Update on the Whittier Narrows Dam Safety Modifications
The Whittier Narrows Dam is an earthen dam constructed in 1957 by the United States Army Corps of Engineers. The dam stretches across a narrow gap between the Montebello Hills and the Whittier Hills at the confluence of the Rio Hondo and San Gabriel Rivers. Rosemead Boulevard (California State Route 19) crosses over the top of the dam and passes through the flood plain bordered by both rivers.