20' - Water reaches the top of the levees near the river in Munster and Hammond.
19.5' - Without flood protection, widespread inundation of roadways and structures in the floodplain reaches up to 5 blocks from the river in Hammond and Munster.
19' - Water reaches isolated low spots in the levee in western sections of Hammond and Munster.
18.5' - Evacuations may begin near the river in Hammond and Munster. Without flood protection, I-80 is threatened at Calumet Avenue in Hammond.
17.5' - Residences threatened north of the river between Hohman Avenue and Lyman Avenue in Hammond. Water reaches the top of the levee in Calumet City and Lansing. Calumet Avenue may be closed at the levee in Hammond and Munster to install temporary flood protection. Hohman Avenue is threatened north of the river in Hammond.
16.5' - Without flood protection, widespread inundation of roadways and structures reaches up to 5 blocks from the river in Calumet City and Lansing.
15.5' - Columbia Avenue may be closed at the levee in Hammond and Munster to install temporary flood protection.
12.5' - Most areas outside of the levee-protected area are inundated in Hammond and Munster.
10' - Water overflows low-lying river banks outside of the levee-protected area in Hammond and Munster.