California's long-gestating plan to construct a massive tunnel that will pump water from the state's Sacramento–San Joaquin ...

Today, L.A. Metro’s subway tunnels connect some of the city’s most densely populated neighborhoods. There are many other ...

LOS ANGELES (AP) — A Southern California water agency has approved key funding needed to support plans for a giant underground tunnel that would reroute a big part of the state’s water supply.

Valley Water in the South Bay ... design of the 45-mile long underground tunnel that would connect the Sacramento–San Joaquin River Delta with the California Aqueduct. The Santa Clara Valley ...

Many Sacramento-San Joaquin Delta residents oppose plans by the state of California to build a tunnel under the estuary to divert water from the Sacramento River and send it to the south part of the ...

The Santa Clara Valley Water District met Tuesday to consider whether to continue supporting Governor Gavin Newsom's controversial Delta water tunnel ... farms and Southern California water ...

rehabilitate and upgrade the 19-mile-long Mountain Tunnel, a key component of the Hetch Hetchy Water System that takes water from Tuolumne County and sends it to San Francisco. The San Francisco ...

There are many other great tunnels in Southern California, along with thousands of important water, sewage, and drainage tunnels crisscrossing the region, but we’ll have to cover those another day.