ZIP Code 99359
Columbia County, Washington — Starbuck
What This Means
Columbia 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 | 99359 |
| County | Columbia |
| City | Starbuck |
| 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.
Columbia 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 99359?
ZIP code 99359 is in Columbia 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 99359?
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 99359 in?
ZIP code 99359 is in Columbia County, Washington (WA).