The Craig Goch dam in the Elan valley of Wales ids also called Top Dam. It is masonry dam built and the reservoirs were built for the sole purpose of supplying water to Birmingham. Construction of the dam was started in 1897 and was completed in 1904. Besides supplying water the dam is also a source of generating hydroelectricity after a 480 kW hydroelectric generator started operating in 1997. Standing in a river valley with picturesque landscape the unusual historical dam attracts many visitors who want to explore the area. Visit the page for seeing its amazing pictures.