Shelley, ID: what USGS's seismic model says

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Shelley in Seismic Design Category D: High seismic hazard - this is the category most of coastal California, the Pacific Northwest, and other active fault regions fall into. Code mandates significant seismic detailing and restricts irregular structural configurations. This is the category the Brace + Bolt scope (cripple-wall bracing, foundation bolting) is built for. Rank it against the rest of the country and Shelley sits at the 81th percentile for seismic hazard among 4,875 US cities.

Where Shelley sits in Idaho

The raw figures: peak ground acceleration 0.176g, short-period spectral response 0.407g, 1-second spectral response 0.145g. Among 36 Idaho cities in this dataset, Shelley ranks 6 for seismic hazard, the 86th percentile within the state. About 5,262 people live in Shelley, Idaho.

Bracing and bolting: the actual cost

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

What this means for insurance

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 Shelley address.

More on how this number was built

The methodology guide covers exactly how USGS's public design-maps API produced Shelley'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.