ZIP Code 57730
Custer County, South Dakota — Crazy Horse
What This Means
Custer County, South Dakota 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 | 57730 |
| County | Custer |
| City | Crazy Horse |
| State | South Dakota (SD) |
| 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.
Custer 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 57730?
ZIP code 57730 is in Custer County, South Dakota, with a ground snow load of 20 PSF, classified as light per ASCE 7-22.
Is my roof strong enough for snow in 57730?
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 57730 in?
ZIP code 57730 is in Custer County, South Dakota (SD).