Diga di Simbirizzi, Water reservoir in Quartu Sant'Elena, Sardinia, Italy.

The Simbirizzi Dam is a concrete gravity structure in Quartu Sant'Elena on Sardinia that creates a large artificial lake in a natural basin. The structure stores water to serve agricultural lands across the surrounding countryside.

Built between 1951 and 1958 to a detailed design by engineer Mario Mulas, the dam was erected at the edge of a natural basin, forming the lake of the same name. It is owned by the Region of Sardinia and forms part of the regional multisectoral water system managed by the Ente acque della Sardegna.

The dam serves as a vital water source for local farmers who depend on its supply for their crops and livestock. Walking around the lake, you can see how this infrastructure supports the agricultural communities in the region.

The lake is accessible via local roads and rural paths around Quartu Sant'Elena and offers views of the water and surrounding landscape. It is best to visit during daylight hours and stick to established routes.

The dam is a masonry arch-gravity structure, not an earthfill one, built on the edge of a natural basin that forms Lake Simbirizzi. Its crest runs 57.10 metres at 35 metres above sea level, and at the maximum impoundment level of 33.50 metres the reservoir covers 3.23 square kilometres and holds 33.44 million cubic metres. The catchment directly feeding it covers about 7.80 square kilometres.