Oregon County, MO Roof Snow Load - 15 psf
What ASCE 7 says about snow load in Oregon County
That's Oregon County's design roof snow load per ASCE 7-22, for a typical heated single-family home - the number a permit reviewer starts from. ASCE 7's low-slope-roof minimum (§7.3.4) raises the governing figure to 15 psf - higher than the 10.5 psf the ground-load formula alone would give, and the code says use the larger one.
Converted to something you can actually eyeball on a roof: about 33 in. of fresh powder, 12 in. once it settles and packs down, or just 3 in. if it's turned to ice. This is a meaningful design load - most modern-code homes handle it fine, though an addition, a carport or a flat-roofed section can be a weak spot.
Oregon County, MO: quick facts
- Design roof snow load15 psf
- Ground snow load, ASCE 7 map15 psf
- National rank#1,566 of 2,758
- Missouri rank#109 of 115
- Population8,699
- Annual snowfall, NOAA normal6.7 in.
- FIPS29149
Where Oregon County's figure sits nationally
Out of 2,758 rated US counties, Oregon County sits at #1,566, the top 57% nationally - #109 of 115 within Missouri. Missouri counties average 18.6 psf; Oregon County runs 3.6 psf lower than that.
Near 36.6853°N 91.4018°W, FIPS 29149: Oregon County counts 8,699 residents and a 15 psf map value, which the code's own factors turn into 15 psf.
How much it actually snows in Oregon County
Most winters bring Oregon County roughly 6.7 in. of snow - NOAA's normal at HARDY, AR US, 29 mi off. 29 mi is a real gap between Oregon County and its nearest reporting station, so local snowfall can diverge from this figure, especially near elevation changes. (fresh vs. packed vs. ice explains why.)
Read this before you rely on it
Oregon 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 Oregon County's county-wide figure. (How this figure is calculated.)