SnowLoadCheck

Peoria County, IL Roof Snow Load - 20 psf

Peoria County, IL: your roof's ASCE 7 snow number, in plain English

Moderate
20 psf

Peoria 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; Peoria 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.

Peoria County, IL: quick facts

Peoria County by the numbers

Nationally that's #595 out of 2,758 rated counties, the top 22%; within Illinois alone, Peoria County ranks #12 of 102. Illinois counties average 19.3 psf; Peoria County runs 0.7 psf higher than that.

Peoria County, FIPS 17143, is home to 179,630 people near 40.786°N 89.767°W. Its 20 psf ground snow load figure is the map value; 20 psf is what a roof is actually designed for.

Peoria County's snowfall, most winters

26.2 in. a year: that's Peoria County's NOAA 1991-2020 snowfall normal, measured at PEORIA GTR PEORIA AP, IL US (9.3 mi away). See the density guide.

Before you rely on Peoria County's number

Treat the Peoria 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.)