description Caldecott Tunnel Overview
A highway tunnel carrying SR 24 through the Berkeley Hills in California; the first two bores opened in 1937 and a fourth bore was added in 2013, making it the only four-bore highway tunnel in the US.
help Caldecott Tunnel FAQ
Where is the Caldecott Tunnel located?
The Caldecott Tunnel carries State Route 24 through the Berkeley Hills in California. It serves as a vital commuter route connecting the cities of Oakland and Orinda.
How many bores does the Caldecott Tunnel have?
The Caldecott Tunnel is currently composed of four separate bores, making it the only four-bore highway tunnel in the United States. The newest fourth bore was completed and opened to traffic in 2013.
When did the original Caldecott Tunnel open?
The first two bores of the Caldecott Tunnel officially opened to drivers in 1937. These original bores were crucial in establishing a direct link between the East Bay and central Contra Costa County.
Why was a fourth bore added to the Caldecott Tunnel?
A fourth bore was added in 2013 to relieve heavy daily traffic congestion and allow traffic managers to dedicate bores specifically for commute directions. Before this addition, drivers frequently experienced major delays during off-peak reversals.
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