Does Gresham, OR need an earthquake retrofit?

Gresham carries Seismic Design Category D under USGS's ASCE 7-16 model. 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 Gresham in the 88th percentile nationally for seismic hazard - higher than 88% of the 4,875 US cities USGS was checked against here.

How Gresham compares

USGS's underlying values for Gresham: 0.408g peak ground acceleration, 0.899g at short period, 0.376g at 1 second. Within Oregon alone, Gresham ranks 25 of 80 cities by seismic hazard - the 70th percentile in-state. Gresham has a population of about 111,507.

What a retrofit costs in Gresham

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 Oregon 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 Oregon.

Earthquake insurance for a Gresham home

A Gresham 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 Gresham's figures come from

Gresham'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 Gresham.