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DNR says May to April period wettest in Iowa’s history

Iowa flooding
DES MOINES – While most stream flows continue to drop and April had below-average rainfall, the past 12 months set records for the wettest May to April period in Iowa’s history. Surrounding states have also experienced record wet years.

Although snowpack melting is not expected to cause significant flooding in the Missouri River basin, annual runoff is expected to be 170 percent higher than normal, enhancing the risk for flooding in the eastern part of the basin.

“We are entering the three rainiest months, so wet conditions could continue,” said Tim Hall, DNR’s coordinator of hydrology resources. “There is lots of water in the soil and groundwater which could result in flash flooding.

“Iowans should monitor conditions carefully in the months ahead,” he added.

Streamflows in the interior streams have dropped from March levels except in northwest Iowa where they are still above normal or much above normal.

Major flooding has occurred along the Mississippi River, especially south of Dubuque. Davenport set a preliminary, but not official, record high flood crest of 22.7 feet on May 2. The previous crest of 22.63 feet was set July 9 in 1993.

Preliminary statewide precipitation in April totaled 2.96 inches or 0.55 inches below average, with a wide variation in local levels. In Montgomery County, rainfall in Red Oak was 2.61 inches below average for the month. While in Clinton County, the city of Clinton received 3.12 inches above average.

Information from Iowa DNR
Iowa temperatures averaged 49.2 degrees, or 0.3 degrees above normal, ranking April as the 72nd warmest among 147 years of state records. Clarinda reported the month’s high temperature of 87 degrees on April 21.

For a thorough review of Iowa’s water resource trends, go to

The report is prepared by technical staff from Iowa DNR, the Iowa Department of Agriculture and Land Stewardship, IIHR—Hydroscience and Engineering, and the U.S. Geological Survey, in collaboration with Iowa Homeland Security and Emergency Management Department.

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