Detour US 421 and SR 129
S.R. 56 will close near Lamb in Switzerland County for approximately 30 days beginning on or after Monday, June 10, weather permitting. The road will be closed 6.5 miles west of S.R. 129 for a $1.4 million bridge replacement project over Green Valley Creek.

Milestone Contractors was awarded the project in March 2018.
The official state detour for the closure is S.R. 129 and U.S. 421.

All-way stop coming to U.S. 421 in Downtown Madison
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