Oregon Truck Mud Flap Law
Oregon sets a hard 10-inch ceiling. Your fenders or mudguards must run the full tire width and hang within 10 inches of the road when empty, 13 inches for a raising dump box (ORS 815.180). Driving without proper mudguards is a Class C traffic violation, roughly a $165 fine (ORS 815.185). An inspector measures the guard unladen, since an empty truck rides high. A short, torn, or missing guard gets you written up as an equipment violation.
What Oregon makes you run
Oregon sets a hard 10-inch ceiling. Your fenders or mudguards must run the full tire width and hang within 10 inches of the road when empty, 13 inches for a raising dump box (ORS 815.180). Driving without proper mudguards is a Class C traffic violation, roughly a $165 fine (ORS 815.185). An inspector measures the guard unladen, since an empty truck rides high. A short, torn, or missing guard gets you written up as an equipment violation.
Coverage and clearance
- Required: Yes
- Coverage: Full width of the tire, or the combined width of multiple tires, measured across the tread.
- Ground clearance: Full-width fenders or mudguards must hang no more than 10 inches above the road when the vehicle is empty, or 13 inches if attached to a dump box that raises to unload (ORS 815.180/815.182).
- Fine: Class C traffic violation; presumptive fine about $165 (ORS 815.185).
Oregon Mud Flap FAQ
Are mud flaps required on trucks in Oregon?
How low can mud flaps hang in Oregon?
What is the mud-flap fine in Oregon?
Reference information for planning, not legal advice. Traffic laws change and this can be out of date, so always confirm the current statute and obey posted signs before you rely on it. Last reviewed July 2026. Source: https://oregon.public.law/statutes/ors_815.185. See our Terms & Disclaimer.
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