The Mormon Flat Breastworks, fortification structures listed on the National Register of Historic Places

National Register of Historic Places listings in Morgan County, Utah

This is a list of the National Register of Historic Places listings in Morgan County, Utah.This is intended to be a complete list of the properties and districts on the National Register of Historic Places in Morgan County, Utah, United States...

, are located in Porterville. They consist of horizontal rock breastworks

Breastwork (fortification)

A breastwork is a fortification. The term is usually applied to temporary fortifications, often an earthwork thrown up to breast height to provide protection to defenders firing over it from a standing position...

 built by Mormon

Mormon

The term Mormon most commonly denotes an adherent, practitioner, follower, or constituent of Mormonism, which is the largest branch of the Latter Day Saint movement in restorationist Christianity...

s in 1857 to defend against "Johnston's Army"

Utah War

The Utah War, also known as the Utah Expedition, Buchanan's Blunder, the Mormon War, or the Mormon Rebellion was an armed confrontation between LDS settlers in the Utah Territory and the armed forces of the United States government. The confrontation lasted from May 1857 until July 1858...

 in the Utah War

Utah War

The Utah War, also known as the Utah Expedition, Buchanan's Blunder, the Mormon War, or the Mormon Rebellion was an armed confrontation between LDS settlers in the Utah Territory and the armed forces of the United States government. The confrontation lasted from May 1857 until July 1858...

. The walls were originally built about 4 feet (1.2 m) high, with trenches dug for riflemen

Rifleman

Although ultimately originating with the 16th century handgunners and the 17th century musketeers and streltsy, the term rifleman originated from the 18th century. It would later become the term for the archetypal common soldier.-History:...

. A dam

Dam

A dam is a barrier that impounds water or underground streams. Dams generally serve the primary purpose of retaining water, while other structures such as floodgates or levees are used to manage or prevent water flow into specific land regions. Hydropower and pumped-storage hydroelectricity are...

was also built on the nearby creek to force enemy soldiers to travel underneath them. These fortifications were not used in battle, and their exact location is restricted.