Missouri River at St. Charles

The past week

What floods at each level

• 42.2 ft

  This is the approximate minimum level of protection provided by the Monarch levee protecting Chesterfield Valley. Since this gage is affected by Mississippi River backwater, the actual level of overtopping may be higher.

• 38 ft

  Floor of the gage house.

• 37 ft

  Residences north of St. Charles become cut off near this height.

• 36 ft

  Major flooding begins. The levee at the Highway 370 bridge is overtopped.

• 35 ft

  The levee at the Highway 370 bridge overtops near this height. Missouri State Route F northwest of Defiance along Femme Osage Creek will be closed near this height.

• 34.5 ft

  Missouri Highway 94 near Route H will be closed in both directions near this height.

• 33 ft

  Up to 7 non-Federal levees are overtopped. (USACE)

• 32.5 ft

  The west end of Greens Bottom Road floods. This road connects Pittman Hill Road and Jungs Station Road south of 94.

• 32 ft

  Near this height, Missouri Bottom Road begins flooding between Prouhet Farm Road and Aubuchon Road.

• 30.7 ft

  Near this height, the base of the Lewis and Clark Boat House will begin flooding.

• 28 ft

  Near this height, Aubuchon Road and Charbonier Road begin flooding between Teson Road and Riverwood Estates Boulevard.

• 27 ft

  The Katy Trail begins flooding near this height along Hawning Road, about 2 miles north northeast of the Highway 370 bridge.

• 25 ft

  Downstream near this stage, Missouri Route H at Island Road and agricultural bottomland may begin flooding, depending on Mississippi River flow and backwater.

• 21 ft

  An access road to farmland on Bonhomme Island gets cut off above this height.

Highest crests on record

When the water runs low

• 7.0 feet

  The City of St. Louis Water Plant at Howard Bend is on alert for potential operational issues with low water.

• 4.0 - 4.5

  The first of two treatment train intakes at the Missouri American Water North plant may need to be shut down as water drops below the top of these intakes.

• 4.0 feet

  The City of St. Louis Water Plant at Howard Bend begins monitoring the potential loss of suction prime on the water pumps.

• 2.0 - 3.2

  The Missouri American Water Central Plant begins monitoring a developing vortex in the intake pool to ensure adequate intake volume.

• 1.0 feet

  The Missouri American Water North Plant may need to shut down the last treatment train as water drops below the top of the these intakes.

• 0 - 1 ft.

  The Missouri American Water Central Plant may need to shut down as water levels fall below the top of these intakes.

• -1.0 ft.

  At the City of St. Louis Water Plant at Howard Bend, critical shutdown is possible with additional pumps needed to avoid shutdown as water drops below the top of these intakes.

More on Missouri River