Downton Lake, originally Downton Reservoir, and also known as Downton Lake Reservoir, is a reservoir

Reservoir

A reservoir , artificial lake or dam is used to store water.Reservoirs may be created in river valleys by the construction of a dam or may be built by excavation in the ground or by conventional construction techniques such as brickwork or cast concrete.The term reservoir may also be used to...

 in the Bridge River Country

Bridge River Country

The Bridge River Country is a historic geographic region and mining district in the Interior of British Columbia, Canada, lying between the Fraser Canyon and the valley of the Lillooet River, south of the Chilcotin Plateau and north of the Lillooet Ranges...

 of the Interior of British Columbia

British Columbia Interior

The British Columbia Interior or BC Interior or Interior of British Columbia, usually referred to only as the Interior, is one of the three main regions of the Canadian province of British Columbia, the other two being the Lower Mainland, which comprises the overlapping areas of Greater Vancouver...

, Canada

Canada

Canada is a North American country consisting of ten provinces and three territories. Located in the northern part of the continent, it extends from the Atlantic Ocean in the east to the Pacific Ocean in the west, and northward into the Arctic Ocean...

, formed by Lajoie Dam

Lajoie Dam

Lajoie Dam is the uppermost of the storage dams of the Bridge River Power Project, which is located in the southwestern Interior of British Columbia. It is located just west of the small semi-ghost town of Gold Bridge. An earthfill structure, it is 87 m and impounds c. of water in Downton Lake...

, the uppermost of the series of dams and diversions of the Bridge River Power Project

Bridge River Power Project

The Bridge River Power Project is a hydroelectric power development in the Canadian province of British Columbia, located in the Lillooet Country between Whistler and Lillooet...

.

It was named for Geoffrey M. Downton, BCLS (British Columbia Land Surveyor), credited with first noting the hydroelectric potential inherent in the elevation differential between the Bridge River

Bridge River

The Bridge River is, or was, a major tributary of British Columbia's Fraser River, entering that stream about six miles upstream from the town of Lillooet.-Name:Its name in the Lillooet language is Xwisten , sometimes spelled Nxwisten or Nxo-isten)...

 and Seton Lake

Seton Lake

Seton Lake is a freshwater fjord draining east via the Seton River into the Fraser River at the town of Lillooet, British Columbia, about 22 km long and 243 m in elevation and 26.2 square kilometres in area...

 on opposing sides of Mission Ridge

Mission Ridge (British Columbia)

Mission Ridge, also known as Mission Mountain, is a ridge in the Bridge River-Lillooet Country of the South-Central Interior of British Columbia, Canada, extending westward from the town of Lillooet along the north side of Seton Lake to Mission Pass, which is immediately above and to the north of...

 above Shalalth in 1912. Mount Downton

Mount Downton

Mount Downton is the highest summit of the diameter Itcha Range, located northeast of Anahim Lake and east of Far Mountain in the Chilcotin District of the Central Interior of British Columbia, Canada. It lies within Itcha Ilgachuz Provincial Park....

 in the Chilcotin District

Chilcotin District

The Chilcotin District of British Columbia is usually known simply as "the Chilcotin", and also in speech commonly as "the Chilcotin Country" or simply Chilcotin. It is a plateau and mountain region in British Columbia on the inland lea of the Coast Mountains on the west side of the Fraser River....

is also named for him.