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Flood Warning — Piatt County, IL, Cass County, IL, Mason County, IL
Flood Warning
Issued
Expires
7:00 AM CDT · Thu, Jun 25 2026
Issuing Office
NWS KILX

Affected Areas

Piatt County, IL Cass County, IL Mason County, IL

Official Bulletin

244
WGUS83 KILX 220214 RRA
FLSILX

Flood Statement
National Weather Service Lincoln IL
914 PM CDT Sun Jun 21 2026

...The Flood Warning continues for the following rivers in
Illinois...

  Sangamon River at Monticello affecting Piatt County.

  Sangamon River near Chandlerville affecting Mason and Cass
  Counties.

.The following forecasts are based on observed precipitation, soil
moisture conditions, and forecast precipitation.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Persons with interests along this river need to remain aware of the
latest forecasts and associated flood risk for their area. Stay
tuned for further updates on this flooding situation.

Additional information is available at www.weather.gov.

&&

ILC147-221815-
/O.EXT.KILX.FL.W.0024.000000T0000Z-260625T1200Z/
/MNTI2.1.ER.260618T1400Z.260621T2245Z.260625T0600Z.NO/
914 PM CDT Sun Jun 21 2026

...FLOOD WARNING NOW IN EFFECT UNTIL THURSDAY MORNING...

* WHAT...Minor flooding is occurring and minor flooding is forecast.

* WHERE...Sangamon River at Monticello.

* WHEN...Until Thursday morning.

* IMPACTS...At 13.0 feet, Flooding of agricultural areas begins.

* ADDITIONAL DETAILS...
  - At 9:00 PM CDT Sunday the stage was 14.7 feet.
  - Recent Activity...The maximum river stage in the 24 hours
    ending at 9:00 PM CDT Sunday was 14.7 feet.
  - Forecast...The river is expected to rise to a crest of 14.7
    feet just after midnight tonight. It will then fall below
    flood stage early Thursday morning.
  - Flood stage is 13.0 feet.
  - http://www.weather.gov/safety/flood

&&

              Fld   Observed           Forecasts (7 pm CDT)
Location      Stg   Stg   Day/Time     Mon   Tue   Wed

Sangamon River
Monticello    13.0  14.7  Sun 9 pm CDT 14.4  13.9  13.2

&&

LAT...LON 4019 8847 4008 8847 4001 8854 3990 8874
      4000 8874 4006 8861

$$

ILC017-125-221815-
/O.EXT.KILX.FL.W.0028.260623T1500Z-260625T2100Z/
/CDLI2.1.ER.260623T1500Z.260624T0600Z.260625T1500Z.NO/
914 PM CDT Sun Jun 21 2026

...FLOOD WARNING NOW IN EFFECT FROM TUESDAY MORNING TO THURSDAY
AFTERNOON...

* WHAT...Minor flooding is forecast.

* WHERE...Sangamon River near Chandlerville.

* WHEN...From Tuesday morning to Thursday afternoon.

* ADDITIONAL DETAILS...
  - At 9:00 PM CDT Sunday the stage was 454.8 feet.
  - Forecast...The river is expected to rise above flood stage
    late Tuesday morning to a crest of 457.1 feet early Wednesday
    morning. It will then fall below flood stage late Thursday
    morning.
  - Flood stage is 456.6 feet.
  - http://www.weather.gov/safety/flood

&&

              Fld   Observed           Forecasts (7 pm CDT)
Location      Stg   Stg   Day/Time     Mon   Tue   Wed

Sangamon River
Chandlerville 456.6 454.8 Sun 9 pm CDT 455.5 457.0 457.0

&&

LAT...LON 4013 9007 4006 9002 4002 9016 4003 9043
      4010 9036 4010 9017

$$

MJA