Douglas County, OR Roof Snow Load - 10 psf
What ASCE 7 says about snow load in Douglas County
That's Douglas County's design roof snow load per ASCE 7-22, for a typical heated single-family home - the number a permit reviewer starts from. Flat and low-pitch roofs in Douglas County are actually governed by ASCE 7's §7.3.4 minimum of 10 psf, not the 7 psf the ground-load formula alone would produce.
Converted to something you can actually eyeball on a roof: about 22 in. of fresh powder, 8 in. once it settles and packs down, or just 2 in. if it's turned to ice. This is a modest add-on to standard roof loading - ordinary residential construction carries it without extra bracing.
Douglas County at a glance
- Design roof snow load10 psf
- Ground snow load, ASCE 7 map10 psf
- National rank#1,706 of 2,758
- Oregon rank#8 of 15
- Population112,255
- Annual snowfall, NOAA normal11.7 in.
- FIPS41019
Where Douglas County's figure sits nationally
Out of 2,758 rated US counties, Douglas County sits at #1,706, the top 62% nationally - #8 of 15 within Oregon. 12 psf is Oregon's typical county figure - Douglas County comes in 2 psf under it.
Near 43.2863°N 123.1545°W, FIPS 41019: Douglas County counts 112,255 residents and a 10 psf map value, which the code's own factors turn into 10 psf.
How much it actually snows in Douglas County
Most winters bring Douglas County roughly 11.7 in. of snow - NOAA's normal at IDLEYLD PARK 4 NE, OR US, 11.2 mi off. (fresh vs. packed vs. ice explains why.)
Read this before you rely on it
Douglas County's number above is ASCE 7-22's default case, not a custom calculation: ordinary residential occupancy, heated, sited on ground that's neither fully sheltered nor fully exposed. Any one of those changing - pitch, exposure, heating, occupancy - moves the real figure.
Nothing here substitutes for an address-level number. Get one free, in about a minute, from the ASCE 7 Hazard Tool using your own coordinates rather than Douglas County's county-wide figure. (How this figure is calculated.)