Custer County, ID Roof Snow Load - Case Study Area
What "Case Study" means for Custer County
ASCE 7's own snow load map has no single figure for Custer 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 16037, population 4,597. 386 US counties get this same case-study treatment; Custer County is one of them.
Custer County at a glance
- Population4,597
- Annual snowfall, NOAA normal18.3 in.
- FIPS16037
Custer County's snowfall, most winters
18.3 in. a year: that's Custer County's NOAA 1991-2020 snowfall normal, measured at CHILLY BARTON FLAT, ID US (29.3 mi away). 29.3 mi is a real gap between Custer County and its nearest reporting station, so local snowfall can diverge from this figure, especially near elevation changes. See the density guide.
Before you rely on Custer County's number
Treat the Custer 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. (How this figure is calculated.)