Carroll County, NH Roof Snow Load - 63 psf
Carroll County, NH: your roof's ASCE 7 snow number, in plain English
Carroll County's roofs are built to hold 63 psf of snow, the ASCE 7-22 figure a permit reviewer checks first.
In depth, not weight: that's roughly 138.6 inches of fresh, light snow, 50.4 inches of old, settled snow, or as little as 12.6 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. Among the highest mapped design loads in the country outside case-study terrain. Roof snow removal and periodic structural inspection are standard practice at this load.
Carroll County at a glance
- Design roof snow load63 psf
- Ground snow load, ASCE 7 map90 psf
- National rank#3 of 2,758
- New Hampshire rank#1 of 4
- Population52,580
- Annual snowfall, NOAA normal77.9 in.
- FIPS33003
Carroll County by the numbers
Nationally that's #3 out of 2,758 rated counties, the top 1%; within New Hampshire alone, Carroll County ranks #1 of 4. That's 12.2 psf above New Hampshire's own county-average design load of 50.8 psf.
Carroll County, FIPS 33003, is home to 52,580 people near 43.8678°N 71.2016°W. Its 90 psf ground snow load figure is the map value; 63 psf is what a roof is actually designed for.
Carroll County's snowfall, most winters
77.9 in. a year: that's Carroll County's NOAA 1991-2020 snowfall normal, measured at EAST HIRAM, ME US (22.3 mi away). See the density guide.
Before you rely on Carroll County's number
Treat the Carroll 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. (How this figure is calculated.)