Marshall County, OK Roof Snow Load - 5 psf
What ASCE 7 says about snow load in Marshall County
That's Marshall 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 5 psf - higher than the 3.5 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 11 in. of fresh powder, 4 in. once it settles and packs down, or just 1 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.
Marshall County at a glance
- Design roof snow load5 psf
- Ground snow load, ASCE 7 map5 psf
- National rank#2,328 of 2,758
- Oklahoma rank#74 of 77
- Population16,147
- Annual snowfall, NOAA normal2.3 in.
- FIPS40095
Where Marshall County's figure sits nationally
Out of 2,758 rated US counties, Marshall County sits at #2,328, the top 84% nationally - #74 of 77 within Oklahoma. Oklahoma counties average 11 psf; Marshall County runs 6 psf lower than that.
Near 34.027°N 96.7705°W, FIPS 40095: Marshall County counts 16,147 residents and a 5 psf map value, which the code's own factors turn into 5 psf.
How much it actually snows in Marshall County
Most winters bring Marshall County roughly 2.3 in. of snow - NOAA's normal at MADILL, OK US, 4.5 mi off. (fresh vs. packed vs. ice explains why.)
Read this before you rely on it
Marshall 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 Marshall County's county-wide figure. Details: the calculation guide.