Chelan County, WA Roof Snow Load - Case Study Area
Chelan County, WA: no map figure, on purpose
ASCE 7's own snow load map has no single figure for Chelan 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 53007, population 81,228. 386 US counties get this same case-study treatment; Chelan County is one of them.
Chelan County, WA: quick facts
- Population81,228
- Annual snowfall, NOAA normal39.5 in.
- FIPS53007
Chelan County's snowfall, most winters
39.5 in. a year: that's Chelan County's NOAA 1991-2020 snowfall normal, measured at ENTIAT FISH HATCHERY, WA US (17.8 mi away). See the density guide.
Before you rely on Chelan County's number
Treat the Chelan 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.