La Yesca Dam is an embankment dam on the Santiago River 90 km (56 mi) northwest of Guadalajara on the border of Mexico's Nayarit and Jalisco states.

[3] Its construction will improve the regulation of water flow and subsequently power generation downstream at the El Cajón and Aguamilpa Dams.

The dam's crest elevation is 579 m (1,900 ft) above sea level and it sits at the head of a 51,590 km2 (19,919 sq mi) catchment area.

On the dam's left bank is a spillway controlled by six radial gates.

The reservoir has a surface area of 33.4 km2 (13 sq mi) and a normal elevation of 575 m (1,886 ft).