The Meridian Arch Suspension bridge in red oxide spans 325 mm, but the deck can be adjusted by upto 100mm to fit an existing gap. It takes a single road at OO, but they are designed to sit side-by-side to take multiple roads. More than once can be combined with a pier kit to span greater lengths. 
 
The bridge is straighforward to build, but you do need tweezers to locate the arch braces and PVA glue to fix.