153000' - This flow is approximately where CLKM7 goes to "open river" conditions.
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.
35' - Near this height, the lock wall at Lock 24 is inundated.
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, a riverside community of 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.