Spring Load Restrictions

Under the authority of SDCL 32-22-24, Highway Maintaining Authorities may restrict loads anytime from February 15 to April 30 to protect their highways from break-up during the spring thaw.

To avoid imposing Spring Load Restrictions earlier or longer than necessary, the South Dakota Department of Transportation monitors daily high and low temperatures at locations throughout the state and calculates accumulated freeze and thaw indexes. SDDOT also relies heavily on observed highway conditions and the experience of its field personnel to decide when to impose and remove load restrictions.

https://sdtruckinfo.sd.gov