The Bonneville Dam spans the Columbia River linking the two states of Washingon and Oregon. A Public Works Administration project of FDR's New Deal, portions of Bonneville Lock and Dam project were declared a National Historic Landmark in 1987. To enter we had to drive through a security checkpoint. No backpacks or large purses were allowed inside the complex. Bonneville consists of two hydroelectric generation dams: one on the Oregon side and one on the Washington side. There is also a spillway dam in the center of the river. Fish ladders at both sides allow migrating fish to swim upstream. Chinook, coho, and sockeye salmon, steelhead, shad and other fish use the ladders in their upstream migration. At each fishway, a worker counts the various species of adult fish moving up the ladder. Yesterday's count totaled over 44,000 fish, the majority being chinook salmon.