Stanley County, SD Roof Snow Load - 24.5 psf
Stanley County, SD roof snow load, translated
A typical heated home in Stanley 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. 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.
Stanley County in numbers
- Design roof snow load24.5 psf
- Ground snow load, ASCE 7 map35 psf
- National rank#369 of 2,758
- South Dakota rank#51 of 65
- Population3,015
- Annual snowfall, NOAA normal31.3 in.
- FIPS46117
Where Stanley County ranks
#51 of 65 South Dakota counties by design load, top 13% of 2,758 nationally - that's Stanley County's spot. 28.2 psf is South Dakota's typical county figure - Stanley County comes in 3.7 psf under it.
FIPS 46117, population 3,015, centered near 44.414°N 100.7478°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.
Stanley County: average annual snowfall
Stanley County sees about 31.3 in. of snow most winters, per the FT PIERRE 17 WSW, SD US station's 1991-2020 NOAA normal. See the density guide.
Read this before you use Stanley 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.)