Williams County, ND Roof Snow Load - 21 psf
What ASCE 7 says about snow load in Williams County
That's Williams County's design roof snow load per ASCE 7-22, for a typical heated single-family home - the number a permit reviewer starts from.
Converted to something you can actually eyeball on a roof: about 46.2 in. of fresh powder, 16.8 in. once it settles and packs down, or just 4.2 in. if it's turned to ice. A meaningful design load. Most homes built to modern code handle it, but additions, carports, and flat-roofed sections are worth a second look.
Williams County in numbers
- Design roof snow load21 psf
- Ground snow load, ASCE 7 map30 psf
- National rank#439 of 2,758
- North Dakota rank#45 of 49
- Population40,763
- Annual snowfall, NOAA normal48.2 in.
- FIPS38105
Where Williams County's figure sits nationally
Out of 2,758 rated US counties, Williams County sits at #439, the top 16% nationally - #45 of 49 within North Dakota. 29.4 psf is North Dakota's typical county figure - Williams County comes in 8.4 psf under it.
Near 48.3558°N 103.5013°W, FIPS 38105: Williams County counts 40,763 residents and a 30 psf map value, which the code's own factors turn into 21 psf.
How much it actually snows in Williams County
Most winters bring Williams County roughly 48.2 in. of snow - NOAA's normal at WILLISTON SLOULIN INTL AP, ND US, 14 mi off. (fresh vs. packed vs. ice explains why.)
Read this before you rely on it
Williams 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 Williams County's county-wide figure. Details: the calculation guide.