Costilla County, CO Roof Snow Load - Case Study Area
What "Case Study" means for Costilla County
ASCE 7's own snow load map has no single figure for Costilla County: the terrain is complex enough that the code (§7.2) requires an elevation-specific study rather than a county-wide value. That is the map being accurate, not a data gap.
FIPS 08023, population 3,686. 386 US counties get this same case-study treatment; Costilla County is one of them.
Costilla County at a glance
- Population3,686
- Annual snowfall, NOAA normal27.9 in.
- FIPS08023
Costilla County's snowfall, most winters
27.9 in. a year: that's Costilla County's NOAA 1991-2020 snowfall normal, measured at ALAMOSA SAN LUIS AP, CO US (26.2 mi away). That station is far enough away (26.2 mi) that local snowfall - especially at a different elevation or near a lake - can run noticeably higher or lower than this figure. See the density guide.
Before you rely on Costilla County's number
Treat the Costilla County figure as a starting point, not a final answer: it assumes standard occupancy, a heated structure and a moderately sheltered site, per ASCE 7-22's own defaults. Exposed terrain, an unheated building or a steeper roof all shift the real number.
For a real application, skip the county number and go straight to the ASCE 7 Hazard Tool - enter your coordinates and it returns a site-specific figure a plan reviewer will recognize. Details: the calculation guide.