Sharps Heading (Mexicali)

Western terminus of the Alamo Canal, which supplied water to the Imperial valley before construction of the All American Canal. From this point water was delivered into the West Side Main Canal (to the southwest), the Central Main Canal (leaving to the west), and the Ash Canal(leaving to the north). Sharp's Heading also included a waste gate, which released unneeded water into the Alamo River (the river is still the most prominent feature visible).
Alas, the orig structure was made of wood, and is all gone. However, the orig the West Side Main Canal control gate was replaced by concrete, and most of the concrete control gate is still visible (at the south west corner of the outline). The concrete control gate and supporting walls are now part of a small park.
1906 picture of a control gate at Sharp's Heading is here:
books.google.com/books?id=6FpDAAAAYAAJ&printsec=frontco...
at pg 40