Causeway
Ahkovak Street Causeway (North Slope Borough, Alaska)
Rehabilitated 2015Causeway over Isatkoak Lagoon on Ahkovak Street, one concrete culvertOpen to traffic
Mackworth Island Causeway (Cumberland County, Maine)
Built 1955; rehabilitated 2015Causeway with through plate girder (former swing) bridge over Casco Bay on Andrews AvenueRestricted - weight limit 4 tons, one vehicle at a time, all vehicles subject to inspection