Major flooding is expected on the Rock River at Moline by late Monday or early Tuesday, said Andy Ervin, meteorologist at the National Weather Service, Davenport.

As of Saturday night, the Rock River was forecast to crest at 14.5 feet late Monday or early Tuesday, according to the National Weather Service’s River Forecast Center in Chanhassen, Minn.

As of 8:30 p.m. Saturday, the Rock River stood at 10.68 feet in Moline. Flood stage is 12 feet. The river is expected to exceed flood stage some time this afternoon or evening.

The Rock River at Joslin, Ill., on Saturday afternoon was expected to crest at 16 feet Monday evening.

The Rock at Joslin stood at 11.57 feet at 8:30 p.m. Saturday. Flood stage there also is 12 feet.

Ervin said the expected flood in Moline is due to the near record flooding of the Green River in Geneseo, Ill.

The Green River was at 17.63 feet at 8:30 p.m. Saturday. Flood stage is 15 feet. The Green is expected to crest at 18.5 feet today.

“That’s the nature of that river,” Ervin said. “There are agricultural levies up and down that river and it tends to rise and fall quickly.”

The record crest on the Green is 18.77 feet set on Oct. 18, 1998.

He added that ice jams are entirely possible on the Rock at Moline due to the high water.

“We are not out of the woods with ice jams,” he said. “The fact that we are seeing such high water in the Rock is a concern. That high water pressure swirling around could break the ice loose.”

He added that the snowmelt has outweighed the rainfall in this flood. At least 1 inch of rain fell in the Quad-City area in general, and 1 to 2 inches fell along and east of the Rock River, all of which has exacerbated the problem of the snowmelt. Also, ice jams are still a wild card in the equation.

Snowmelt and rain caused flash flooding across major roads Saturday. Backed-up sewers caused manhole covers to pop off along River Drive, creating patches of high water. Interstate 80 around the Geneseo exit was closed and traffic rerouted for about two hours late Saturday afternoon.

The freezing rain and sleet that fell Saturday over the Quad-City area caused numerous traffic crashes and vehicles sliding off of roadways and into ditches, area police said.

But the ice should not last long and the rest of the snow will once again begin melting as partly sunny skies and a high of 35 degrees is on tap for today. The overnight low is expected to dip into the middle 20s.

Monday’s forecast is even nicer with sunny skies and a high of 40 degrees.

Thomas Geyer can be contacted at (563) 383-2328 or tgeyer@qctimes.com. Comment on this story at qctimes.com.

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