Dworshak Dam in the United States - the fourth-highest dam in the United States
Location show on map
North Fork Clearwater River, Idaho, USA
Date of build
1966 - start construction
1972 - completion of construction
March 1973 - commissioning of the power plant
Dworshak barrage is the fourth largest dam in the US and 25 in the world. It is also the highest dam with a straight axis in the northern hemisphere.
This is one of the most impressive looking and best integrated in the landscape there.
Dam has been given to Henry Dworshak - Governor of Idaho.
The decision to build was taken by the US Congress in 1962. Its construction was then classified as a military undertaking, aimed at flood protection and electricity production. Construction started 4 years later.
Just as during the construction of the Hoover Dam, the first stage of construction consisted in leveling the slopes of the mountains, which the dam was to cover. Dynamites and pneumatic hammers were used for this purpose. Then it's time to painstakingly pour out the concrete structure of the dam. At the end, turbines were installed. The whole was launched in March 1973.
The construction of the dam was completed in 1972, but the lake did not fill long enough, and before it happened it was necessary to move many animals to other places, and above all elk.
The Dworshak reservoir is 85 km long and some of it is located in the Bitterroot Mountains.
The length of the crown is 1,002 meters.
Power plant turbines located in the dam at the foot of the hall produce 380 MW of electricity (as much as 3 barrages in Solina).
In June 1980 at an altitude of 70 m, a small gap appeared in the structure of the dam, through which 40 liters of water per second leaked out of the tank. Fortunately, the solid structure of the dam meant that the crack did not increase. Engineers from U.S. The Army have plugged the hole using plastics and volcanic ash. Then the gap was covered with concrete. Currently, there is no trace after this accident.
The tank fulfills two more functions: recreational and as a breeding ground for fish. A part of Dworshak Lake is located in a nature reserve.