Baker Lake, lake in Washington State, USA

Baker Lake is a reservoir in the Baker River valley of Whatcom County, Washington, within Mount Baker-Snoqualmie National Forest. It covers 4,800 acres and holds up to 285,000 acre-feet of water. The Upper Baker Dam, a concrete gravity structure, raised the lake 312 feet in 1959. The lake lies about 10 miles north of Concrete.

Baker Lake was originally a smaller natural body of water. In 1959, it was enlarged and its surface raised by 312 feet (95 m) with the construction of the Upper Baker Dam, a concrete gravity hydroelectric dam generating 91 megawatts. The lake now serves as a reservoir within Mount Baker National Recreation Area.

Water levels swing about 12 metres over the year, so shorelines and boat ramps shift with the season. Swift Creek Campground, about halfway up the lake opposite Park Creek, has 55 sites for tents or RVs, two group sites, a boat ramp and a marina. The lake lies roughly 16 km north of Concrete.