Does Douglas, WY need an earthquake retrofit?

Under the seismic model IBC and ASCE 7 use for new construction, Douglas is Category C. Moderate seismic hazard. Code adds irregular-building restrictions and requires bracing of some nonstructural components (e.g. tall shelving, water heaters) in addition to structural detailing. Nationally, Douglas ranks above 77% of the 4,875 cities in this dataset for seismic hazard - the 77th percentile.

How Douglas compares

The raw figures: peak ground acceleration 0.207g, short-period spectral response 0.336g, 1-second spectral response 0.071g. Among 16 Wyoming cities in this dataset, Douglas ranks 6 for seismic hazard, the 67th percentile within the state. About 6,442 people live in Douglas, Wyoming.

What a retrofit costs in Douglas

Outside California, no state-level retrofit grant equivalent to Brace + Bolt could be found for Wyoming. A typical retrofit still runs $5,000-$10,000 nationally, about $7,000 for a common single-family job.

Earthquake insurance for a Douglas home

Outside California, earthquake coverage is typically sold as an endorsement added to a standard homeowners policy, not a separate product - worth asking about directly when getting a home-insurance quote for a Douglas address.

More on how this number was built

The methodology guide covers exactly how USGS's public design-maps API produced Douglas's numbers. The guide to what a Seismic Design Category actually means covers why a category is never a substitute for an engineer's assessment of one specific house.