The Wisconsin Department of Natural Resources says thousands of fish have died in Beaver Dam as a result of a culvert project.
Officials lowered the water level in the Beaver Dam River last week so construction work could be done near the river.
Beaver Dam Mayor Becky Glewen says the city followed DNR protocol by shutting water levels to the minimum level, but did not predict the impact on fish. Up to 5,000 fish died.
DNR officials met with the city's utility director Monday to discuss what happened and to prevent it from happening again.
Both the city and the contractor have a permit for the project, and have agreed to follow the DNR's recommendations to try to prevent another fish kill.