San Miguel County, NM Roof Snow Load - 10 psf
San Miguel County, NM roof snow load, translated
A typical heated home in San Miguel County is designed to carry 10 pounds per square foot of snow on its roof, per ASCE 7-22. The physics-based figure alone would be 7 psf, but ASCE 7's own low-slope minimum (§7.3.4) sets a floor of 10 psf for flat and low-pitch roofs here, which is the number that actually governs.
On a roof that means 22 in. of fresh snow, 8 in. once it packs down, or 2 in. of solid ice - three very different piles for the same load. This is a modest add-on to standard roof loading - ordinary residential construction carries it without extra bracing.
San Miguel County, NM: quick facts
- Design roof snow load10 psf
- Ground snow load, ASCE 7 map10 psf
- National rank#1,864 of 2,758
- New Mexico rank#5 of 27
- Population26,428
- Annual snowfall, NOAA normal22 in.
- FIPS35047
Where San Miguel County ranks
#5 of 27 New Mexico counties by design load, top 68% of 2,758 nationally - that's San Miguel County's spot. New Mexico counties average 6.9 psf; San Miguel County runs 3.1 psf higher than that.
FIPS 35047, population 26,428, centered near 35.4769°N 104.8035°W. ASCE 7's underlying ground snow load here is 10 psf before the code's exposure and importance factors bring it to the 10 psf design figure above.
San Miguel County: average annual snowfall
San Miguel County sees about 22 in. of snow most winters, per the LAS VEGAS WWTP, NM US station's 1991-2020 NOAA normal. See the density guide.
Read this before you use San Miguel County's figure
The figure above assumes the case ASCE 7-22 treats as typical: a heated, ordinary-occupancy home on a partially exposed site. Change any of those - exposure, heating, roof pitch, occupancy category - and the real design number moves.
A building permit needs the number at your exact address, not the county average - the free ASCE 7 Hazard Tool returns that from your coordinates in about a minute and produces a PDF a plan reviewer will accept. See the methodology guide.