Thaddeus was born in Gardiner, Maine on May 1, 1827. His parents were Michael Hildreth (born May 8, 1799 - died Oct. 29 1868) & Patience Hildreth (Knox) (born Jan. 12, 1797 - died May1, 1873)
He had 3 older siblings, William, Nancy & Benjamin, and 6 younger siblings, George, Michael, Patience, Hannah, Frances & Osgood.
The Hildreth party arrived in California November 27, 1849 aboard the steamship Oregon.
March 27, 1850, Thaddeus Hildreth, George A. Hildreth,* with John Walker, William "Billy" Jones (of New York) and Alexander Carson were the first miners to claim area that was first called Hildreth Diggins due to a rich strike of gold. As a result of their discovery in this New Diggins 6000 miners were soon building a town in this Dry Diggings (Placers Seco) and the final (fifth) name for this American Camp became Columbia. The Hildreth party also consisted of brother Michael S. Hildreth,** and two cousins Charles and Horace, who left no local history. In 1851 Thaddeus was on a committee that helped lay out the town streets and lots. As a result(?) a hill was named Kennebec and the stream south of town was called Maine Gulch. In 1854 Thaddeus was in a courtroom dispute over his potato garden. By 1855 he returned to Maine.
Back in Maine, he married Ann M. Seavey of Hallowell, Maine on August 18, 1855. (They had a son November 15,1865 and named him Willie Osgood.)
He enlisted in the 3rd Maine September 2, 1861 as an asst. Surgeon and was almost immediately promoted to Surgeon. He was in charge of the third corps hospital at Gettysburg for the months of July & August 1863. He was discharged with this unit on June 28, 1864.
Maine's archives on Civil War Soldiers' Cards show that he was Assistant Surgeon and then Surgeon in the 3rd Maine Infantry. He was commissioned on Sept. 2, 1861 and was mustered in the same day for a 3 year enlistment. At the time, he was a resident of Gardiner, Maine. He was mustered out and honorably discharged on June 28, 1864 in Augusta, Maine.
The Catalog of Bowdoin College, pg. 466, shows his as a non-graduate of the Medical School of Maine, Class of 1850. It says: Med. School 1849, 1855; M.D. Dartmouth 1856; born May 1, 1827 Gardiner, Maine; Residence, California 1849-1855. Surgeon 3rd Maine 1861-1864; Physician, Bath, Maine 1856-1858 and Gardiner, Maine 1858-1880. Died August 18, 1880.
He had a successful practice in Gardiner ME until the time of his death on August 18, 1880.
The following is the clipping from The Kennebec Daily Journal of August 19, 1880.
"A sad accident took place here yesterday, resulting in the death of one of our most esteemed physicians, Dr Thaddeus Hildreth. The Dr. was not in good health, and yesterday morning took what he supposed to be a dose of gentian, but which it appears was tincture of aconite root, a deadly poison. After taking the dose he got into his carriage and rode two or three miles, when feeling the effects of the poison he turned about and made for home, which he reached. He then had other physicians in the place immediately called in, but they could do nothing to relieve him and death soon ensued. He was about 55 years of age, and respected by everybody. His death is a great loss to the city."
His funeral was at 2:00 on August, 21st at the Episcopal church in Gardiner, and was attended by his comrades of the G.A.R. and the Masons. Six "brother" doctors were pall bearers. He is interred in Gardiner, ME. Next to his wife and son.