Example of a weight restricted bridge. The Ames Lake Trestle Bridge was built nearly 100 years ago and was originally designed with narrow lanes for much smaller vehicles compared with what we see on the road today. The bridge has a posted weight restriction for specific large trucks and specialized hauling vehicles. A project to replace Ames Lake Trestle Bridge is anticipated to begin in spring 2024.
Frequently asked questions
• Requirement to rate bridge’s ability to carry four additional types of “special haul vehicles.” These are authorized vehicles on roadways that can have heavier loads.
• Requirement to evaluate and rate the gusset plates. A gusset plate is used in between the intersection of two columns or beams and in connection points on bridges with steel trusses.
No. Speed limits are not based on weight restrictions.
Many vehicles like school buses, fire engines and ambulances are still allowed depending on their weight and the loads they carry. We continue to update fire districts if and when there is a weight restriction or a new one is put in place. Truck companies and agencies can email the county at email@example.com with questions and requests about specific bridges. Inquiries should include information about truck weights, including the weight of any loads, and information on how the vehicle distributes the weight (spacing between each axle and loads on each axle). If the truck, fully loaded, exceed legal loads, or posted load signs, companies or agencies can apply for “over legal load” permits. More about overlegal load permits.
Advanced warning signs and turn-around signs are posted on roadways to inform truck drivers that they are approaching a weight restricted bridge.