Mississippi County, MO Roof Snow Load - 15 psf
Mississippi County, MO: your roof's ASCE 7 snow number, in plain English
Mississippi County's roofs are built to hold 15 psf of snow, the ASCE 7-22 figure a permit reviewer checks first. ASCE 7's low-slope-roof minimum (§7.3.4) raises the governing figure to 15 psf - higher than the 10.5 psf the ground-load formula alone would give, and the code says use the larger one.
In depth, not weight: that's roughly 33 inches of fresh, light snow, 12 inches of old, settled snow, or as little as 3 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. 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.
Got real snow on a Mississippi County roof right now?
Mississippi County at a glance
- Design roof snow load15 psf
- Ground snow load, ASCE 7 map15 psf
- National rank#1,537 of 2,758
- Missouri rank#103 of 115
- Population11,750
- Annual snowfall, NOAA normal3.1 in.
- FIPS29133
Mississippi County by the numbers
Nationally that's #1,537 out of 2,758 rated counties, the top 56%; within Missouri alone, Mississippi County ranks #103 of 115. 18.6 psf is Missouri's typical county figure - Mississippi County comes in 3.6 psf under it.
Mississippi County, FIPS 29133, is home to 11,750 people near 36.8263°N 89.2959°W. Its 15 psf ground snow load figure is the map value; 15 psf is what a roof is actually designed for.
Mississippi County's snowfall, most winters
3.1 in. a year: that's Mississippi County's NOAA 1991-2020 snowfall normal, measured at SIKESTON PWR STN, MO US (18.4 mi away). See the density guide.
Before you rely on Mississippi County's number
Treat the Mississippi 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.)