Commerce City, CO: what USGS's seismic model says

Commerce City carries Seismic Design Category B under USGS's ASCE 7-16 model. Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. Nationally, Commerce City ranks above 55% of the 4,875 cities in this dataset for seismic hazard - the 55th percentile.

Commerce City by the numbers

The raw figures: peak ground acceleration 0.098g, short-period spectral response 0.184g, 1-second spectral response 0.054g. Among 79 Colorado cities in this dataset, Commerce City ranks 57 for seismic hazard, the 28th percentile within the state. About 70,245 people live in Commerce City, Colorado.

What a retrofit costs in Commerce City

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.

Earthquake insurance for a Commerce City 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 Commerce City address.

More on how this number was built

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