MO DPO - Grand Pass - Full-date CDS and fancy cancel killer

Established during the peak of western expansion (1831 - 1849) to serve a settlement known for its freshwater springs, which made it a preferred halting point for travelers exiting the pass.

Second operational period (1888–1983): Re-established in the late 19th century and remained in operation for nearly a century before being permanently discontinued in 1983.