Fort Harmony was an early Mormon pioneer settlement and adobe fort in Harmony Valley, on the northern edge of Washington County, Utah (near present-day New Harmony and Interstate 15 Exit 42). It existed primarily from 1854 to 1862 and is now a ghost town site listed on the National Register of Historic Places.
Early Exploration and Initial Settlement (1849–1853)
After Mormon pioneers arrived in the Salt Lake Valley in 1847, exploring parties assessed southern Utah’s resources, including potential iron deposits. In late 1849, a party led by Parley P. Pratt explored the region and identified promising areas. John D. Lee, a prominent early settler and member of the Church’s Council of Fifty, played a key role in southern colonization efforts aimed at supporting an anticipated iron industry and establishing agricultural outposts.
In December 1852 (some accounts reference early 1853 activity), a small group including John D. Lee and Elisha H. Groves established an initial settlement called Harmony along Ash Creek (near the site of today’s Ash Creek Reservoir). They built a wooden fort with a few houses. The name honored Harmony, Pennsylvania, associated with the translation of the Book of Mormon. This site proved inadequate—too small, too close to the river (flood risk), and distant from sufficient farmland—so it was largely abandoned.
Washington County was created by the Utah Territorial Legislature in March 1852, with the Harmony area designated as the county seat (though permanent structures came later). The settlement also became linked to the Church of Jesus Christ of Latter-day Saints’ Southern Indian Mission (sometimes called the mission to the Lamanites), focused on relations with Southern Paiute and other Native peoples. Missionaries taught farming and other skills while seeking conversions.
Construction of Fort Harmony (1854–1855)
In 1854, Brigham Young visited and directed relocation about four miles north to a better site in the middle of the valley. On or around May 9–20, 1854 (sources vary slightly; diaries such as T.D. Brown’s support May 20), Young personally turned the first sod for the southeast corner. Construction proceeded under John D. Lee’s supervision (with input from others, including possibly Truman O. Angell on design aspects) and was largely completed by February 1855.
It was the first fort in the Utah Territory built primarily of adobe brick (following Spanish-influenced suggestions), set on stone footings roughly 3 feet thick. Dimensions are reported variously as about 200 feet or 300 feet square (contemporary accounts and markers lean toward 200–300 feet). Walls were thick (outer walls around 3 feet; interior partitions thinner). The east side had one-story houses against a lower wall (about 10–11 feet high); the west side had two-story houses against a taller wall (about 16 feet high) for better oversight. Gates stood on the north and south sides. A deep well (reports of 86–100 feet) provided culinary water in the center; irrigation came from Kanarra and Harmony Creeks. Corrals for animals were to the south. Houses backed against the walls for defense and efficiency.
The fort housed dozens of families (estimates of population in the hundreds over time, with one mid-1850s report noting about 40 families and 260 people). It served as a hub for colonization south of the Great Basin, a way station for travelers on routes toward California (feeding and sheltering many), headquarters for the Southern Indian Mission, and the Washington County seat from 1856 until 1859 (when the seat shifted as other settlements grew). John D. Lee held local offices including probate judge, clerk, and assessor. Agriculture focused on wheat and other crops; an Indian farm was also established nearby.
Life at the Fort and Broader Context (1855–1861)
Daily life centered on farming, missionary work with local Native groups, community governance, religious activities, and defense preparations amid frontier conditions and the Utah War tensions of 1857. The fort was a key outpost for the Iron Mission region and a resting place for thousands of travelers.
John D. Lee lived there with family members during this period. In September 1857, the Mountain Meadows Massacre occurred roughly 35–40 miles away, in which a wagon train of emigrants (primarily from Arkansas) was attacked, resulting in the deaths of about 120 people. Local militia and some Native allies were involved; Lee was later the only person convicted and executed for his role (in 1877). The fort itself was not the massacre site, but it was Lee’s residence at the time and part of the regional context of high tensions.
An earthquake in 1860 cracked some walls, requiring repairs. Overall, the settlement was a productive agricultural and missionary center for several years.
Destruction and Abandonment (Winter 1861–1862)
The Great Flood of 1862 (part of a broader regional storm event that devastated other southern Utah settlements) brought nearly continuous heavy rain and snow for about 28 days in January–February 1862. The adobe bricks—made without sufficient binding materials such as straw or horsehair—dissolved and crumbled. Walls and buildings collapsed progressively. Families moved into wagons for safety.
By mid-to-late January, most residents had left. On or around February 7, 1862, while John D. Lee’s wife Sarah and some children remained, a gust of wind toppled a wall that crashed through to the lower floor, killing two of their young children: George Albert (about age 6) and Margarett Ann (about age 5). The fort was fully abandoned shortly thereafter (around mid-to-late February). It was never rebuilt.
Survivors relocated: many moved a short distance west to higher ground and founded New Harmony (the modern town); others went east/north to establish Kanarraville (in what is now Iron County). These towns share founding connections and family names from the fort era. New Harmony later developed its own infrastructure (including a schoolhouse by 1863).
Aftermath and the Site Today
The site passed into private hands (including the Schmutz family) and was used for ranching/agriculture. In 1936, the Utah Pioneer Trails and Landmarks Association (with local stake members) erected corner markers of stacked rock/concrete and a monument. The Daughters of Utah Pioneers also placed a marker. The Fort Harmony Site was listed on the National Register of Historic Places on November 16, 1979 (reference #79003493). In 2006, land was donated to Washington County with stipulations for protection; limited archaeological work has uncovered foundations, artifacts (pottery, nails, household items, etc.), and features such as rooms and ovens.
Today, little remains above ground beyond foundation traces (visible in places amid sagebrush), the 1930s corner markers, monuments, and interpretive signs. The site lies near the New Harmony Branch of the Washington County Library, just off the road from I-15 Exit 42 toward New Harmony, with views toward the Kolob Canyons section of Zion National Park. It is a quiet historic landmark rather than a developed tourist attraction, preserving the story of early southern Utah colonization, the challenges of adobe construction in a harsh climate, and the transition to lasting towns like New Harmony.
Sources for this account include contemporary diaries and records, National Register documentation, local historical society materials (e.g., Washington County Historical Society), and secondary historical summaries. Minor discrepancies exist in exact measurements, founding dates, and details across accounts, which is typical for 19th-century frontier records.