ZIP Code 98222
San Juan County, Washington — Blakely Island
What This Means
San Juan County, Washington has a light ground snow load of 20 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 | 98222 |
| County | San Juan |
| City | Blakely Island |
| State | Washington (WA) |
| Ground Snow Load | 20 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): 20 PSF
ⓘ Simplified estimate for flat roofs. Sloped roofs, drift zones, and unbalanced loads need additional calculations. Consult a structural engineer for final design.
San Juan 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 98222?
ZIP code 98222 is in San Juan County, Washington, with a ground snow load of 20 PSF, classified as light per ASCE 7-22.
Is my roof strong enough for snow in 98222?
With a light ground snow load of 20 PSF, standard residential construction typically handles this load, but verify with your local building code.
What county is ZIP code 98222 in?
ZIP code 98222 is in San Juan County, Washington (WA).