ZIP Code 62905
Union County, Illinois — Alto Pass
What This Means
Union County, Illinois has a light ground snow load of 15 PSF per ASCE 7-22. At this level, most standard residential roofs are designed to handle the load without issue. However, flat or low-slope roofs should still be checked for drifting and sliding snow.
Snow Load Details
| ZIP Code | 62905 |
| County | Union |
| City | Alto Pass |
| State | Illinois (IL) |
| Ground Snow Load | 15 PSF — Light |
| Classification Range | 1 - 20 PSF |
| Data Quality | Measured |
Source: ASCE 7-22 ground snow load polygons via ArcGIS
Roof Snow Load Calculator
ASCE 7-22 flat roof formula: pf = 0.7 × Ce × Ct × Is × pg
Your ground snow load (pg): 15 PSF
ⓘ Simplified estimate for flat roofs. Sloped roofs, drift zones, and unbalanced loads need additional calculations. Consult a structural engineer for final design.
Union County Snow Load Map
Counties colored by snow load classification. Gray = No Load, Blue = Light, Amber = Moderate, Orange = Heavy, Red = Extreme, Purple = Case Study.
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Frequently Asked Questions
What is the ground snow load for ZIP code 62905?
ZIP code 62905 is in Union County, Illinois, with a ground snow load of 15 PSF, classified as light per ASCE 7-22.
Is my roof strong enough for snow in 62905?
With a light ground snow load of 15 PSF, standard residential construction typically handles this load, but verify with your local building code.
What county is ZIP code 62905 in?
ZIP code 62905 is in Union County, Illinois (IL).