Antrim County, MI Roof Snow Load - 42 psf
Antrim County, MI: your roof's ASCE 7 snow number, in plain English
Antrim County's roofs are built to hold 42 psf of snow, the ASCE 7-22 figure a permit reviewer checks first.
In depth, not weight: that's roughly 92.4 inches of fresh, light snow, 33.6 inches of old, settled snow, or as little as 8.4 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 serious structural load - older homes built before modern snow-load provisions, or ones with low-slope or flat roof sections, are worth having checked.
Antrim County in numbers
- Design roof snow load42 psf
- Ground snow load, ASCE 7 map60 psf
- National rank#51 of 2,758
- Michigan rank#16 of 70
- Population24,536
- Annual snowfall, NOAA normal111.7 in.
- FIPS26009
Antrim County by the numbers
Nationally that's #51 out of 2,758 rated counties, the top 2%; within Michigan alone, Antrim County ranks #16 of 70. That's 10.3 psf above Michigan's own county-average design load of 31.7 psf.
Antrim County, FIPS 26009, is home to 24,536 people near 45.0055°N 85.1756°W. Its 60 psf ground snow load figure is the map value; 42 psf is what a roof is actually designed for.
Antrim County's snowfall, most winters
111.7 in. a year: that's Antrim County's NOAA 1991-2020 snowfall normal, measured at BOYNE FALLS, MI US (17 mi away). See the density guide.
Before you rely on Antrim County's number
Treat the Antrim 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. Details: the calculation guide.