Terzaghi Dam is the key diversion dam in

BC Hydro The British Columbia Hydro and Power Authority, operating as BC Hydro, is a Canadian electric utility in the province of British Columbia. It is the main electricity distributor, serving more than 4 million customers in most areas, with the excep ...

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 harnesses the power of the Bridge River, a tributary of the Frase ...

. It forms the project's largest reservoir,

Carpenter Lake Carpenter Lake, officially Carpenter Lake Reservoir, is the largest of the three reservoirs of the Bridge River Power Project, which is located in the mountains west of Lillooet, British Columbia. The lake is about 185 kilometres north of the pro ...

west of

Lillooet Lillooet () is a district municipality in the Squamish-Lillooet region of southwestern British Columbia. The town is on the west shore of the Fraser River immediately north of the Seton River mouth. On BC Highway 99, the locality is by road abou ...

. Originally known as the Mission Dam, it was renamed Terzaghi Dam in 1965 to honor

Karl von Terzaghi Karl von Terzaghi (October 2, 1883 – October 25, 1963) was an Austrian mechanical engineer, geotechnical engineer, and geologist known as the "father of soil mechanics and geotechnical engineering". Early life In 1883, he was born the first c ...

, the civil engineer who founded the science of

soil mechanics Soil mechanics is a branch of soil physics and applied mechanics that describes the behavior of soils. It differs from fluid mechanics and solid mechanics in the sense that soils consist of a heterogeneous mixture of fluids (usually air and wat ...

. It is located about 30 km up the

Bridge River The Bridge River is an approximately long river in southern British Columbia. It flows south-east from the Coast Mountains. Until 1961, it was a major tributary of the Fraser River, entering that stream about six miles upstream from the town of ...

from its confluence with the

Fraser Fraser may refer to: Places Antarctica * Fraser Point, South Orkney Islands Australia * Fraser, Australian Capital Territory, a suburb in the Canberra district of Belconnen * Division of Fraser (Australian Capital Territory), a former federal ele ...

. It stands at the head of the Big Canyon of the

, completely blocking the river, which is diverted through two tunnels through Mission Mountain to a pair of powerhouses on

Seton Lake Seton Lake is a freshwater fjord draining east via the Seton River into the Fraser River at the town of Lillooet, about long, in area and lies at an elevation of . Its depth is . The lake is natural in origin but was raised slightly as part of ...

. The difference in elevation between Carpenter Lake, the reservoir formed by Terzaghi Dam, and the two powerhouses on

is c. 410 m, which in combination with the flow of the entire Bridge River generates 480

megawatts The watt (symbol: W) is the unit of power or radiant flux in the International System of Units (SI), equal to 1 joule per second or 1 kg⋅m2⋅s−3. It is used to quantify the rate of energy transfer. The watt is named after James Watt ...

in electrical power. Completed in the 1950s, it was the expansion of a concept first launched in the 1920s by the Bridge River Power Development Co. but abandoned due to rising costs and collapsed investments as a result of the

Great Depression The Great Depression (19291939) was an economic shock that impacted most countries across the world. It was a period of economic depression that became evident after a major fall in stock prices in the United States. The economic contagio ...

. It was later resumed by

BC Electric The British Columbia Hydro and Power Authority, operating as BC Hydro, is a Canadian electric utility in the province of British Columbia. It is the main electricity distributor, serving more than 4 million customers in most areas, with the excep ...

during the

post-war boom In Western usage, the phrase post-war era (or postwar era) usually refers to the time since the end of World War II. More broadly, a post-war period (or postwar period) is the interval immediately following the end of a war. A post-war period c ...

after

World War II World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all of the great powers—forming two opposin ...

and a first diversion and powerhouse completed in 1948 (180MW), the second in 1960 (300MW). Projects organizing timed releases of water through Terzaghi Dam to enable fish-spawning ecology in the nearly-dry Bridge River below the dam are underway.

External links

BC Hydro Bridge River Project
Dams in British Columbia Bridge River Country BC Hydro Publicly owned dams in Canada {{cariboo-geo-stub

See also

External links