Des Moines River

About

Des Moines River, Minnesota Iowa — 1846 Fort Des Moines, 1857 Capital, 1977 Saylorville Lake 5,950 ac 525-mi. The river's character is set at Lake Shetek, where it collects at 1,483 feet and turns south and east across open prairie in Murray County. From there it drops through Cottonwood and Jackson counties before crossing into Iowa, and its full course covers 525 miles to the confluence with the Mississippi near Keokuk. The watershed it drains is large out of proportion to its gentle gradient — 14,802 square miles spanning Minnesota, Iowa, and Missouri — which is why USGS gauge 05476590 registers an average of roughly 1,069 CFS even on a river the state classifies as Class I.

Long before survey lines divided the drainage, the Des Moines ran through the ancestral territory of the Dakota — including the Mdewakanton, Wahpekute, Sisseton, and Wahpeton bands — as well as the Anishinaabe and the Ho-Chunk. The river served as a travel corridor, a fishing ground, and a gathering place. The framework of cession and treaty rights that followed was built through the 1837 Treaty of St. Peters, the 1842 Treaty of La Pointe, and the 1851 Treaties of Traverse des Sioux and Mendota, with the conflicts of 1863 to 1868 marking a violent turning point in that history. Farther downstream in Iowa, the Ioway, Otoe, and related Missouria migrated into the region from the Green Bay, Wisconsin area during the transition into historic times.

The river's most consequential chapter arrived in May 1846, when Fort Des Moines became the county seat of Polk County. The county was originally divided into four townships — Des Moines, Madison, Camp, and Skunk — and the frontier post anchored the settlement that would grow along the riverbanks. In 1857 the city of Des Moines was named Iowa's capital, cementing the modern era and turning a frontier fort into the state's seat of government.

The twentieth century reshaped the river with engineering rather than settlement. In 1977 the Army Corps completed Saylorville Lake, a 5,950-acre flood-control reservoir on the Iowa reach, one of the largest single interventions in the basin's flow. Downstream, the Des Moines Water Works — one of the largest water utilities in the Midwest — draws on the river, and decades of agricultural runoff have made water quality a persistent concern along the corridor.

That concern drives the river's present-day story. Since 2010 the Minnesota Pollution Control Agency and Minnesota DNR, working with watershed partnerships, have addressed more than a century of agricultural and industrial impacts through streambank stabilization, native fish restocking that includes walleye and lake sturgeon, and Clean Water Fund projects. For anglers, the payoff shows in the fishery: the Des Moines is a well-known catfish and walleye destination. For paddlers, the state has formalized public access through the Des Moines River State Water Trail, which offers a Class I run through prairie country from the Lake Shetek headwaters onward — moderate, navigable water for most of the season within the 525-to-1,600 CFS window.