Trempealeau County, WI Roof Snow Load - 35 psf
Trempealeau County, WI: your roof's ASCE 7 snow number, in plain English
Trempealeau 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 load this size is a serious structural matter; pre-modern-code homes and low-slope or flat-roofed sections are the ones most worth an inspection.
Trempealeau County in numbers
- Design roof snow load35 psf
- Ground snow load, ASCE 7 map50 psf
- National rank#143 of 2,758
- Wisconsin rank#30 of 72
- Population30,801
- Annual snowfall, NOAA normal42.4 in.
- FIPS55121
Trempealeau County by the numbers
Nationally that's #143 out of 2,758 rated counties, the top 5%; within Wisconsin alone, Trempealeau County ranks #30 of 72. Wisconsin counties average 30.9 psf; Trempealeau County runs 4.1 psf higher than that.
Trempealeau County, FIPS 55121, is home to 30,801 people near 44.303°N 91.3589°W. Its 50 psf ground snow load figure is the map value; 35 psf is what a roof is actually designed for.
Trempealeau County's snowfall, most winters
42.4 in. a year: that's Trempealeau County's NOAA 1991-2020 snowfall normal, measured at DODGE, WI US (15.1 mi away). See the density guide.
Before you rely on Trempealeau County's number
Treat the Trempealeau 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. See the methodology guide.