Does Dardenne Prairie, MO need an earthquake retrofit?

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Dardenne Prairie 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. That puts Dardenne Prairie in the 80th percentile nationally for seismic hazard - higher than 80% of the 4,875 US cities USGS was checked against here.

Dardenne Prairie by the numbers

USGS's underlying values for Dardenne Prairie: 0.171g peak ground acceleration, 0.324g at short period, 0.137g at 1 second. Within Missouri alone, Dardenne Prairie ranks 62 of 135 cities by seismic hazard - the 54th percentile in-state. Dardenne Prairie has a population of about 14,407.

Bracing and bolting: the actual cost

A full earthquake retrofit typically runs $5,000-$10,000 nationally (around $7,000 typical), driven mainly by house size and foundation type, not by Missouri specifically. California's Earthquake Brace + Bolt grant, which covers a large share of this cost, is a California-only program and does not apply in Missouri.

Earthquake insurance for a Dardenne Prairie home

A Dardenne Prairie homeowner cannot buy a standalone earthquake policy in most cases - it is added to an existing homeowners policy as an endorsement, so the place to start is a regular home-insurance quote.

Where Dardenne Prairie's figures come from

Dardenne Prairie's Category D and every number above trace to USGS's own ASCE 7-16 Design Maps service - see the methodology guide. See the category explainer for what Category D does and doesn't tell you about Dardenne Prairie.