Does The Dalles, OR need an earthquake retrofit?

Under the seismic model IBC and ASCE 7 use for new construction, The Dalles is Category C. 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. Nationally, The Dalles ranks above 77% of the 4,875 cities in this dataset for seismic hazard - the 77th percentile.

Where The Dalles sits in Oregon

USGS's underlying values for The Dalles: 0.203g peak ground acceleration, 0.452g at short period, 0.208g at 1 second. Within Oregon alone, The Dalles ranks 77 of 80 cities by seismic hazard - the 4th percentile in-state. The Dalles has a population of about 15,884.

What a retrofit costs in The Dalles

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.

Insuring against this, not just retrofitting

A The Dalles 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 The Dalles's figures come from

The Dalles'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 The Dalles.