New Madrid County, MO Roof Snow Load - 15 psf
What ASCE 7 says about snow load in New Madrid County
That's New Madrid 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 New Madrid County are actually governed by ASCE 7's §7.3.4 minimum of 15 psf, not the 10.5 psf the ground-load formula alone would produce.
Converted to something you can actually eyeball on a roof: about 33 in. of fresh powder, 12 in. once it settles and packs down, or just 3 in. if it's turned to ice. Modern-code homes carry a load like this without issue; an older addition, a carport, or any flat-roofed section is where it is worth checking first.
Already snow on the roof in New Madrid County?
New Madrid County at a glance
- Design roof snow load15 psf
- Ground snow load, ASCE 7 map15 psf
- National rank#1,504 of 2,758
- Missouri rank#100 of 115
- Population15,212
- Annual snowfall, NOAA normal6.6 in.
- FIPS29143
Where New Madrid County's figure sits nationally
Out of 2,758 rated US counties, New Madrid County sits at #1,504, the top 55% nationally - #100 of 115 within Missouri. That's 3.6 psf below Missouri's own county-average design load of 18.6 psf.
Near 36.5943°N 89.6559°W, FIPS 29143: New Madrid County counts 15,212 residents and a 15 psf map value, which the code's own factors turn into 15 psf.
How much it actually snows in New Madrid County
Most winters bring New Madrid County roughly 6.6 in. of snow - NOAA's normal at PORTAGEVILLE, MO US, 12.7 mi off. (fresh vs. packed vs. ice explains why.)
Read this before you rely on it
New Madrid 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 New Madrid County's county-wide figure. Details: the calculation guide.