Washington County, OK Roof Snow Load - 15 psf
What ASCE 7 says about snow load in Washington County
That's Washington County's design roof snow load per ASCE 7-22, for a typical heated single-family home - the number a permit reviewer starts from. The physics-based figure alone would be 10.5 psf, but ASCE 7's own low-slope minimum (§7.3.4) sets a floor of 15 psf for flat and low-pitch roofs here, which is the number that actually governs.
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. Modern-code homes carry a load like this without issue; an older addition, a carport, or any flat-roofed section is where it is worth checking first.
Already snow on the roof in Washington County?
Washington County in numbers
- Design roof snow load15 psf
- Ground snow load, ASCE 7 map15 psf
- National rank#1,376 of 2,758
- Oklahoma rank#4 of 77
- Population54,060
- Annual snowfall, NOAA normal8.2 in.
- FIPS40147
Where Washington County's figure sits nationally
Out of 2,758 rated US counties, Washington County sits at #1,376, the top 50% nationally - #4 of 77 within Oklahoma. That's 4 psf above Oklahoma's own county-average design load of 11 psf.
Near 36.7044°N 95.9063°W, FIPS 40147: Washington County counts 54,060 residents and a 15 psf map value, which the code's own factors turn into 15 psf.
How much it actually snows in Washington County
Most winters bring Washington County roughly 8.2 in. of snow - NOAA's normal at BARTLESVILLE F P FLD, OK US, 8 mi off. (fresh vs. packed vs. ice explains why.)
Read this before you rely on it
Washington 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 Washington County's county-wide figure. (How this figure is calculated.)