At present, the only major dams I know about are Presa Tepetapan  which dams the outflow of
Laguna Catemaco on behalf of the hydroelectric plant in Chilapan, and the
Presa Yuribia that
collects waters from the extinct volcano San Martin Pajapan to provide water for Minatitlan and
Coatzacoalcos in southern Veracruz.
Geography of Los Tuxtlas, Veracruz

Dams
Presa Yuribia near Tatahuicapan
Presa Tepetapan near Catemaco