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Hannah Ray J Childs kayaks at a whitewater park she helped create on the Maquoketa River Thursday, May 7, 2026, in Manchester, Iowa. (AP Photo/Brittany Peterson)

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A stream cuts through a farm field Thursday, May 7, 2026, near Marshalltown, Iowa. (AP Photo/Brittany Peterson)

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Hannah Ray J Childs, right, throws a toy for her dog as her husband Marty Colbert watches at a whitewater park she helped create on the Maquoketa River, Thursday, May 7, 2026, in Manchester, Iowa. (AP Photo/Brittany Peterson)

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Mary Swander looks out over Lake Darling, Friday, May 8, 2026, in Brighton, Iowa. (AP Photo/Brittany Peterson)

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Drake University student Harrison Ziegler dips a bottle in a stream to collect a water sample Wednesday, May 6, 2026, in Des Moines, Iowa. (AP Photo/Brittany Peterson)

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A Drake University student holds a phosphate test strip after sampling water from a stream Wednesday, May 6, 2026, in Des Moines, Iowa. (AP Photo/Brittany Peterson)

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Drake University professor Claire Hruby looks at cyanobacteria, or blue-green algae, under a microscope Wednesday, May 6, 2026, in Des Moines, Iowa. (AP Photo/Brittany Peterson)

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People fish along the Maquoketa River, Thursday, May 7, 2026, in Manchester, Iowa. (AP Photo/Brittany Peterson)

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This photo shows farmland Friday, May 8, 2026, near Ely, Iowa. (AP Photo/Brittany Peterson)