According to : Selected Records of the War Department Relating to Confederate Prisoners of War, 1861-1865; (National Archives Microfilm Publication M598, 145 rolls); War Department Collection of Confederate Records, Record Group 109; National Archives, Washington, D.C.
Hiram Eldridge was captured on February 28, 1865 in Lee County, Virginia. He was sent to Camp Chase, Ohio on March 3, 1865 from by Louisville, Kentucky by way of Chattanooga, Tennessee, then Nashville, Tennessee. Eldridge died at Camp Chase General Hospital on June 21, 1865 from variola [smallpox]. Records indicate that he was buried "1/3 mile south of Camp Chase".
According to: Register of Confederate Soldiers, Sailors, and Citizens who Died in Federal Prisons and Military Hospitals in the North, 1861-1865; (National Archives Microfilm Publication M918, 1 roll); Records of the Office of the Quartermaster General, Record Group 92; National Archives, Washington, D.C.
Hiram Eldridge is buried in grave # 2049 at Camp Chase Confederate Cemetery, near Columbus, Ohio.