The Cove Palisades State Park, State park with three rivers junction in Oregon, US.

The Cove Palisades State Park covers 1,781 hectares along the Deschutes and Crooked River arms of Lake Billy Chinook, 24 km southwest of Madras. The three-armed reservoir fills a canyon walled by vertical basalt columns, with nearly 116 km of shoreline and a depth of up to 120 m. A band of Bimrock basalt is visible at the top of the cliffs.

In 1878 settler Clark Green Rogers named a bathing spot on the Crooked River "The Cove". Oregon acquired the land in 1940 and established The Cove State Park with a tent campground; further donations and purchases enlarged it until 1977, when it gained the suffix Palisades for the canyon's palisade-like basalt columns. Construction of Round Butte Dam, completed in 1964, flooded the original park grounds, so today's areas sit on the plateau above the canyon.

The park's name comes from a bathing spot in the Crooked River that settler Clark Green Rogers called "The Cove" in 1878; "Palisades" was added for the palisade-like basalt columns of the canyon. The Confederated Tribes of Warm Springs named Lake Billy Chinook after the Wasco guide who led John C. Frémont and Kit Carson in 1843 and 1844. Near the group campground stands Ship Rock, a basalt block carved with prehistoric petroglyphs that was moved to its present spot when the reservoir was built.

The park operates year-round, though water-based activities and most facilities operate seasonally during warmer months. Visitors should plan their trip around seasonal closures and check conditions before arriving, especially for camping and boat access.

The Island, a 200-acre plateau ringed by the Crooked and Deschutes river arms, looks like an island but is a peninsula cut off by high, sheer cliffs. It was designated a research natural area in 1986 and closed to nearly all public access in 1997, keeping one of the last pre-settlement ecology remnants in the western United States.