ZIP Code 99121
Ferry County, Washington — Danville
What This Means
Ferry County, Washington is designated as a Case Study area in ASCE 7-22. Ground snow loads in this region vary significantly due to elevation, terrain, or microclimate effects and cannot be determined from the standard maps. A site-specific case study by a licensed engineer using local weather data is required to determine the design snow load.
Snow Load Details
| ZIP Code | 99121 |
| County | Ferry |
| City | Danville |
| State | Washington (WA) |
| Ground Snow Load | N/A — Case Study |
| Classification Range | Case Study |
| Data Quality | Case study |
| Case Study | Yes — site-specific study required |
Source: ASCE 7-22 ground snow load polygons via ArcGIS
Ferry 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 99121?
ZIP code 99121 is in Ferry County, Washington, with a ground snow load of Case Study (varies), classified as case study per ASCE 7-22.
Is my roof strong enough for snow in 99121?
This area is a Case Study zone where snow loads vary significantly. A licensed structural engineer must determine the specific snow load for your site before any building or renovation.
What county is ZIP code 99121 in?
ZIP code 99121 is in Ferry County, Washington (WA).