Brantley Lake State Park, State park on Pecos River in Eddy County, US.

Brantley Lake State Park is a New Mexico state park 12 miles north of Carlsbad, centered on a man-made reservoir created when Brantley Dam was built across the Pecos River in the 1980s. The lake, New Mexico's southernmost, covers about 4,000 acres, a surface that shifts with the Pecos's inconsistent flow and the arid climate. The park has 51 developed campsites with electricity, showers, a playground and a visitor center.

The park was established in 1989 when Brantley Dam was built to replace an older structure that no longer met safety standards. This dam project shaped how water has been managed in the region ever since.

The lake is stocked with bass, white bass, walleye, catfish, bluegill, carp and crappie, which made it a fishing destination. A 2005 study found high DDT levels and the State Parks Department advised against eating the catch; that catch-and-release policy was rescinded in 2018.

The park lies about 12 miles (19 km) north of Carlsbad, with 51 developed campsites that have electricity, plus showers, a playground and a visitor center. Lake surface area shifts with the Pecos River's inconsistent flow and the arid climate, so check conditions before launching a boat.

The lake is the southernmost in New Mexico, and its surface area of roughly 4,000 acres shifts with the inconsistent flow of the Pecos River and the arid climate. After high DDT levels were found in a 2005 study, the state recommended not eating the fish; that catch-and-release policy was rescinded in 2018.