Roosevelt County, MT Roof Snow Load - 21 psf

How much snow is too much for a roof in Roosevelt County, MT?

Picture it, not just weigh it: 46.2 in. if it's fresh powder, 16.8 in. once it settles, or a mere 4.2 in. if it's 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.

Roosevelt County, MT: quick facts

• Design roof snow load21 psf
• Ground snow load, ASCE 7 map30 psf
• National rank#469 of 2,758
• Montana rank#1 of 29
• Population10,197
• Annual snowfall, NOAA normal28.2 in.
• FIPS30085

How Roosevelt County compares

21 psf ranks #469 of 2,758 US counties with a mapped snow load (top 17%) - and #1 of 29 in Montana. That's 2 psf above Montana's own county-average design load of 19 psf.

Population 10,197 (FIPS 30085), roughly 48.2827°N 104.9952°W. The 30 psf ground snow load ASCE 7-22 maps here becomes 21 psf once the code's own design factors are applied.

Typical snowfall in Roosevelt County, MT

NOAA's 30-year normal for Roosevelt County: 28.2 in. of snow a year, from the BREDETTE, MT US station. (fresh vs. packed vs. ice explains why.)

What this Roosevelt County figure assumes

This is a county-level reference figure for a typical heated home built to Risk Category II (ordinary residential), on a partially exposed lot - the assumptions ASCE 7-22 itself treats as the default case. A steeper roof, a fully exposed hilltop lot, an unheated structure, or a higher risk category all change the actual number.

Roosevelt County's permit office wants an address-specific figure, not this county average - the ASCE 7 Hazard Tool is free, takes under a minute, and outputs a PDF most reviewers accept. (How this figure is calculated.)