Iowa Oversize Permits are valid for 5 days. Driver must have the Iowa DOT permit before entering the state.
Permitted vehicles up to 100′ in length, 11′ width, 14’4 height may have continuous travel seven days a week (24/7), provided travel is on the roadway with a minimum width of 22 feet and minimum lane width of 11 feet, and with safety lighting as specified on Iowa provisions sheet. Larger loads may travel one-half hour before sunrise to one-half hour after sunset, including Saturdays and Sundays.
No travel allowed starting 12 noon the day prior to major holidays and holiday weekends. Des Moines I-235 travel prohibited from 7:00 – 9:00 A.M. and from 4:00 – 6:00 P.M. Monday through Friday. Other highways in Des Moines can be included under the curfew at officer’s discretion if traffic is heavy.
Maximum posted limits unless otherwise specified on permit.
The vehicle must have the following characteristics:
*Note: You must be licensed for as much as you wish to permit in Iowa. Loads exceeding these dimensions or weight are considered as super loads.
“Oversize Load” signs and flags are required when a vehicle and load exceeds 75′ in length, 8’6 width, and/or 14’4 in height. Flags are required for rear overhang exceeding 4 feet on all permitted vehicles/ loads. Flags should be mounted at each front corner of the towing unit, at each rear corner of the load, and at any wide points/protrusions of the load. An amber revolving light at least 7″ high and 7″ in diameter is required on the towing unit whenever length exceeds 85′, front overhang exceeds 25′ or rear overhang exceeds 10′ (light should be on the load in the rear) or weight exceeds 80,000 lbs. An escort can be used in lieu of amber light.