Fort Armstrong, Military fort in Rock Island, Illinois, United States
Fort Armstrong occupied a strategic position on Rock Island, featuring three blockhouses and stone walls measuring 300 feet on each side along the Mississippi River.
Constructed in 1816 after the War of 1812, Fort Armstrong functioned as a military stronghold until 1836, protecting American settlers in the northwestern Illinois territory.
The location held deep meaning for the Sauk people who used the surrounding waters for fishing before the establishment of the military installation.
The fort site now stands within the Rock Island Arsenal complex, which continues to serve military purposes through manufacturing and logistical operations.
Fort Armstrong maintained detailed weather records from 1820 to 1836, creating the first official meteorological documentation in Illinois with three daily temperature measurements.
Location: Illinois
Inception: 1816
GPS coordinates: 41.51650,-90.56390
Latest update: March 21, 2025 12:48
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