Officials with the Iowa Department of Transportation say eastbound Interstate 80 between exits 1A and 1B in Council Bluffs was reopened late Tuesday morning, after crews worked overnight to repair a void located in the median and under the shoulder. DOT officials told the Omaha World-Herald that the large hole that formed in the median was the result of Sunday’s heavy rainfall, combined with road construction work being done in the sandy, river-bottom soil.

The hole was about a half-mile from where a void was found in under I-80 in October. That hole, which also resulted in an overnight closure of the eastbound lanes, stretched under all three lanes. The hole discovered this week was mostly under the median and was roughly 4 feet deep and 15 feet wide. Monday’s hole was found in an area where a contractor installed a temporary storm sewer pipe several weeks ago. Rainwater washed out the sandy soil packed around the pipe.

Construction projects in the area are part of the Council Bluffs Interstate System Improvement Program, which is a large scale modernization and rehabilitation of the interstate system.