- Halfbreed Lake NWR is part of the Big Lake Complex, a large drainage area with Halfbreed being centrally located in the complex. The refuge receives the freshest water and most of the migratory bird use.
It was initally managed as a flowage and no-hunting refuge easement. In 1987, 3,246 acres were purchased in fee title which included most of the original easement. The refuge now includes 3,246 acres in fee title, 640 acres of state land, where FWS has acquired the grazing lease and 400 acres of private land that is still covered by the original refuge easement.
It is managed as part of the Charles M. Russell National Wildlife Refuge Complex located in Lewistown, Montana.
Halfbreed Lake NWR is located six miles east of Rapelje, Montana.