Slope County, ND Roof Snow Load - 24.5 psf
Slope County, ND roof snow load, translated
A typical heated home in Slope County is designed to carry 24.5 pounds per square foot of snow on its roof, per ASCE 7-22.
On a roof that means 53.9 in. of fresh snow, 19.6 in. once it packs down, or 4.9 in. of solid ice - three very different piles for the same load. A meaningful design load. Most homes built to modern code handle it, but additions, carports, and flat-roofed sections are worth a second look.
Slope County, ND: quick facts
- Design roof snow load24.5 psf
- Ground snow load, ASCE 7 map35 psf
- National rank#378 of 2,758
- North Dakota rank#44 of 49
- Population660
- Annual snowfall, NOAA normal48.2 in.
- FIPS38087
Where Slope County ranks
#44 of 49 North Dakota counties by design load, top 14% of 2,758 nationally - that's Slope County's spot. North Dakota counties average 29.4 psf; Slope County runs 4.9 psf lower than that.
FIPS 38087, population 660, centered near 46.4458°N 103.4625°W. ASCE 7's underlying ground snow load here is 35 psf before the code's exposure and importance factors bring it to the 24.5 psf design figure above.
Slope County: average annual snowfall
Slope County sees about 48.2 in. of snow most winters, per the BOWMAN, ND US station's 1991-2020 NOAA normal. See the density guide.
Read this before you use Slope 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. (How this figure is calculated.)