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For the Minnesota Township, see Ross Lake Township, Minnesota.

Ross Lake
Ross Lake from Desolation Peak (looking south)
Coordinates	48°52′N 121°2′WCoordinates: 48°52′N 121°2′W
Lake type	reservoir
Basin countries	United States, Canada
Max length	23 mi (37 km)
Max width	1.5 mi (2.5 km)
Max depth	540 ft (165 m)
Surface elevation	1604 ft (489 m)
Settlements	none

Looking north up Ross Lake, with Hozomeen Mountain in the left-background and Desolation Peak in the center-background

Ross Dam, forming Ross Lake

Ross Lake is a large reservoir in the North Cascade mountains of northern Washington state, USA, and southwestern British Columbia, Canada. The lake runs approximately north-south, is 23 miles (37 km) long, up to 1.5 miles (2.5 km) wide, and the full reservoir elevation is 1604 feet above sea level (489 m).

The U.S. portion of Ross Lake is in the Ross Lake National Recreation Area. North Cascades National Park is adjacent to the west and south, while the Pasayten Wilderness is east of the lake. In British Columbia the lake is a part of Skagit Valley Provincial Park, and Manning Provincial Park is nearby to the east.

Ross Lake is formed by the impoundment of the Skagit River by Ross Dam, which is operated by Seattle City Light for hydroelectric power generation serving Seattle, Washington, and surrounding areas. After leaving Ross Lake, the Skagit River flows through two more reservoirs before running to Puget Sound.

High peaks surround Ross Lake in all directions, and include Hozomeen Mountain, Ruby Mountain, and Jack Mountain, the summit of which is over 7,000 feet above the elevation of the lake. Rivers and creeks flowing into Ross Lake include the upper Skagit River, Hozomeen Creek, Silver Creek, Little Beaver Creek, Arctic Creek, Lightning Creek, Devils Creek, Big Beaver Creek, and Ruby Creek. Most of these creeks originate from glaciers and snowfields high in the North Cascades.

• Cat Island
• Tenmile Island
• Little Jerusalem Island
• Cougar Island

Ross Dam, originally called Ruby Dam, was built in three stages between 1937 and 1949, and currently stands 540 feet (165 m) tall. A fourth stage of construction was planned for the dam; however, in 1984 Seattle City Light made an electricity-purchasing agreement with British Columbia which delayed any further expansion of the Ross Lake Dam for 80 years. The lake and dam are named after James D. Ross, the superintendent of the Seattle City Light’s Skagit River Hydroelectric Project, which built the dam.

Ross Lake is a major recreation destination within the North Cascades, attracting visitors with a multitude of fishing, canoeing, kayaking, and hiking opportunities. The trout fishing, in particular, is well-renowned. Ross Dam, as well as Gorge and Diablo dams downstream, are barriers preventing salmon from travelling between Ross Lake and the Pacific Ocean; thus, Ross Lake has no anadromous fishes.

Camping is allowed at a number of boat-in and hike-in campsites around the lake. Reservations are required, and may be obtained from the National Park Service in Marblemount.

• National Park Service website for Ross Lake National Recreation Area
• Chronology of Skagit River dams from the Skagit Valley Herald
• Upper Skagit Watershed Photograph Project from Seattle Municipal Archives

• Diablo Lake