PEORIA HEIGHTS, Ill. — More rain on Tuesday was the last thing flood fighters across the Midwest wanted to see, adding more water to swollen rivers that are now expected to remain high into next month.
Flood water was rising to record levels along the Illinois River in central Illinois. In Missouri, six small levees north of St. Louis were overtopped by the surging Mississippi River, though mostly farmland was affected.
The Mississippi and Illinois rivers have crested in some places, but that doesn’t mean the danger is over. The National Weather Service predicts a very slow descent, due in part to the additional rain expected to amount to an inch or so across several Midwestern states.
‘‘The longer the crest, definitely, the more strain there is on the levee,’’ said Mike Petersen, a spokesman for the US Army Corps of Engineers in St. Louis.
The biggest problem areas were in Illinois, on the Illinois River. In Peoria Heights, roads and buildings were flooded and riverfront structures were inundated. Firefighters feared that if fuel from businesses and vehicles starts to leak, it could spark a fire in areas that could be reached only by boat.
‘‘That’s our nightmare: A building burns and we can’t get to it,’’ said Peoria Heights Fire Chief Greg Walters. ‘‘These are combustible buildings and we have no access to them simply because of the flooding.’’
About 20 to 30 homes and businesses near the river have been evacuated, he said.
Among those still in their homes was Mark Reatherford, a 52-year-old unemployed baker. He has lived in the same house for two decades, a split-level home with a gorgeous view: a small park between him and the Illinois River.
By Tuesday afternoon, the river had rolled over the park and made it to Reatherford’s home, creating a 3-foot-deep mess in the basement. Reatherford had cleared out the basement furniture and was hopeful the main floor would stay dry.
Now, he’s considering moving. ‘‘You can’t get a better view than what we’ve got here,’’ Reatherford said. ‘‘The sun comes up over the river, moon comes up . . . and now you’ve got this. I’m getting too old to deal with this.’’
In nearby Chillicothe, more than 400 homes have been affected by the flood, said Vicky Turner, director of the Peoria County Emergency Management Agency. Many homes have been evacuated, but others whose owners have had their buildings raised over the years because of flooding have chosen to stay put, Turner said.
‘‘They row back and forth . . . up to the main road,’’ she said.
In Missouri, officials in the flood-weary hamlet of Clarksville were optimistic that days of sandbagging would hold back the Mississippi. At times toiling in heavy rain, crews built a second wall of dirt and sandbags behind the original barrier, and by Tuesday morning calm was restored. The Mississippi appeared to be receding, ever so slowly, from the community 70 miles north of St. Louis.
‘‘We’re feeling much better,’’ Mayor Jo Anne Smiley said. ‘‘It is amazing what you can do, and when it doesn’t work you go to Plan B, Plan C, or Plan D.’’
There were other snippets of good news elsewhere.
Lucas Schultz, the 12-year-old Smithton, Ill., boy who was rescued from the flood water of a river in Missouri on Sunday, was at home and doing fine.
Lucas was in Leadwood, Mo., trying to cross a bridge with two other boys when he fell into the Big River near a culvert pipe. He was sucked into the pipe, came out the other side, and went floating down the river.