Poza Honda, Water reservoir in Manabí Province, Ecuador

Poza Honda is a dam located on the Portoviejo River in Manabí Province. The structure holds water that serves multiple cities along the coast and supports farming across the region.

The dam was built in the early 1970s to address water needs for the growing coastal region. Its construction marked an important step in modernizing water management for Manabí Province.

The reservoir's water is used to irrigate about 10,000 hectares of farmland in Manabí, and the dam supplies drinking water to Santa Ana, Portoviejo and Rocafuerte. The cantons served also include Manta, 24 de Mayo, Sucre, Jipijapa and Jaramijó. The name Poza Honda refers to the deep pool of the Portoviejo River where the dam was built.

The dam lies on the upper Portoviejo River, about 30 km from Portoviejo city; one source gives roughly 50 km, so allow for the longer figure. Access is by road from Portoviejo. The reservoir tail stretches about 12.5 km, and the 40 m-high earth embankment is best viewed from the surrounding slopes rather than up close.

The reservoir's capacity was first estimated at 100 million m³, but a bathymetric survey around 2001 revised it to 89 million m³. The dam's tail extends roughly 12.5 km up the Portoviejo River. Its spillway is 70 m long and can discharge up to 875 m³/s.