- State: CO
- NPCA Region: Southwest
- Est. Date: 2007
Air & Climate Data
View the Polluted Parks ReportVisibility
Moderate Concern
Health
Significant Concern
Nature
Significant Concern
Climate
Significant Concern
Sand Creek Massacre National Historic Site memorializes the massacre of nearly 160 Cheyenne and Arapaho people on November 29, 1864.
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