462.11
05-05 475.78
05-06 461.67
05-07 459.44
05-08 451.44
05-09 483.78
05-10 465.22
05-11 478.33
05-12 470.25
05-13 457.88
05-14 453.29
05-15 521.67
05-16 459.17
05-17 508.5
05-18 508.57
05-19 452.0
05-20 511.17
05-21 479.14
05-22 459.57
05-23 469.0
05-24 514.0
05-25 493.43
05-26 491.0
05-27 468.29
05-28 449.29
05-29 511.71
05-30 450.29
05-31 469.71
06-01 439.57
06-02 460.71
06-03 442.14
06-04 426.0
06-05 451.17
06-06 476.0
06-07 478.57
06-08 497.63
06-09 520.29
06-10 499.43
06-11 491.14
06-12 486.43
06-13 483.29
06-14 519.14
06-15 484.14
06-16 494.0
06-17 480.0
06-18 484.57
06-19 500.71
06-20 503.29
06-21 572.43
06-22 586.43
06-23 519.14
06-24 547.43
06-25 560.43
06-26 578.86
06-27 649.14
06-28 574.43
06-29 614.71
06-30 616.43
07-01 565.57
07-02 565.57
07-03 590.57
07-04 639.25
07-05 636.38
07-06 652.75
07-07 592.13
07-08 626.0
07-09 652.75
07-10 592.88
07-11 655.88
07-12 697.38
07-13 624.88
07-14 618.75
07-15 623.13
07-16 679.25
07-17 620.88
07-18 617.0
07-19 608.63
07-20 635.13
07-21 624.25
07-22 622.13
07-23 600.63
07-24 624.5
07-25 631.5
07-26 637.5
07-27 613.0
07-28 637.63
07-29 631.25
07-30 616.63
07-31 658.38
08-01 695.83
08-02 710.0
08-03 606.0
08-04 620.56
08-05 622.0
08-06 618.11
08-07 596.33
08-08 597.11
08-09 600.33
08-10 589.78
08-11 587.78
08-12 630.89
08-13 592.88
08-14 618.11
08-15 590.13
08-16 583.14
08-17 590.71
08-18 587.86
08-19 654.38
08-20 598.0
08-21 588.25
08-22 594.0
08-23 579.63
08-24 583.88
08-25 600.0
08-26 583.0
08-27 584.67
08-28 563.89
08-29 565.67
08-30 571.11
08-31 548.13
09-01 560.63
09-02 548.75
09-03 509.29
09-04 515.13
09-05 531.75
09-06 509.0
09-07 518.13
09-08 541.38
09-09 534.75
09-10 513.11
09-11 537.22
09-12 543.0
09-13 512.22
09-14 508.67
09-15 498.11
09-16 490.88
09-17 473.71
09-18 535.75
09-19 487.25
09-20 488.13
09-21 499.78
09-22 504.33
09-23 487.11
09-24 482.22
09-25 479.0
09-26 462.63
09-27 467.38
09-28 518.22
09-29 469.75
09-30 470.29
10-01 469.5
10-02 461.63
10-03 485.25
10-04 505.67
10-05 479.11
10-06 458.5
10-07 450.13
10-08 456.75
10-09 465.78
10-10 476.0
10-11 472.89
10-12 471.78
10-13 443.33
10-14 461.89
10-15 484.57
10-16 451.0
10-17 447.56
10-18 455.44
10-19 433.88
10-20 459.2
10-21 434.9
10-22 465.4
10-23 429.4
10-24 451.1
10-25 505.1
10-26 481.4
10-27 478.7
10-28 445.44
10-29 460.8
10-30 482.56
10-31 461.5
11-01 463.45
11-02 443.45
11-03 428.73
11-04 433.36
11-05 418.9
11-06 416.22
11-07 424.22
11-08 417.56
11-09 439.56
11-10 432.33
11-11 407.67
11-12 415.67
11-13 418.11
11-14 412.1
11-15 430.9
11-16 391.1
11-17 402.9
11-18 415.9
11-19 418.9
11-20 404.44
11-21 422.8
11-22 446.0
11-23 423.9
11-24 407.73
11-25 418.0
11-26 412.5
11-27 410.0
11-28 392.44
11-29 398.44
11-30 422.0
12-01 397.0
12-02 396.63
12-03 388.6
12-04 397.8
12-05 421.0
12-06 400.4
12-07 393.1
12-08 393.8
12-09 397.9
12-10 396.0
12-11 403.2
12-12 433.6
12-13 425.6
12-14 388.2
12-15 411.7
12-16 400.56
12-17 389.56
12-18 402.8
12-19 405.2
12-20 391.6
12-21 405.3
12-22 399.8
12-23 412.9
12-24 400.6
12-25 399.4
12-26 400.4
12-27 411.6
12-28 397.1
12-29 412.4
12-30 438.3
12-31 391.0

Annual Peak Streamflow


Seasonal Comparison


Oceanic Nino Index