Lorenzo Sitgreaves

Lorenzo Sitgreaves (February 15, 1810 – May 14, 1881) was a U. S. Army officer from Pennsylvania who led the 1851 Sitgreaves Expedition down the Zuñi and Colorado rivers.

Lorenzo Sitgreaves was born on February 15, 1810, in Easton, Pennsylvania, the son of Samuel Sitgreaves. He was a cadet at the United States Military Academy, West Point, New York, from July 1, 1827, to July 1, 1832, when he graduated 25th in his class of 45. He was appointed Brevet 2nd Lieutenant of the 1st Regiment of Artillery, July 1, 1832. He served on the Black Hawk Expedition of 1832, but not at the seat of war. Later that year he served in the garrison at the Bellona Arsenal in Chesterfield County, Virginia, and from 1832 to 1833 in a garrison in the Creek Nation, until he was promoted Second Lieutenant, 1st Artillery, September 30, 1833. Transferred, he served in garrison at Fort Monroe, Virginia, in 1833-34, then from 1834-36 again in the Creek Nation, until he resigned his commission on August 31, 1836. From 1836 to 1838, he was a civil engineer.

Sitgreaves was again appointed a 2nd Lieutenant in the Corps of Topographical Engineers on July 7, 1838. As Assistant Topographic Engineer he served in the construction of roads in Wisconsin from 1839‑40, and on a survey of Sault St. Marie, 1840-41 during which he was promoted to 1st Lieutenant, Corps of Topographic Engineers, July 18, 1840. He then served as an Assistant Topographic Engineer in surveying the U.S. border with Texas in 1841 and near New Orleans in 1841-42. In 1842-43 he served as an assistant in the Topographical Bureau in Washington, D.C. Returning to the field from 1843–44, he was Assistant Topographic Engineer in the improvement of the Hudson River, and in the 1844-45 survey of the harbor of Portsmouth, New Hampshire, and of the reefs of Florida in 1845-46.

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