Donaldsonville's Seismic Design Category, explained

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Donaldsonville in Seismic Design Category B: Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. Nationally, Donaldsonville ranks above 24% of the 4,875 cities in this dataset for seismic hazard - the 24th percentile.

Where Donaldsonville sits in Louisiana

The raw figures: peak ground acceleration 0.043g, short-period spectral response 0.087g, 1-second spectral response 0.054g. Among 59 Louisiana cities in this dataset, Donaldsonville ranks 28 for seismic hazard, the 53th percentile within the state. About 6,945 people live in Donaldsonville, Louisiana.

Bracing and bolting: the actual cost

Outside California, no state-level retrofit grant equivalent to Brace + Bolt could be found for Louisiana. A typical retrofit still runs $5,000-$10,000 nationally, about $7,000 for a common single-family job.

Insuring against this, not just retrofitting

Outside California, earthquake coverage is typically sold as an endorsement added to a standard homeowners policy, not a separate product - worth asking about directly when getting a home-insurance quote for a Donaldsonville address.

More on how this number was built

The methodology guide covers exactly how USGS's public design-maps API produced Donaldsonville's numbers. The guide to what a Seismic Design Category actually means covers why a category is never a substitute for an engineer's assessment of one specific house.