Does West Linn, OR need an earthquake retrofit?

Under the seismic model IBC and ASCE 7 use for new construction, West Linn is 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. Rank it against the rest of the country and West Linn sits at the 87th percentile for seismic hazard among 4,875 US cities.

West Linn by the numbers

USGS's underlying values for West Linn: 0.38g peak ground acceleration, 0.845g at short period, 0.379g at 1 second. Within Oregon alone, West Linn ranks 45 of 80 cities by seismic hazard - the 44th percentile in-state. West Linn has a population of about 26,597.

What a retrofit costs in West Linn

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.

What this means for insurance

A West Linn 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 West Linn's figures come from

West Linn'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 West Linn.