Chicago ? Standing water on Chicago-area expressways turned what should have been an easy Saturday morning drive into a soggy, snarled mess after heavy rains across the Midwest closed roads, stranded residents and punched a hole through an Iowa dam.

In Chicago, officials say more than 7 inches of rain fell early Saturday, inundating the sewer system and overwhelming waterways. Water covered portions of several Chicago interstates and the commuter train tracks that run along them, leading crews to divert traffic and call in bus shuttles. Portions of Interstate 290 west of downtown were closed for several hours.

Chicago Mayor Richard Daley and other officials urged residents to call for help if they need it.

In eastern Iowa, the Lake Delhi dam failed as rising floodwater from the Maquoketa River ate a 30-foot-wide hole in the earthen dam, causing water to drop 45 feet to the river below and threatening the small town of Hopkinton.

Areas below and above the dam had been evacuated after heavy rain has pushed the river to 23.92 feet — more than 2 feet above its previous record of 21.66 feet in 2004.