All oversize loads entering the City of San Dimas, Los Angeles County, must conform to the requirements set by the California Department of Transportation (Caltrans) and San Dimas Municipal Code.

Generally, any vehicle exceeding 8 feet 6 inches in width, 14 feet in height, or operating with a gross vehicle weight exceeding 80,000 pounds requires an oversize/overweight load permit from Caltrans and potentially the City of San Dimas Public Works Department depending on the route.

Vehicles exceeding 10 feet in width or 15 feet in height often require a route survey within San Dimas to ensure clearance under bridges and overpasses along major thoroughfares like Arrow Highway and Bonita Avenue. Contact the San Dimas Public Works Department for survey requirements.

Escort vehicles are typically required in San Dimas when the load exceeds 12 feet in width, 16 feet in height, or extends more than 10 feet beyond the front or rear of the transporting vehicle. Specific requirements may vary based on the proposed route and time of day.

For loads exceeding 14 feet in width or 18 feet in height, a California Highway Patrol (CHP) escort may be required in addition to private escort vehicles. Contact the CHP Commercial Vehicle Enforcement Unit (CVEU) for scheduling and fee information. Expect to pay approximately $150/hour for CHP escort services, with a 4-hour minimum.

For permits specific to City of San Dimas roads, applications should be submitted to the San Dimas Public Works Department, located at 245 E. Bonita Avenue, San Dimas, CA 91773. Contact them at (909) 394-6260 for specific forms and procedures. Caltrans permits can be obtained online through the Caltrans website.

Required documentation typically includes a detailed description of the load, vehicle specifications, a proposed route map, and proof of insurance. For overweight loads, axle weight certifications may also be necessary. San Dimas may require a certificate of insurance naming the city as additionally insured.

Oversize load movements are generally restricted during peak traffic hours (7:00 AM - 9:00 AM and 4:00 PM - 6:00 PM) on weekdays within San Dimas. Weekend restrictions may also apply, particularly on major holidays.

Seasonal restrictions may be imposed during periods of high fire risk or during special events like the San Dimas Western Days celebration. Check with the Public Works Department for any temporary restrictions in effect.

Certain residential neighborhoods and narrow streets within San Dimas are restricted to oversize loads due to limited access and potential for damage. The Public Works Department will specify approved routes on the permit.

The City of San Dimas charges permit fees based on load size, weight, and the complexity of the route. Caltrans also has its own fee schedule.

Fees may vary depending on the number of days the permit is valid and whether any special accommodations are required, such as temporary lane closures or utility line adjustments.