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1 & 2 Family Dwellings:
Seismic category D1
Wind design speed – 95 mph
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)
Clackamas and Washington Counties
Ground Snow =
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