Lake Mead & Hoover Dam A short visit to Hoover Dam, highest dam in the world when it was built in 1935. Entering Lake Mead Recreational Area Lake Mead Hoover Dam on Colorado River Hoover Dam on Colorado River, the highest dam in the world when completed in 1935 Hoover Dam on Colorado River Overview of the Hoover Dam visitor access and parking. Helpful sign to guide you around the twisting road to numerous overflow parking lots at Hoover Dam. View of the bypass bridge. Until the bridge was completed in 2010, all the interstate trafic was traveling over the Hoover dam, causing significant bottleneck on otherwise dual lane highway.