The El Cajón Dam, officially known as Central Hidroeléctrica Francisco Morazán, is a hydroelectric power plant located in Western Honduras.

El Cajón is a double arch dam, which uses parabolic geometry in horizontal and vertical axises to spread the weight of the impounded water to canyon walls which act as buttresses.

Harza Engineering of Chicago, Illinois, United States, began site investigation in the 1960s with initial construction beginning June 15, 1980.

Upon completion the dam became the largest piece of infrastructure in Honduras, requiring over half a million cubic meters of concrete to construct.

Now during the rainy season the reservoir has the ability to retain a layer of water ten meters high, and then discharge it slowly to prevent disastrous flooding.

The important role these devices play came into focus after a 7.1 magnitude earthquake, originating 200 miles north of Tegucigalpa, caused massive damage to many pieces of infrastructure May 28, 2009.