Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
For public health or safety the use of explosives within the below described area is prohibited. (36 CFR 261.53)
Alert Start Date: June 8, 1979
Alert End Date: N/A
Order Number: 010
Contact Number: 605-673-9200
Last updated January 27, 2026
