How much flood risk does Alamosa County actually carry?
Alamosa County lands at the 43.7th percentile of FEMA's National Risk Index for flooding, "Relatively Low" territory — below the national norm for flood hazard — with the hazard driven by inland rivers and flash flooding rather than the coast — FEMA's model puts a flood event here at about once every 14 years. This describes the county, not any one street — FEMA only publishes exact parcel zones through a live map service.
Mandatory flood insurance compliance in Alamosa County
Alamosa County is one of the counties where FEMA's own denominator for mandated flood-zone structures is missing, so no compliance rate is shown rather than a guessed one — the data quality guide covers how common this is. Across all residential structures in Alamosa County, not just the ones FEMA mandates, 0.6% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
Alamosa County against the rest of the country
Alamosa County sits at rank 1830 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 1993 of 3144 by population (1 is biggest). Alamosa County, Colorado covers 722.645 square miles and counts roughly 16,689 residents.
Your street may differ from Alamosa County's average
Across all of Alamosa County's 6,989 residential structures, 40 carry an NFIP policy today — a county-wide count that still can't tell you one address's own mapped zone.
More on how this number was built
The methodology guide shows exactly which FEMA and Census tables feed Alamosa County's numbers. See the data quality guide for why Alamosa County, like hundreds of other counties, doesn't get a clean compliance percentage.