It really is very impressive. The dam is 297 feet high from bottom to top; 266 feet broad at its base. The dam’s foundation goes down 130 feet below the riverbed and contains 850,000 cubic yards of masonry. At the time of its opening (1906), it was the tallest dam in the world.
This view looking upwards from the base gives a good sense of just how massive the dam is. I like the way the stairs take the eye part of the way into the scene and then the buttress takes you up the rest of the way to the top. I also like the textures of the stone. Apart from the blue sky the composition was largely monochromatic so a black and white conversion seemed in order.
For another view see below: