Heart River

About

Mandan Matootonha Village, Heart River — Lewis & Clark 1804. Long before any survey party recorded it, the Heart was Mandan country. At the confluence of the Heart and Missouri stood On-A-Slant, known in Mandan as Miti-Ba-Rush, a major village of more than 1,000 people that thrived from the 1500s until about 1781, when a devastating smallpox epidemic forced its abandonment. The Mandan, together with the Hidatsa and Arikara — the Three Affiliated Tribes — farmed the fertile bottomlands where the two rivers meet. When the Lewis and Clark Expedition passed on October 19, 1804, it noted the Mandan village of Matootonha on the river's banks, a people already rooted at the confluence for more than two centuries.

The nineteenth century brought conflict to the valley. In 1863, a Pacific Wagon Road survey party was attacked along the Heart by Sioux. The following summer sharpened the tension: on July 19, 1864, General Alfred Sully marched his expedition away from Fort Rice, leaving behind a wagon train of immigrants at the Heart River for their own protection. Anxious and exposed on the open prairie, those travelers dug rifle pits into the earth to defend themselves. The remnants of those hasty fortifications still mark the ground twenty miles southeast of Richardton, in Stark County.

A decade later the river's mouth became a military post of national consequence. Lieutenant Colonel George Custer commanded Fort Abraham Lincoln, at the Heart's confluence with the Missouri, from 1873 until his departure in 1876. The fort served as the staging point for Custer's Black Hills Expedition and, finally, for the Seventh Cavalry campaign that ended at the Little Bighorn. Today that ground is preserved as Fort Abraham Lincoln State Park, the corridor that anchors the lower river's public identity.

The Heart watershed also passed through an industrial chapter. From the 1830s through the 1920s the basin was logged to feed the regional timber industry and the railroad expansion of the era, worked by local sawmills, logging drives, and downstream lumber operations. That large-scale cutting wound down with the exhaustion of old-growth stands in 1910, the start of state forestry conservation in 1915, and the establishment of state forests in the 1930s. In 1950 the river itself was dammed to create Lake Tschida, reshaping its flow regime.

For paddlers and anglers, the modern Heart offers two distinct characters. The reach below Dickinson Dam runs about 40 miles as a reliable tailwater and the best paddling on the river. Downstream, the 60-mile run from Glen Ullin to Mandan is a classic prairie river, threading cottonwood galleries as it eases toward the Missouri. Since 2010, regional agencies working with local watershed partnerships have addressed more than a century of logging, agricultural, and industrial impacts — streambank stabilization from 2015 to 2024, native fish restocking beginning in 2017, and nutrient-reduction and water-quality work through 2024. The Heart traces the same patient course it always has, a quiet Class I waterway carrying the memory of the Mandan, the wagon train, and the cavalry through the center of North Dakota before it surrenders at last to the Missouri.