Vigo County, IN Roof Snow Load - 20 psf
What ASCE 7 says about snow load in Vigo County
That's Vigo County's design roof snow load per ASCE 7-22, for a typical heated single-family home - the number a permit reviewer starts from. Flat and low-pitch roofs in Vigo County are actually governed by ASCE 7's §7.3.4 minimum of 20 psf, not the 14 psf the ground-load formula alone would produce.
Converted to something you can actually eyeball on a roof: about 44 in. of fresh powder, 16 in. once it settles and packs down, or just 4 in. if it's turned to ice. 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.
Vigo County in numbers
- Design roof snow load20 psf
- Ground snow load, ASCE 7 map20 psf
- National rank#647 of 2,758
- Indiana rank#12 of 89
- Population106,166
- Annual snowfall, NOAA normal15.1 in.
- FIPS18167
Where Vigo County's figure sits nationally
Out of 2,758 rated US counties, Vigo County sits at #647, the top 23% nationally - #12 of 89 within Indiana. That's 0.7 psf above Indiana's own county-average design load of 19.3 psf.
Near 39.4309°N 87.391°W, FIPS 18167: Vigo County counts 106,166 residents and a 20 psf map value, which the code's own factors turn into 20 psf.
How much it actually snows in Vigo County
Most winters bring Vigo County roughly 15.1 in. of snow - NOAA's normal at FARMERSBURG TV-2, IN US, 13 mi off. (fresh vs. packed vs. ice explains why.)
Read this before you rely on it
Vigo County's number above is ASCE 7-22's default case, not a custom calculation: ordinary residential occupancy, heated, sited on ground that's neither fully sheltered nor fully exposed. Any one of those changing - pitch, exposure, heating, occupancy - moves the real figure.
Nothing here substitutes for an address-level number. Get one free, in about a minute, from the ASCE 7 Hazard Tool using your own coordinates rather than Vigo County's county-wide figure. (How this figure is calculated.)