South Dakota oversize permit office

South Dakota Highway Patrol, Motor Carrier Services - Permit Center. Call 605-224-SEMI (7364), option 1, 7:00am - 7:00pm M-F Central time.

From South Dakota's own pages, checked 2026-10-24. Fees and rules change: the state's page is the last word.

Apply online
South Dakota Automated Permitting System (SDAPS)Source
How to get one
Apply online in SDAPS, or call the Permit Center at 605-224-7364 option 1 to order a permit by phone.
Single trip fee
The permit fee for an individual single-trip permit is $25. The fee for a book of 10 self-issuing single-trip permits is $250. Overweight adds two cents for each ton or fraction of a ton over the listed axle limits, for each mile on state trunk highways (not less than one dollar).Source
Legal without a permit
Width 102 inches · Height 14 feet · Length 53 feet semitrailer in a truck tractor-semitrailer combination; 45 feet single vehicle · Weight 80,000 pounds gross on the interstate highwaySource 1Source 2Source 3Source 4Source 5

When you can move

Daylight
Daylight only (half an hour before sunrise to half an hour after sunset) if an escort is needed, or the load is wider than 10 ft, higher than 14 ft 6 in, a single unit over 45 ft or a combination over 110 ft, can't keep up with posted speeds, or uses non-interstate state highways more than 2 miles from an interstate interchange.Source
At night
Night moves are allowed only if none of the daylight conditions apply (for example up to 10 ft wide on the interstate); otherwise only with DOT approval or for a public emergency.