Harrison County, IN Roof Snow Load - 15 psf
Harrison County, IN: your roof's ASCE 7 snow number, in plain English
Harrison County's roofs are built to hold 15 psf of snow, the ASCE 7-22 figure a permit reviewer checks first. 10.5 psf is what the ground-load formula alone gives; Harrison County's 15 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 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.
Harrison County, IN: quick facts
- Design roof snow load15 psf
- Ground snow load, ASCE 7 map15 psf
- National rank#1,398 of 2,758
- Indiana rank#82 of 89
- Population39,978
- Annual snowfall, NOAA normal4.3 in.
- FIPS18061
Harrison County by the numbers
Nationally that's #1,398 out of 2,758 rated counties, the top 51%; within Indiana alone, Harrison County ranks #82 of 89. Indiana counties average 19.3 psf; Harrison County runs 4.3 psf lower than that.
Harrison County, FIPS 18061, is home to 39,978 people near 38.1865°N 86.1038°W. Its 15 psf ground snow load figure is the map value; 15 psf is what a roof is actually designed for.
Harrison County's snowfall, most winters
4.3 in. a year: that's Harrison County's NOAA 1991-2020 snowfall normal, measured at LOUISVILLE MCALPINE, KY US (18.1 mi away). See the density guide.
Before you rely on Harrison County's number
Treat the Harrison 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.