Ross Lake is a large

reservoir A reservoir (; ) is an enlarged lake behind a dam, usually built to water storage, store fresh water, often doubling for hydroelectric power generation. Reservoirs are created by controlling a watercourse that drains an existing body of wa ...

in the North Cascade mountains of northern

Washington Washington most commonly refers to: * George Washington (1732–1799), the first president of the United States * Washington (state), a state in the Pacific Northwest of the United States * Washington, D.C., the capital of the United States ** A ...

state,

United States The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic of 50 U.S. state, states and a federal capital district, Washington, D.C. The 48 ...

, and southwestern

British Columbia British Columbia is the westernmost Provinces and territories of Canada, province of Canada. Situated in the Pacific Northwest between the Pacific Ocean and the Rocky Mountains, the province has a diverse geography, with rugged landscapes that ...

Canada Canada is a country in North America. Its Provinces and territories of Canada, ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, making it the world's List of coun ...

. The

lake A lake is often a naturally occurring, relatively large and fixed body of water on or near the Earth's surface. It is localized in a basin or interconnected basins surrounded by dry land. Lakes lie completely on land and are separate from ...

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 1,604 feet above sea level (489 m). The U.S. portion of Ross Lake is in the

Ross Lake National Recreation Area Ross Lake National Recreation Area is a US national recreation area in north central Washington just south of the Canada–US border. It is the most accessible part of the North Cascades National Park Complex which also includes North Cascad ...

North Cascades National Park North Cascades National Park is a List of national parks of the United States, national park of the United States in Washington (state), Washington. At more than , it is the largest of the three National Park Service units that comprise the No ...

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 Skagit Valley Provincial Park is a provincial park in British Columbia, Canada, centred on the Skagit River and its tributaries. The park is 27,964 Hectares. The park borders E. C. Manning Provincial Park in Canada and Ross Lake National Recreat ...

, and Manning Provincial Park is nearby to the east.

Hydrology

Ross Lake is formed by the impoundment of the

Skagit River The Skagit River ( ) is a river in southwestern British Columbia in Canada and northwestern Washington (state), Washington in the United States, approximately 150 mi (240 km) long. The river and its tributaries drain an area of 1.7&nbs ...

Ross Dam Ross Dam is a -high, -long concrete thin arch dam across the Skagit River, forming Ross Lake. The dam is in Washington state, while Ross Lake extends north to British Columbia, Canada. Both dam and reservoir are located in Ross Lake National ...

, which is operated by

Seattle City Light Seattle City Light is the public utility providing electricity to Seattle, Washington, in the United States, and parts of its metropolitan area, including all of Shoreline, nearly all of Lake Forest Park, and parts of unincorporated King County, ...

for

hydroelectric power Hydroelectricity, or hydroelectric power, is Electricity generation, electricity generated from hydropower (water power). Hydropower supplies 15% of the world's electricity, almost 4,210 TWh in 2023, which is more than all other Renewable energ ...

generation serving

Seattle, Washington Seattle ( ) is the List of municipalities in Washington, most populous city in the U.S. state of Washington (state), Washington and in the Pacific Northwest region of North America. With a population of 780,995 in 2024, it is the List of Unit ...

, and surrounding areas. After leaving Ross Lake, the Skagit River flows through two more reservoirs before running to

Puget Sound Puget Sound ( ; ) is a complex estuary, estuarine system of interconnected Marine habitat, marine waterways and basins located on the northwest coast of the U.S. state of Washington (state), Washington. As a part of the Salish Sea, the sound ...

. High peaks surround Ross Lake in all directions, and include

Hozomeen Mountain Hozomeen Mountain is a double-summited rock peak on the east side of Ross Lake (Washington), Ross Lake in the North Cascades of Washington (state), Washington state. Despite its modest absolute elevation, it is notable for the large, steep dro ...

, Ruby Mountain, Desolation Peak, 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

, 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

glacier A glacier (; or ) is a persistent body of dense ice, a form of rock, that is constantly moving downhill under its own weight. A glacier forms where the accumulation of snow exceeds its ablation over many years, often centuries. It acquires ...

s and

snowfield A snow field, snowfield or neve is an accumulation of permanent snow and ice, typically found above the snow line, normally in mountainous and glacial terrain. Glaciers originate in snowfields. The lower end of a glacier is usually free from ...

s high in the North Cascades.

History

Ross Dam, originally called Ruby Dam, was built in three stages between 1937 and 1949, and currently stands 540 feet (160 m) tall. A fourth stage of construction was planned for the

dam A dam is a barrier that stops or restricts the flow of surface water or underground streams. Reservoirs created by dams not only suppress floods but also provide water for activities such as irrigation, human consumption, industrial use, aqua ...

; 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 The Skagit River Hydroelectric Project is a series of dams with hydroelectric power-generating stations on the Skagit River in the north of the U.S. state of Washington. The project is owned and operated by Seattle City Light to provide elect ...

, which built the dam.

Recreation

Ross Lake is a major recreation destination within the North Cascades, attracting visitors with a multitude of

fishing Fishing is the activity of trying to catch fish. Fish are often caught as wildlife from the natural environment (Freshwater ecosystem, freshwater or Marine ecosystem, marine), but may also be caught from Fish stocking, stocked Body of water, ...

canoe A canoe is a lightweight, narrow watercraft, water vessel, typically pointed at both ends and open on top, propelled by one or more seated or kneeling paddlers facing the direction of travel and using paddles. In British English, the term ' ...

ing,

kayaking Kayaking is the use of a kayak for moving over water. It is distinguished from canoeing by the sitting position of the paddler and the number of blades on the paddle. A kayak is a low-to-the-water, canoe-like boat in which the paddler sits fac ...

, and

hiking A hike is a long, vigorous walk, usually on trails or footpaths in the countryside. Walking for pleasure developed in Europe during the eighteenth century. Long hikes as part of a religious pilgrimage have existed for a much longer time. "Hi ...

opportunities. The

trout Trout (: trout) is a generic common name for numerous species of carnivorous freshwater ray-finned fishes belonging to the genera '' Oncorhynchus'', ''Salmo'' and ''Salvelinus'', all of which are members of the subfamily Salmoninae in the ...

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 fish. Camping is allowed at a number of boat-in and hike-in campsites around the lake. Backcountry camping permits (free, first-come, first-served) are required, and may be obtained from the

National Park Service The National Park Service (NPS) is an List of federal agencies in the United States, agency of the Federal government of the United States, United States federal government, within the US Department of the Interior. The service manages all List ...

Marblemount Marblemount is a census-designated place in Skagit County, Washington, United States. The population was 286 at the 2020 census. It is included in the Mount Vernon–Anacortes, Washington Metropolitan Statistical Area. History Present-day M ...

. The lake is also home to a floating resort called the Ross Lake Resort. Made up of a dozen cabins and 3 bunkhouses, it is situated approximately a quarter mile from the dam and rests entirely on log booms. During the winter, when lake levels shrink, the resort detaches from its shore moorings and relocates to the center of the lake. This is due to lower water levels caused by annual drawdowns of the lake for flood control of the Skagit River. A road from the Canadian side of the lake ends just inside the US. Travelers do not have to report to an official Port of Entry (as required at the nearby

Pacific Crest Trail The Pacific Crest Trail (PCT), officially designated as the Pacific Crest National Scenic Trail, is a long-distance hiking and equestrian trail closely aligned with the highest portion of the Cascade and Sierra Nevada mountain ranges, which lie ...

crossing), as they must reenter Canada to leave.

Climate

Ross Lake has a

mediterranean climate A Mediterranean climate ( ), also called a dry summer climate, described by Köppen and Trewartha as ''Cs'', is a temperate climate type that occurs in the lower mid-latitudes (normally 30 to 44 north and south latitude). Such climates typic ...

(

Köppen Köppen is a German surname. Notable people with the surname include: * Bernd Köppen (1951–2014), German pianist and composer * Carl Köppen (1833-1907), German military advisor in Meiji era Japan * Edlef Köppen (1893–1939), German author ...

''Csb'').

References

External links

*National Park Service website fo
Ross Lake National Recreation AreaChronology of Skagit River dams
from the Skagit Valley Herald

from Seattle Municipal Archives {{authority control Canada–United States border Canadian Cascades Lakes of the Lower Mainland International lakes of North America Lakes of British Columbia North Cascades of Washington (state)

Ross Ross may refer to: People and fictional characters * Ross (name), including a list of people and fictional characters with the surname or given name Ross, as well as the meaning * Clan Ross, a Highland Scottish clan Places Antarctica * Ross Sea ...