Aguamilpa Dam, Hydroelectric power station and embankment dam in Tepic, Mexico

Aguamilpa Dam is a 187 m tall, 660 m long concrete-face rock-fill dam on the Río Grande de Santiago, 38 km northeast of Tepic, Nayarit. Its 14,000,000 m3 of fill sit at the head of a 73,800 km2 catchment and hold back a 127 km2 reservoir. The power station houses three 320 MW Francis turbine-generators.

Construction took place from 1989 to 1993 as a major infrastructure project funded by Mexico's government and the World Bank. The work represented an important step in developing the country's power supply.

The reservoir flooded land along the Río Grande de Santiago, and about 3,000 people were resettled for the Mexico Hydroelectric Development Project, which covered both this dam and Zimapán. The dam is formally named Aguamilpa Solidaridad, a reference to the national solidarity programme of the early 1990s. Its inauguration on 21 July 1993 was presided over by President Carlos Salinas de Gortari.

The dam lies 38 km northeast of Tepic on the Río Grande de Santiago, reached by road from the city. The San Rafael regulatory dam sits just downstream at 21°46′49″N 104°53′15″W. The reservoir covers 127 km², so plan travel time and check road conditions before setting out.

Aguamilpa's reservoir covers 127 km2 and holds 6,950,000,000 m3, flooding the Río Grande de Santiago valley. Downstream, the smaller San Rafael Dam regulates its releases. A planned second phase would add two more 320 MW generators to the three Francis units already installed.