All oversize loads entering the City of Dayton must conform to the requirements set by the Washington Department of Transportation and local Dayton ordinances.

In general, any vehicle exceeding 8 feet 6 inches in width, 14 feet in height, or operating with a gross vehicle weight exceeding 80,000 pounds should obtain an oversize load permit from the Dayton Public Works Department. Note that this is in Columbia County, Washington.

Loads exceeding 10 feet in width or 15 feet in height may require a route survey to ensure clearance under the Patit Creek Bridge on Highway 12 or other low-clearance structures within the city limits. Contact the Dayton Public Works Department to schedule a survey.

Escort vehicles are typically required for loads exceeding 12 feet in width, 15 feet in height, or 100 feet in length within the city limits of Dayton. Exact requirements depend on the specific route and potential obstructions.

Local police escorts are required for any load deemed to pose a significant risk to public safety. This may include loads with extreme dimensions or those traveling during peak traffic hours. Contact the Columbia County Sheriff's Office for police escort availability and associated fees, which typically run $75 per hour with a 2-hour minimum.

To apply for an oversize load permit in Dayton, contact the Dayton Public Works Department. While there isn't a dedicated online portal, you can download the application form from the City of Dayton website (check under 'Permits & Licenses' in the Public Works section). You can also call them directly at (509) 382-2101.

Documentation requirements include a detailed description of the load, vehicle specifications, proposed route, and proof of insurance. For loads exceeding 14 feet in height, a signed statement from a qualified engineer confirming the stability of the load may be required.

Time-of-day restrictions may apply to oversize loads traveling through downtown Dayton, particularly during school hours (7:30 AM - 8:30 AM and 2:30 PM - 3:30 PM) on weekdays. Check with the Public Works Department for specific restrictions on your route.

Seasonal restrictions may be implemented during harvest season (late summer/early fall) due to increased agricultural traffic on local roads. Be sure to inquire about any temporary restrictions before planning your transport.

Avoid using Main Street (Highway 12) during peak hours if possible. Residential areas on the east side of town have narrow streets and should be avoided if your load width is over 10 feet.

The standard permit fee for oversize loads in Dayton is $25, which covers basic administrative costs. Additional charges may apply for loads requiring route surveys, police escorts, or exceeding weight limits.

Fees vary based on several factors, including the overall dimensions of the load, the distance traveled within city limits, and the complexity of the route. For example, loads requiring a route survey will incur an additional fee of $50.