Does Grand Junction, CO need an earthquake retrofit?

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Grand Junction in Seismic Design Category B: Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. Rank it against the rest of the country and Grand Junction sits at the 60th percentile for seismic hazard among 4,875 US cities.

How Grand Junction compares

The raw figures: peak ground acceleration 0.132g, short-period spectral response 0.239g, 1-second spectral response 0.066g. Among 79 Colorado cities in this dataset, Grand Junction ranks 20 for seismic hazard, the 76th percentile within the state. About 70,554 people live in Grand Junction, Colorado.

Retrofit economics for Grand Junction

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

Insuring against this, not just retrofitting

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 Grand Junction address.

More on how this number was built

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