Wibaux County, MT Roof Snow Load - 21 psf
Wibaux County, MT: your roof's ASCE 7 snow number, in plain English
Wibaux County's roofs are built to hold 21 psf of snow, the ASCE 7-22 figure a permit reviewer checks first.
In depth, not weight: that's roughly 46.2 inches of fresh, light snow, 16.8 inches of old, settled snow, or as little as 4.2 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.
Wibaux County at a glance
- Design roof snow load21 psf
- Ground snow load, ASCE 7 map30 psf
- National rank#493 of 2,758
- Montana rank#7 of 29
- Population911
- Annual snowfall, NOAA normal38 in.
- FIPS30109
Wibaux County by the numbers
Nationally that's #493 out of 2,758 rated counties, the top 18%; within Montana alone, Wibaux County ranks #7 of 29. That's 2 psf above Montana's own county-average design load of 19 psf.
Wibaux County, FIPS 30109, is home to 911 people near 46.963°N 104.2745°W. Its 30 psf ground snow load figure is the map value; 21 psf is what a roof is actually designed for.
Wibaux County's snowfall, most winters
38 in. a year: that's Wibaux County's NOAA 1991-2020 snowfall normal, measured at WIBAUX 2 E, MT US (5.8 mi away). See the density guide.
Before you rely on Wibaux County's number
Treat the Wibaux 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.