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Alton Confederate Prison

Alton Military Prison Site
Alton Military Prison remains.jpg
Overview of the site
Alton Military Prison is located in Illinois
Alton Military Prison
Alton Military Prison is located in the US
Alton Military Prison
Location Inside the block bounded by Broadway and William, 4th, and Mill Sts.
Coordinates 38°53′30″N 90°11′26″W / 38.89167°N 90.19056°W / 38.89167; -90.19056Coordinates: 38°53′30″N 90°11′26″W / 38.89167°N 90.19056°W / 38.89167; -90.19056
Area 4 acres (1.6 ha)
Built 1833 (1833)
NRHP Reference # 74000766
Added to NRHP December 31, 1974

The Alton Military Prison was a prison located in Alton, Illinois. The prison opened in 1833 as the Illinois State Prison and originally held 24 cells. By 1857, when it was replaced by a new state prison in Joliet, the prison housed 256 cells. In 1862, the U.S. government reopened the prison to house Confederate prisoners of war during the Civil War. The prison housed over 11,000 prisoners during the war. Deaths at the prison were more common than at other Union prisons, and prisoners faced harsh conditions and regular outbreaks of diseases such as smallpox and rubella. 1,534 Confederate soldiers and many Union soldiers and civilians are known to have died at the prison.

The prison closed in 1865 and was later demolished; all that remains of the structure is a section of a wall. The site of the prison was added to the National Register of Historic Places on December 31, 1974. It is also part of the Christian Hill Historic District, which was listed on the National Register in 1978.



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