Crook County, OR Roof Snow Load - 10 psf
Crook County, OR roof snow load, translated
A typical heated home in Crook County is designed to carry 10 pounds per square foot of snow on its roof, per ASCE 7-22. The physics-based figure alone would be 7 psf, but ASCE 7's own low-slope minimum (§7.3.4) sets a floor of 10 psf for flat and low-pitch roofs here, which is the number that actually governs.
On a roof that means 22 in. of fresh snow, 8 in. once it packs down, or 2 in. of solid ice - three very different piles for the same load. Standard residential construction handles a load this size without extra bracing; it is a modest addition on top of ordinary roof loading.
Crook County, OR: quick facts
- Design roof snow load10 psf
- Ground snow load, ASCE 7 map10 psf
- National rank#1,860 of 2,758
- Oregon rank#11 of 15
- Population27,336
- Annual snowfall, NOAA normal30.5 in.
- FIPS41013
Where Crook County ranks
#11 of 15 Oregon counties by design load, top 67% of 2,758 nationally - that's Crook County's spot. That's 2 psf below Oregon's own county-average design load of 12 psf.
FIPS 41013, population 27,336, centered near 44.1631°N 120.3716°W. ASCE 7's underlying ground snow load here is 10 psf before the code's exposure and importance factors bring it to the 10 psf design figure above.
Crook County: average annual snowfall
Crook County sees about 30.5 in. of snow most winters, per the BARNES STN, OR US station's 1991-2020 NOAA normal. See the density guide.
Read this before you use Crook 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.