Idaho oversize permits are valid for five days.
One half hour before sunrise to one-half hour after sunset, including Saturdays and Sundays (majority of routes). Up to and including 10′ wide, 110′ long or 14’6 high, travel is allowed 24/7 (majority of routes) with lighting as specified on permit.ed).
If over 13′ wide, movement prohibited between 6:30 – 8:30 a.m., 11:30 – 1:30 p.m., and 4:00 – 6:00 p.m. in Boise, Caldwell, Coeur d’Alene, Idaho Falls, Lewiston, Nampa, Pocatello, Twin Falls, Garden City and Chubbuck. Holiday travel restrictions may depend on dimension.
Length: 53′ semi-trailer on National Network, 48′ trailer on non-N.N. (“non-designated”). Note: Several 2-lane highways in Idaho are non-designated, including US-12 except in the Lewiston to Spalding, US-93 from Salmon to Challis, and US-95 from Council to Grangeville. For divisible loads, trailers exceeding 48’ are only allowed with an annual extra length permit, and the tractor-trailer off-track measurement must not exceed 5.50 feet (3.00 on a few mountain routes). Non-divisible loads are covered by single or annual permit, without regard to off-track amount.
Overhang: 4′ front, 10′ rear
Weight: 80,000 Gross Single – 20,000 Tandem – 34,000 Tridem – depends on spacings; Steer – 600 pounds per inch of tread width (13,200 pounds with 11″ tires)
Divisible Loads Exceeding 80,000: You can exceed 80,000 gross without a permit on state highways as long as you are legal on all axle/group weights and you are licensed for at least the amount of your gross weight. However, if you need any Interstate routes, you will need to get an Annual Excess Weight Permit.
ROUTINE PERMIT LIMITS:
Weight: Single – 33,000 to 22,000* Tandem – 56,000 to 38,500* Tridem – 70,500 to 48,000*
Steer – 600 pounds per inch of tread width (13,200 pounds for 11″ tires)
Loads exceeding these dimensions or are considered as Super Loads.s.
On 2-Lane Highways:
Width: Over 12′ – 1 escort; over 14′ – 2 escorts; over 16′ – may require 3 escorts
Height: Over 16′ – 1 escort.
Length: Over 100′ – 1 escort. Overhang: Over 25′ rear – 1 escort.– 2 escorts
On Interstate System:
Width: Over 15′ – 1 escort; over 16′ – may require 2 or 3 escorts
Height: Over 16′ – 1 escort.
Length: Over 120′ – 1 escort. Overhang: Over 25′ rear – 1 escort.
All lift axles must be on the ground if exceeding legal axle weights. Blades, buckets, etc. may be taken off and hauled on the same load, depending on route and situation. State will determine on a case-by-case b
SIGNS, FLAGS & LIGHTS:
Requirements are specified on Idaho permit. “Oversize Load” signs are required on all overwidth loads. Flags are required on all four corners and extremities of overwidth loads and on rear overhang exceeding 4′. Overweight only loads do not require signs or flags.
Remember, you are responsible for insuring the accuracy of any permits you are running on, for following the rules pertaining to them and for having any additional provision or conditions sheets required.