Astm contract for the seismic retrofit of the Golden Gate Bridge

Astm, a company rooted in Tortona and based in Turin, controlled by the Gavio Group, together with its American subsidiary Halmar International, has been awarded a contract worth 863.9 million dollars, about 770 million euros, to complete the seismic retrofit of the Golden Gate Bridge in San Francisco ^[1]. The bridge, opened in 1937, stands in one of the most seismically active areas of the planet, not far from the San Andreas fault ^[1].

The project

The work covers the bridge's two towers and side spans, including reinforcing the load-bearing structures, replacing the roadway's isolation joints and installing 28 devices designed to dissipate seismic energy. Repainting the top of the south tower is also planned. The aim is to ensure that the structure can quickly return to service after a strong earthquake, in particular guaranteeing the passage of emergency vehicles ^[1]. Completion of the works is set for September 2031 ^[1].

Site and timeline

The Golden Gate Bridge is 2.7 kilometres long, with a main span of 1,280 metres, and is crossed every day by about 95,000 vehicles, as well as pedestrians and cyclists. The site is proceeding without interrupting the crossing: work is also carried out beneath the roadway, and in the first phase restrictions are planned mainly during night hours, between 8 pm and 5 am, keeping at least one lane open in each direction ^[1]. The contract was approved by the Californian authorities in October 2025 and signed in December of the same year. The works entered their operational phase at the start of January 2026, while the first overnight lane closures began on 5 October 2026 ^[1].

Astm's role

The operation strengthens Astm's international presence: the company operates about 6,200 kilometres of motorways worldwide and has already taken part in infrastructure projects in Sweden, Denmark and Botswana ^[1]. Chief executive Umberto Tosoni spoke of «great pride» over the assignment, stressing the sense of responsibility tied to work on a structure of international importance ^[1].

Sources

1. Il Golden Gate Bridge si affida al gruppo Gavio: commessa da 770 milioni per proteggerlo dai terremoti — Quotidiano Piemontese, 2 November 2026