Marion County, OR Roof Snow Load - Case Study Area
Marion County, OR: no map figure, on purpose
ASCE 7's own snow load map has no single figure for Marion 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 41047, population 352,867. 386 US counties get this same case-study treatment; Marion County is one of them.
Marion County at a glance
- Population352,867
- Annual snowfall, NOAA normal16 in.
- FIPS41047
Marion County: average annual snowfall
Marion County sees about 16 in. of snow most winters, per the STAYTON 6 ENE, OR US station's 1991-2020 NOAA normal. See the density guide.
Read this before you use Marion County's figure
The figure above assumes the case ASCE 7-22 treats as typical: a heated, ordinary-occupancy home on a partially exposed site. Change any of those - exposure, heating, roof pitch, occupancy category - and the real design number moves.
A building permit needs the number at your exact address, not the county average - the free ASCE 7 Hazard Tool returns that from your coordinates in about a minute and produces a PDF a plan reviewer will accept. Details: the calculation guide.