St. Clair Shores's Seismic Design Category, explained

St. Clair Shores 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, St. Clair Shores ranks above 29% of the 4,875 cities in this dataset for seismic hazard - the 29th percentile.

Where St. Clair Shores sits in Michigan

USGS's underlying values for St. Clair Shores: 0.048g peak ground acceleration, 0.096g at short period, 0.044g at 1 second. Within Michigan alone, St. Clair Shores ranks 59 of 153 cities by seismic hazard - the 62th percentile in-state. St. Clair Shores has a population of about 58,077.

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 Michigan 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 Michigan.

What this means for insurance

A St. Clair Shores 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 St. Clair Shores's figures come from

St. Clair Shores's Category B 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 B does and doesn't tell you about St. Clair Shores.