The declarations apply to drivers hauling gasoline, diesel and aviation fuel. In South Dakota, Gov. Kristi Noem's order points to low inventories and outages of fuel, while the "return of normal supply flows to fuel terminals in South Dakota is not expected until early fall."

The Wyoming order from Gov. Mark Gordon notes increased post-pandemic travel and an early and severe wildfire season in the region have both contributed to fuel shortages in the state.

The South Dakota waiver will expire no later than midnight, Aug. 16, and the Wyoming waiver will expire no later than Aug. 20.