The Leech Lake Reservation was not established in a single legislative act. Rather, it grew from the amalgamation of multiple treaties, executive orders, and various articles of legislation spanning many decades. The core areas of the reservation were established by
the 1855 treaty of Washington, which formed three smaller reservations for the
Pillager Band of Chippewa Indians at Leech Lake, Cass Lake, and Lake Winnibigoshish. These reservations were reshaped and consolidated by new treaties in 1864 and 1867, when the United States sought with little success to concentrate Ojibwes from other reservations together at a single location. The reservation was further modified by several
executive orders in the 1870s, one of which created the White Oak Point reservation of the
Mississippi Band. Under the
Dawes Act of 1887 and the
Nelson Act of 1889, the United States allotted tribal land on the Ojibwe reservations into private parcels. Some parcels were held by individual tribal members, but much of the reservation was alienated into the ownership of timber companies and white settlers. In addition, the United States established what became the
Chippewa National Forest in the early twentieth century on the remaining unallotted tribal land. As a result, by 1934, less than 5% of the reservation was still in Ojibwe ownership. Following the
Indian Reorganization Act of 1934, the present "Greater" Leech Lake Indian Reservation was formed from the administrative merger of the Leech Lake, Cass Lake, and Lake Winnibigoshish reservations of the Pillager Band, the Chippewa Indian Reservation of the
Lake Superior Band, and the White Oak Point reservation of the
Mississippi Band. Between 1948 and 1959, the U.S. Department of Interior continued to transfer thousands of acres of tribally owned reservation allotments at Leech Lake to the U.S. Department of Agriculture for incorporation into Chippewa National Forest. The Department of Interior discontinued these transfers in 1959 after finding that it had acted illegally by selling allotments without the consent of tribal landowners. In 2020, Congress passed legislation to return approximately 11,760 acres of this illegally taken land from the Chippewa National Forest back to the Leech Lake Reservation. The returned parcels regained trust status as part of the reservation in 2024. Even after the return of national forest land in 2024, the Leech Lake Band owns a smaller percentage of its reservation than any other Ojibwe nation in Minnesota. The returned land had constituted about 1.75% of the Chippewa National Forest, and about 40% of the national forest continues to occupy reservation land. ==Geography==