TOWN OF CALEDONIA, Wis. -

A two-vehicle accident on Interstate 90-94 near Portage caused a massive backup for several hours affecting drivers coming south toward Madison Friday morning and part of the afternoon.

The accident happened just before 10 a.m. in the eastbound lanes of Interstate 90 at mile marker 105, just west of the Wisconsin 33 interchange.

The State Patrol said a National Guard passenger bus was driving west on I-90 when it hydroplaned, causing the driver, 60-year-old Robert Davis of Reeseville, to lose control. The bus crossed the median into eastbound lanes and came to rest in the right ditch, according to a statement Friday afternoon.

A 2005 Jaguar driving east on I-90 swerved to avoid the bus and struck debris, cracking the car's windshield, the statement said.

The Jaguar driver, Curtis Axen, 62, and his passenger Dianne Axen, 63, both of Rochester, Minn.,  were taken to Divine Savior for treatment of non-life-threatening injuries, the state patrol said.

A dispatcher said the occupants of the bus are all OK.

Traffic was backed up for about 3 miles eastbound, going toward Madison, from 10:30 a.m. until about 1 p.m. Friday.