Infiernillo Dam

{{Infobox dam

| name = Infiernillo Dam

| name_official = Presa Adolfo López Mateos

| image =Presa de Infiernillo.jpg

| image_size =

| image_caption =

| image_alt =

| location_map = Mexico

| location_map_size =

| location_map_caption =

| coordinates = {{coord|18|16|23|N|101|53|34|W|type:landmark|display=inline,title}}

| country = Mexico

| location = La Unión, Guerrero

| status = In use

| construction_began =

| opening = 1965

| demolished =

| cost =

| owner = Comisión Federal de Electricidad

| dam_type =

| dam_height = {{Convert|149|m|ft|0|abbr=on}}

| dam_length = {{Convert|344|m|ft|0|abbr=on}}

| dam_width_crest =

| dam_width_base = {{Convert|570|m|ft|0|abbr=on}}

| dam_volume = {{Convert|5500000|m3|ft3|0|abbr=on}}

| dam_crosses =

| spillway_count =

| spillway_type =

| spillway_capacity =

| res_name = Infiernillo Reservoir

| res_capacity_total = {{Convert|12000000000|m3|acre.ft|0|abbr=on}}

| res_catchment =

| res_surface =

| res_max_depth =

| res_tidal_range =

| plant_operator =

| plant_commission = 1965

| plant_decommission =

| plant_type =

| plant_turbines =

| plant_capacity = 1,120 MW

| plant_annual_gen =

| website =

| extra =

}}

The Infiernillo Dam ("Little hell"), also known as Adolfo López Mateos Dam, is an embankment dam on the Balsas River near La Unión, Guerrero, Mexico. It is on the border between the states of Guerrero and Michoacán.{{Cite web|title=Google Maps|url=https://www.google.com/maps/place/Presa+Infiernillo/@18.273078,-101.9035583,15.25z/data=!4m13!1m7!3m6!1s0x84315c6e5fce0357:0x580e1b634308e622!2zTMOhemFybyBDw6FyZGVuYXMsIE1pY2hvYWPDoW4sIE1leGljbw!3b1!8m2!3d17.9567646!4d-102.1943485!3m4!1s0x8433d01f7cf475b9:0x3c7dc6d38848a56a!8m2!3d18.2677651!4d-101.8925802|access-date=2022-01-31|website=Google Maps|language=en}} The dam supports a hydroelectric power station containing six turbine-generators for a total installed capacity of 1,120 MW. The dam is {{Convert|149|m|ft|0|abbr=on}} high, {{Convert|344|m|ft|0|abbr=on}} long and is owned by Comisión Federal de Electricidad. Its first generator was operational on January 25, 1965.{{cite web|title=Hydroelectric |url=http://www.cfe.gob.mx/QuienesSomos/estadisticas/listadocentralesgeneradoras/Paginas/listadohidroelectricas.aspx |publisher=CFE |language=Spanish |accessdate=28 January 2011 |url-status=dead |archiveurl=https://web.archive.org/web/20110126213330/http://www.cfe.gob.mx/QuienesSomos/estadisticas/listadocentralesgeneradoras/Paginas/listadohidroelectricas.aspx |archivedate=26 January 2011 }}{{cite web|title=Monografía: Descripción de la represa hidroeléctrica "EL INFIERNILLO|url=http://arandu.org.ar/pub/presahidroelectricaelinfiernillo.pdf|publisher=CONSTRUCCIONES HIDRÁULICA|accessdate=28 January 2011|language=Spanish|year=2001|archive-url=https://web.archive.org/web/20110706084310/http://arandu.org.ar/pub/presahidroelectricaelinfiernillo.pdf|archive-date=6 July 2011|url-status=dead}}

Placement of the dam embankment began in August 1962, and on December 7, 1963, the dam was topped off. The diversion tunnels were closed and the reservoir began to fill on June 15, 1964.{{cite book|last=Marr|first=sponsored by The Geo-Institute of the American Society of Civil Engineers ; edited by W. Allen|title=A history of progress : selected U.S. papers in geotechnical engineering|year=2002|publisher=American Society of Civil Engineers|location=Reston, Virginia|isbn=0-7844-0656-1|url=https://books.google.com/books?id=vGCqACNvq7UC&q=Infiernillo+dam&pg=PA1524|page=1524}}