The lake and lands are managed under the Lake Roosevelt Cooperative Management Agreement dated April 5, 1990, succeeding an original 1946 agreement. Per the agreement, the management and regulations of Lake Roosevelt Management Area set out in the agreement are not intended to nor shall they interfere with or be inconsistent with the purposes for which the
Columbia Basin Project was established, is operated and maintained; those purposes being primarily
flood control, improved
navigation,
streamflow regulation, providing for storage and for the delivery of stored waters thereof for the reclamation of public and private lands and Indian reservations, for the generation of electrical power and for other beneficial uses, nor it is in intended to modify or alter any obligations or authority of the parties. The
National Park Service manages
Lake Roosevelt National Recreation Area. The NPS maintains visitor centers, boat-in campsites, shoreline camping, and conducts marine patrols for compliance with
United States Coast Guard marine safety rules. The
Bureau of Reclamation has two management zones. One is directly behind the dam. It follows the log boom line from the west bank of the river to about mid-channel. Then at the Grant and Okanogan county line (in the middle of the lake) the boundary goes uplake for a short distance until it cuts across to the east shoreline. The other zone is located on the east side of the lake at China Bar, . Reclamation operates a log collection facility. Reclamation captures logs and other large debris before it enters Lake Roosevelt.
Bureau of Indian Affairs indirectly manages parts of the lake that are along the
Colville Indian Reservation and
Spokane Reservation. Although some
Washington Department of Natural Resources lands abut against Lake Roosevelt National Recreation Area, the state's Discover Pass does not cover use of NPS boat launches or tribal lands and waters. ==Pollution litigation==