An ogee type spillway at the Crystal Dam in Colorado.
A U.S. Bureau of Reclamation photographer
Unknown date<div style="display: none;">Unknown date</div>
<a rel="nofollow" class="external free" href="https://www.usbr.gov/excellence/Drafts/Design_Standards_No_14_Chapter_1.pdf">http://www.usbr.gov/excellence/Drafts/Design_Standards_No_14_Chapter_1.pdf</a>