SnowLoadCheck

Marshall County, SD Roof Snow Load - 35 psf

Marshall County, SD: your roof's ASCE 7 snow number, in plain English

Heavy
35 psf

Marshall County's roofs are built to hold 35 psf of snow, the ASCE 7-22 figure a permit reviewer checks first.

In depth, not weight: that's roughly 77 inches of fresh, light snow, 28 inches of old, settled snow, or as little as 7 inches of solid ice - snow that heavy is rare here but ice from a freeze-thaw cycle adds up far faster than the depth suggests. A serious structural load. Homes built before modern snow-load provisions, or with low-slope/flat roof sections, are the ones most worth having checked.

Got real snow on a Marshall County roof right now?

in. of

Marshall County in numbers

Marshall County by the numbers

Nationally that's #202 out of 2,758 rated counties, the top 7%; within South Dakota alone, Marshall County ranks #12 of 65. That's 6.8 psf above South Dakota's own county-average design load of 28.2 psf.

Marshall County, FIPS 46091, is home to 4,395 people near 45.737°N 97.5809°W. Its 50 psf ground snow load figure is the map value; 35 psf is what a roof is actually designed for.

Marshall County's snowfall, most winters

48.1 in. a year: that's Marshall County's NOAA 1991-2020 snowfall normal, measured at ROY LAKE, SD US (7.4 mi away). See the density guide.

Before you rely on Marshall County's number

Treat the Marshall County figure as a starting point, not a final answer: it assumes standard occupancy, a heated structure and a moderately sheltered site, per ASCE 7-22's own defaults. Exposed terrain, an unheated building or a steeper roof all shift the real number.

For a real application, skip the county number and go straight to the ASCE 7 Hazard Tool - enter your coordinates and it returns a site-specific figure a plan reviewer will recognize. (How this figure is calculated.)