(Radio Iowa) – Many parks, trails, waterways and docks in northeast Iowa are reopening as early summer floodwaters recede, but safety for parkgoers remains a concern as bacteria and other contaminant levels in area rivers remain high. Lori Eberhard, park director for George Wyth State Park in Black Hawk County, says even though the rivers might look safer with the water levels down, the risk of illness for swimmers remains high.

“If our bacteria level’s high at the beach, I would still swim there before I would swim in the river after flooding,” Eberhard says, “especially when you have major flooding, it gets into those different systems all the way down the river, and that’s what’s in the water.” The Iowa D-N-R tests bodies of water weekly to track those levels, but contaminants are still elevated due to stagnation and sediment that comes with flooding. When hiking, Eberhard stresses caution even when the ground appears stable.

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“There are low spots that still have water on them,” she says. “We don’t recommend going through flooded trails or water, because you don’t know what’s under there, you don’t know if there’s a hole or things like that. And now, with all the water along the trails, trees will just fall down.”

The D-N-R says around a dozen beaches at Iowa lakes are not recommended for swimming this week due to high levels of e-coli, algae toxins, or both.