Washington Weigh Stations & Ag Inspection

When Washington makes you pull in

When a Washington scale is lit and the ramp signal points you in, you enter. The State Patrol runs the ports, and RCW 46.44.105 makes ducking an open scale unlawful on top of any weight fine. Weigh-in-motion pre-screens I-5 and I-90 traffic, so plenty of trucks roll straight past. Hauling cattle over 40,000 lb? You must stop at a WSP port of entry or eat a $1,000 penalty (RCW 46.44.200).

Stations, bypass, and inspection

• Who must stop: Only when a sign directs
• Where the stations are: Fixed State Patrol scales cluster on I-5 (Bow Hill, Ridgefield, Kelso, and the SeaTac area) and I-90 (Cle Elum, Tokio, Spokane), with more on I-82 and US routes. Signs and ramp signals show OPEN or dark; hours vary. Weigh-in-motion sensors pre-screen mainline trucks, so many never leave the highway even when a scale is open.
• Bypass: Drivewyze (app/ELD) works at Washington scales. The state's fixed sites read NORPASS transponders, the Pacific Northwest bypass program, and PrePass transponders interoperate at many Washington locations. A green reading keeps you on the mainline; a red or no signal means pull in and stop.
• Ag / border inspection: No mandatory produce-inspection stations for through traffic. WSDA runs pest and nursery quarantine programs off the highway, not a roadside ag stop like California's. The border produce stations that matter to you sit south, on the California state line.
• Fine for passing an open station: Ducking an open WSP scale violates RCW 46.44.105, and that penalty rides on top of any overweight fine (the weight schedule runs from a few cents per pound into the thousands). The cattle rule is regional, not statewide. A rig with a gross vehicle weight rating over 40,000 lb hauling cattle into Washington must stop immediately at the WSP port of entry, and the flat $1,000 penalty applies only in a county east of the Cascade crest with at least 450,000 residents plus the adjacent county of at least 13,000 but under 15,000, which works out to Spokane and Pend Oreille (RCW 46.44.200). Cattle under a pasture permit or consigned to a public auction or sales yard are exempt, though none of that ever lets you bypass an open scale.

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