Initial funding was 15 years ago. Construction funds weren't approved until 2013 when construction contracts started to be awarded. Construction began in 2015.
"Progress continues across the 171 miles under construction and development in the Central Valley, including more than 30 active construction sites and 69 structures or grade separation projects either underway or completed."
https://en.wikipedia.org/wiki/History_of_California_High-Spe...
https://hsr.ca.gov/about/project-update-reports/2023-project...
"Progress continues across the 171 miles under construction and development in the Central Valley, including more than 30 active construction sites and 69 structures or grade separation projects either underway or completed."