All oversize loads entering the City of Lewiston, located in Nez Perce County, must conform to the requirements set by the Idaho Department of Transportation.

In general, any vehicle over 8 feet 6 inches in width, 14 feet in height, and exceeding 80,000 pounds should obtain an oversize load permit from the Lewiston Public Works Department.

Due to the historical downtown area and the presence of the Clearwater River Bridge, specific route planning is essential to avoid structural limitations and traffic congestion in Lewiston. Loads exceeding certain weight limits may require a structural analysis of the chosen route.

Escort vehicles are required in Lewiston when the load exceeds 12 feet in width, 14 feet 6 inches in height, or 100 feet in length. Front and rear escorts may be required depending on the specific dimensions and route.

Local police escorts are typically required for loads exceeding 14 feet in width or those requiring lane closures on major thoroughfares like US-12. Fees for police escorts vary depending on the duration and complexity of the route, and scheduling must be arranged at least 72 hours in advance through the Lewiston Police Department's Traffic Division.

Applications for oversize/overweight permits in Lewiston can be obtained through the Idaho Department of Transportation's online permitting system. For specific questions related to Lewiston routes or local restrictions, contact the Lewiston Public Works Department at (208) 746-1316.

Documentation requirements include a detailed description of the load, vehicle dimensions, axle weights, proposed route, and proof of insurance. For exceptionally heavy loads, a structural analysis report from a qualified engineer may be required.

Time-of-day restrictions are in place for oversize loads traveling through downtown Lewiston during peak hours (7:00 AM - 9:00 AM and 4:00 PM - 6:00 PM) on weekdays.

Seasonal weight restrictions may be imposed on certain roads during the spring thaw (typically March-April) to prevent damage to road surfaces. Check with the Lewiston Public Works Department for specific road closures and weight limits.

Due to narrow streets and residential density, certain routes through the Normal Hill neighborhood are restricted for oversize loads. Consult the Lewiston street map for designated truck routes and avoid residential areas whenever possible.

Permit fees for oversize loads in Lewiston are based on the overall dimensions and weight of the load, as well as the distance traveled within city limits. The Idaho Department of Transportation's fee schedule applies, with potential additional fees assessed by the City of Lewiston for special circumstances.

Fees may increase for loads requiring multiple escorts, lane closures, or exceeding specific weight thresholds. A surcharge may be applied for weekend or holiday travel.