Blue Mountain Lake is a roughly 2,900-acre flood-control reservoir on the Petit Jean River in Yell and Logan counties in west-central Arkansas. It was created when the U.S. Army Corps of Engineers completed Blue Mountain Dam in 1947 as part of a comprehensive plan for the Petit Jean and lower Arkansas River valleys. The project is operated primarily for flood risk management, with recreation and fish and wildlife benefits.

At normal pool the lake has about 54 miles of shoreline, averages only about 9 feet deep, and reaches near 30 feet close to the dam. Large seasonal pool swings flood lowland forest and buttonbush at high water and leave stump fields, laydowns, and rocky substrate at conservation pool, so habitat and navigable water change markedly with elevation.

Blue Mountain is a quieter Corps lake popular for camping, hunting, and fishing for largemouth bass, crappie, catfish, and bream, with fisheries managed by the Arkansas Game and Fish Commission. Corps parks such as Waveland, Ashley Creek, and Lick Creek provide boat ramps, camping, and shoreline access.

Water levels on Blue Mountain Lake are managed by the Corps of Engineers under a seasonal rule curve, with a summer conservation target near 387 feet NGVD29, a winter pool near 384 feet, and a flood-control pool extending to 419 feet. Because the lake is designed to store and release floodwater from the Petit Jean basin, elevations can rise quickly after heavy rain, so monitoring current lake levels is important for boating, fishing, and campground access. Sister flood-control project Nimrod Lake lies on the nearby Fourche La Fave River.

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