General and special trade contractors primarily engaged in the construction of heavy projects, not elsewhere classified.

• Athletic field construction-general contractors
• Blasting, except building demolition-contractors
• Breakwater construction-general contractors
• Bridle path construction-general contractors
• Brush clearing or cutting-contractors
• Caisson drilling-contractors
• Canal construction-general contractors
• Central station construction-general contractors
• Channel construction-general contractors
• Channel cutoff construction-general contractors
• Chemical complex or facilities construction-general contractors
• Clearing of land-general contractors
• Cofferdam construction-general contractors
• Coke oven construction-general contractors
• Cutting right-of-way-general contractors
• Dam construction-general contractors
• Dike construction-general contractors
• Discharging station construction, mine-general contractors
• Dock construction-general contractors
• Drainage project construction-general contractors
• Dredging-general contractors
• Earth moving, not connected with building construction-general
• Flood control project construction-general contractors
• Furnace construction for industrial plants-general contractors
• Golf course construction-general contractors
• Harbor construction-general contractors
• Hydroelectric plant construction-general contractors
• Industrial incinerator construction-general contractors
• Industrial plant appurtenance construction-general contractors
• Irrigation projects construction-general contractors
• Jetty construction-general contractors
• Kiln construction-general contractors
• Land clearing-contractors
• Land drainage-contractors
• Land leveling (irrigation)-contractors
• Land reclamation-contractors
• Levee construction-general contractors
• Light and power plant construction-general contractors
• Loading station construction, mine-general contractors
• Lock and waterway construction-general contractors
• Marine construction-general contractors
• Mine loading and discharging station construction-general contractors
• Mining appurtenance construction-general contractors
• Missile facilities construction-general contractors
• Nuclear reactor containment structure construction-general contractors
• Oil refinery construction-general contractors
• Oven construction for industrial plants-general contractors
• Oven construction, bakers'-general contractors
• Petrochemical plant construction-general contractors
• Petroleum refinery construction-general contractors
• Pier construction-general contractors
• Pile driving-contractors
• Pond construction-general contractors
• Power plant construction-general contractors
• Railroad construction-general contractors
• Railway roadbed construction-general contractors
• Reclamation projects construction-general contractors
• Reservoir construction-general contractors
• Revetment construction-general contractors
• Rock removal, underwater-contractors
• Sewage treatment plant construction-general contractors
• Ski tow erection-general contractors
• Soil compacting service-contractors
• Submarine rock removal-general contractors
• Subway construction-general contractors
• Tennis court construction, outdoor-general contractors
• Timber removal, underwater-contractors
• Tipple construction-general contractors
• Trail building-general contractors
• Trailer camp construction-general contractors
• Trenching-contractors
• Washeries construction, mining-general contractors
• Waste disposal plant construction-general contractors
• Water power project construction-general contractors
• Water treatment plant construction-general contractors
• Waterway construction-general contractors
• Wharf construction-general contractors