Iowa Truck Mud Flap Law
Iowa has no mud-flap dimension rule. Its one fender-and-mud-flap regulation (761 IAC 450.2(14), for specially constructed and reconstructed vehicles) was rescinded in 2010, and Iowa Code chapter 321 sets no width or clearance number in its place. Older charts still show Iowa as regulated; the live code doesn't. A trooper can write a general equipment defect if a bare tire throws rock, but there's no flap-specific charge and no out-of-service. Minnesota next door enforces 9 inches (Minn. Stat. 169.733).
A detail here is flagged medium confidence — confirm with the state statute before you rely on it.
What Iowa makes you run
Iowa has no mud-flap dimension rule. Its one fender-and-mud-flap regulation (761 IAC 450.2(14), for specially constructed and reconstructed vehicles) was rescinded in 2010, and Iowa Code chapter 321 sets no width or clearance number in its place. Older charts still show Iowa as regulated; the live code doesn't. A trooper can write a general equipment defect if a bare tire throws rock, but there's no flap-specific charge and no out-of-service. Minnesota next door enforces 9 inches (Minn. Stat. 169.733).
Coverage and clearance
- Required: No specific statute
- Coverage: No set width. No current Iowa statute or rule states a tread-coverage figure.
- Ground clearance: No set clearance. Iowa's only fender/mud-flap administrative rule (761 IAC 450.2(14), covering specially constructed and reconstructed vehicles) was rescinded in 2010, and Iowa Code ch. 321 sets no mud-flap dimensions.
- Fine: No dedicated mud-flap fine. A general equipment/defective-vehicle citation is possible if a bare tire slings debris, usually a scheduled-fine, correctable ticket.
Iowa Mud Flap FAQ
Are mud flaps required on trucks in Iowa?
How low can mud flaps hang in Iowa?
What is the mud-flap fine in Iowa?
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 Traffic laws change and this can be out of date, so always confirm the current statute and obey posted signs before you rely on it.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://www.legis.iowa.gov/law/iowaCode/sections?codeChapter=321. See our Terms & Disclaimer.
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