Officials at the Minnesota Department of Transportation say a culvert failure on Highway 99 continues to be a challenge for the agency, resulting in a decision to delay the highway opening. The highway closed east of Highway 13 on June 30 due to a failed culvert after heavy rains in the area. The stretch of road has remained closed since and will remain closed until crews can make a safe repair for motorists. MnDOT crews dug into the site last week in hopes of making repairs, but soon discovered the entire culvert needs to be replaced, which may require a design different from the one drafted in 2019. The state agency said via a news release Wednesday the problems are stemming from culvert sections separating, which can be attributed to a deeper foundation issue.