Yankton County, SD Roof Snow Load - 24.5 psf
Yankton County, SD roof snow load, translated
A typical heated home in Yankton 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. 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.
Yankton County, SD: quick facts
- Design roof snow load24.5 psf
- Ground snow load, ASCE 7 map35 psf
- National rank#336 of 2,758
- South Dakota rank#46 of 65
- Population23,509
- Annual snowfall, NOAA normal39.2 in.
- FIPS46135
Where Yankton County ranks
#46 of 65 South Dakota counties by design load, top 12% of 2,758 nationally - that's Yankton County's spot. That's 3.7 psf below South Dakota's own county-average design load of 28.2 psf.
FIPS 46135, population 23,509, centered near 43.0066°N 97.3884°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.
Yankton County: average annual snowfall
Yankton County sees about 39.2 in. of snow most winters, per the MENNO, SD US station's 1991-2020 NOAA normal. See the density guide.
Read this before you use Yankton 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. Details: the calculation guide.