INDIANAPOLIS | Flash floods that hit south-central Indiana left residents wondering how they were going clean up the mess, even as those farther south braced for new flooding brought by floodwaters rushing toward the Ohio River.

Rescuers in boats were still plucking people from rising waters Sunday in flooding that caused at least one death. As much as 11 inches of rain swamped the state Saturday, flooding homes, threatening dams and closing several roads and highways.

Saturday's flooding killed at least one person, a man who drowned in his vehicle in Bartholomew County about 50 miles south of Indianapolis, said John Erickson, a spokesman for the Indiana Department of Homeland Security.

Another person was reported missing after falling off a boat on Mill Creek near the town of Little Point about 30 miles southwest of Indianapolis.

Meanwhile, Gov. Mitch Daniels declared another 13 counties as disaster areas Sunday, boosting the total so far to 23 of Indiana's 92 counties with disaster declarations.

Shelters have been set up in almost every flooded county, housing at least 1,200 people overnight, said Homeland Security, which had no estimate on how many people were forced to leave their homes.

In Morgan County, southwest of Indianapolis, about 150 residents were taken out of a flooded nursing home. Floodwaters that were moving south to eventually drain into the Ohio River prompted officials to evacuate more than 250 patients and employees from Columbus Regional Hospital in southern Indiana. Workers pumped water out of the basement, and a couple inches of mud covered the first floor of the hospital, forcing that portion to close.

Jack Elkins, 67, has lived in Columbus since 1963 and said he has never experienced such serious flooding.

His condominium and others near the hospital were inundated with water in a matter of minutes Saturday night, he said. Once the storm drains filled up, it took 15 minutes for about 8 inches of water to ruin his place.

"It looked like a river in front of my house," he said as he took a break from ripping up ruined carpeting and flooring.

Gov. Daniels said many of the victims he spoke to when he visited Columbus, Martinsville and Terre Haute on Sunday told him similar stories about how quickly floodwaters rose, catching them off guard.

"This thing came on fast with such a radical deluge of water that people were describing going from a feeling of security to waist-deep water in a matter or 15 or 20 minutes," he told reporters Sunday. "... A 100-year-old event, that's apparently what we're dealing with here. Eleven or 12 inches of rain in one day is something that the terrain of our state, probably no state, is set up to handle."

Elkins estimated it would take at least $25,000 to fix his house, since he can do the work himself. He and his neighbors do not have flood insurance because the area has never dealt with the problem.

The rising White River also forced officials in the southern city of Seymour to order a mandatory evacuation of more than 100 homes.

More than 500 members of the Indiana National Guard were helping residents, including providing drinking water and search, rescue and security operations in Bartholomew County, where Columbus is located.

In western Indiana, Terre Haute also was dealing with serious flooding. Daniels said that there had been some looting reported in the city but that extra police had been sent to prevent it from happening again.

Travel was getting easier on a few major highways. Indiana State Police said Interstates 65 and 70 and U.S. 31 were reopened after being shut down for about a day. But several state highways remained closed as a result of the record flooding that continued along the White, Wabash and Flatrock rivers.

A Johnson County dam was breached by the high water but had not failed, said Erickson, the Homeland Security spokesman.

"It's in bad shape," he said. "Obviously we don't need any more rain."

Indiana caught a break on that front, at least for a day, as most of the state was hot and dry. However, more thunderstorms could hit central Indiana on Monday and continue into Tuesday, possibly dropping another inch of rain.

"If you get another inch or so of rain where they've already had 11 inches of rain, it doesn't help their situation, but it doesn't return to flooding anywhere near what they already saw," National Weather Service hydrologist Al Shipe said. "We're not out of the woods yet."

Part of southern Indiana from Spencer to Edwardsport could see high water as bad or worse than record flooding in 1913, forecasters say.

Besides high water, residents were also dealing with power outages. Duke Energy reported that 87,000 customers had lost power since Friday evening. Electric had been restored to all but 6,221 by Sunday morning, and those customers might have to wait as flooding was preventing crews from getting to downed lines and failed transformers, the utility said.