Design Standards

Design review1 & 2 Family Dwellings: 
  • Seismic category D1
  • Wind design speed – 95 mph
Commercial Buildings
  • Ultimate wind design speed is based on the use and importance (risk category) of the structure.
  • Risk Category I – 115 mph
Minor storage buildings, Agricultural buildings, certain temporary buildings
  • Risk Category II – 120 mph
Residential Buildings, offices, industrial buildings, etc.
  • Risk Category III & IV – 130 mph
Schools (more than 250 occupants), universities (more than 500 occupants), emergency services (fire, police, ambulance, hospital), etc.
  • See OSSC Table 1604.5 for additional risk category descriptions.
  • Seismic category D (see OSSC Tables 1613.3.5(1) and (2) for more detailed information)
Elevation: 285 feet
Climate Zone: 1
County: Clackamas and Washington Counties
Zip Code: 97070
Frost depth: 12 inches
Ground Snow = 9 psf
Latitude: 45.339927
Longitude: 122.767539
Snow Load: Lookup Online