Causeway

Ahkovak Street Causeway (North Slope Borough, Alaska)
Rehabilitated 2015
Causeway over Isatkoak Lagoon on Ahkovak Street, one concrete culvert
Open to traffic

Mackworth Island Causeway (Cumberland County, Maine)
Built 1955; rehabilitated 2015
Causeway with through plate girder (former swing) bridge over Casco Bay on Andrews Avenue
Restricted - weight limit 4 tons, one vehicle at a time, all vehicles subject to inspection