Lake Siriu, body of water

Lake Siriu is a reservoir on the Buzău River in Buzău County, impounded by a 122 m high and 570 m long embankment dam with a clay core, the second largest of its kind in Romania. The dark green water fills the valley up to the forested slopes, and the DN10 road runs along its contour on viaducts such as Giurca, 276 m long with 46 m high pillars.

Approved in January 1972 and finished in December 1994, the Siriu dam is a 122 m high, 570 m long rockfill embankment with a clay core, holding 8.3 million m³ of rockfill. It supplies drinking and industrial water, irrigates 50,000 ha, and feeds the 42 MW Nehoiașu hydroelectric plant. Its reservoir includes a 30 million m³ flood-attenuation volume, up to 980 m³/s.

The DN10 national road was rerouted around the lake's contour, so drivers cross the Giurca viaduct (276 m long, 46 m pillars) and the Stânca Tehărău viaduct. The dam stands 122 m high and 570 m long; the reservoir lies on the Buzău River, not the Siriu. Access is by road through Siriu commune, Buzău County.

The viaducts do not cross the lake: they carry the DN10 national road around it, on the contour line, after the dam forced the road to be rerouted. The Giurca viaduct is 276 m long with 46 m pillars, and the Stânca Tehărău viaduct runs over the rock of the slope of the same name.