"The Grand Coulee Dam, located on the Columbia River is the largest concrete structure in the United States. In addition to producing up to 6.5 million kilowatts of power, the dam irrigates over half a million acres of Columbia river basin farm land and provides abundant wildlife and recreation areas."

We were not at all surprised to see a very high degree of security here. Indeed, not even backpacks or purses were allowed inside the Information Center. Below is the Incline Railway which carries folks who take the tour from ground level to nearly water level.