SnowLoadCheck

Lenawee County, MI Roof Snow Load - 20 psf

Lenawee County, MI: your roof's ASCE 7 snow number, in plain English

Moderate
20 psf

Lenawee County's roofs are built to hold 20 psf of snow, the ASCE 7-22 figure a permit reviewer checks first. 14 psf is what the ground-load formula alone gives; Lenawee County's 20 psf low-slope minimum (§7.3.4) beats it, so that figure is the one that governs on flat and low-pitch roofs.

In depth, not weight: that's roughly 44 inches of fresh, light snow, 16 inches of old, settled snow, or as little as 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. A meaningful design load. Most homes built to modern code handle it, but additions, carports, and flat-roofed sections are worth a second look.

Lenawee County, MI: quick facts

Lenawee County by the numbers

Nationally that's #656 out of 2,758 rated counties, the top 24%; within Michigan alone, Lenawee County ranks #66 of 70. That's 11.7 psf below Michigan's own county-average design load of 31.7 psf.

Lenawee County, FIPS 26091, is home to 97,746 people near 41.896°N 84.0744°W. Its 20 psf ground snow load figure is the map value; 20 psf is what a roof is actually designed for.

Lenawee County's snowfall, most winters

33.3 in. a year: that's Lenawee County's NOAA 1991-2020 snowfall normal, measured at HUDSON 3 E, MI US (11.8 mi away). See the density guide.

Before you rely on Lenawee County's number

Treat the Lenawee 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.)