29.5

The boat house floods.

28.6

The floodwall at the sewage treatment plant is overtopped, forcing the plant shutdown.

28.4

This is the RECORD FLOOD LEVEL that was reached on July 28 1993.

28.3

This represents the height of the railroad tracks along Water Street.

28

Water reaches low steel on railroad bridge in Louisiana.

27

The Sny Island Cell #2 Levee is overtopped. This flood level was reached on April 24 1973.

26

Floodgates and sandbags are used to protect the city water treatment intake.

25.5

The south end of Main Street in Louisiana begins flooding.

25.25

Missouri Highway 79 from County Road 115 to County Road 117 is closed northwest of Louisiana.

23.9

US Route 54 to Louisiana Missouri is closed on the Illinois side of the bridge.

23.5

Sny Levee District starts mobilizing to close levee.

23.4

The east approach to the Highway 54 bridge in Illinois begins to flood.

23

Numerous houses and businesses in southeast Louisiana begin to flood.

22.8

Highway 79 is closed at Route D south of Louisiana near the Dyno-Nobel plant and Calumet plant.

21.7

Floodgates are installed at the city sewage treatment facility.

21.5

Water encroaches both shoulders of State Highway 79 about one half mile south of Louisiana at the Junction of County Road D. Also at this level low sections highway 79 in Louisiana are flooded. Motorists are detoured onto side streets. A business at the SW corner of Highway 79 and Alabama begins flooding.

21.3

Highway 79 near Alabama Street at Gladney's car lot is closed.

21

Highway 79 begins flooding near 3rd Street on the south side of Louisiana.

20.8

Near this height, the railroad bridge below the mouth of Noix Creek is closed.

20.2

Maryland Street at 4th Street and Illinois Street between Main and Highway 79 begin flooding.

20

Highway 79 starts flooding at Delaware Street and Alabama Street.

17

The parking area at the boat house floods.

15

Damage begins in unprotected areas.

12.2

For barge navigation, the Corps will attempt to keep the river at or below this level. Year-round target levels are between 11.5 and 12.2 feet.

11.5

For safe navigation of barge traffic, the Corps will try to keep the river above this level. Year-round target levels are between 11.5 and 12.2 feet.

https://water.weather.gov/ahps2/hydrograph.php?wfo=lsx&gage=lusm7

38.1

Sny Island Cell #4 levee is overtopped.

37.1

Sny Island Cell #3 levee is overtopped.

36.25

Highway 79 is closed from one mile south of Annada to two miles north of Annada. Route H is closed from Annada to about one mile west of Annada.

36

Near this height, the top of the sewage treatment lagoon just south of town is overtopped.

34

Route W (Kentucky Street) is closed for one block between Third Street and Highway 79. Also, near this height, the living areas of homes in the Port Marmac area begin flooding.

33

Clarksville city businesses from 1st Street to 3rd Street begin to flood.

32.79

IL route 96 from near Mozier to County Road 2 inundated and closed near this height.

32.5

Near this level, the lock is closed to navigation.

32.29

Route N is closed between Route D and Highway 79.

32

Front Street begins to flood.

31.5

Burlington Northern SF railroad tracks begin to flood. Also, Highway 79 is closed about a mile south of Clarksville.

31

The Clarksville Boat Club, south of Lock & Dam 24, begins to flood. First Street begins flooding. A sand-filled barrier at the bottom of Howard Street is considered. In Hamburg, Illinois, Water Street floods.

30.8

Near this height, Highway 79 is closed from Route N to about a mile northwest of that intersection.

30

East bank (Illinois side) begins to flood.

29

Water enters the parking lot entrance at the Clarksville Riverfront Park.

27.2

Silo Park just northwest of Clarksville off Highway 79 begins flooding.

25.5

State Route P east of Elsberry begins flooding just east of the levee.

25.3

The road to Port Marmac, about 15 homes just south of Clarksville, begins flooding.

23.5

Flooding begins in unprotected areas.

23

At this approximate stage, the Corps will take gates out of the river, creating "open river" conditions. This corresponds to an approximate stage of 155,000 cfs.