President Joe Biden signed the infrastructure bill into law in November 2021. However, with inflation at a 40-year high, billions of dollars have already been lost from the $1.2 trillion earmarked for upgrading America's roads, sewers, airports, bridges and dams. States are having to delay or cancel projects they had planned to build. Thankfully, a number of ambitious megaprojects are already under construction. From high-speed rail in California to America's first nuclear power plant in more than 30 years, read on to discover some of the biggest projects currently under construction in the US – and when we might expect them to finish.