Does Green River, WY need an earthquake retrofit?

Green River carries Seismic Design Category C under USGS's ASCE 7-16 model. Moderate seismic hazard. Code adds irregular-building restrictions and requires bracing of some nonstructural components (e.g. tall shelving, water heaters) in addition to structural detailing. That puts Green River in the 77th percentile nationally for seismic hazard - higher than 77% of the 4,875 US cities USGS was checked against here.

Where Green River sits in Wyoming

USGS's underlying values for Green River: 0.188g peak ground acceleration, 0.318g at short period, 0.087g at 1 second. Within Wyoming alone, Green River ranks 8 of 16 cities by seismic hazard - the 53th percentile in-state. Green River has a population of about 11,474.

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 Wyoming 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 Wyoming.

Earthquake insurance for a Green River home

A Green River 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 Green River's figures come from

Green River's Category C 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 C does and doesn't tell you about Green River.