Yamhill County, OR Roof Snow Load - Case Study Area
What "Case Study" means for Yamhill County
ASCE 7's own snow load map has no single figure for Yamhill 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 41071, population 110,886. 386 US counties get this same case-study treatment; Yamhill County is one of them.
Yamhill County, OR: quick facts
- Population110,886
- Annual snowfall, NOAA normal13.3 in.
- FIPS41071
Yamhill County's snowfall, most winters
13.3 in. a year: that's Yamhill County's NOAA 1991-2020 snowfall normal, measured at HASKINS DAM, OR US (4.8 mi away). See the density guide.
Before you rely on Yamhill County's number
Treat the Yamhill 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.)