Skip to main content

California State Route 84 west from Interstate 880 over the Dumbarton Bridge

On a recent Bay Area trip I took California State 84 west from Interstate 880 over San Francisco Bay via the Dumbarton Bridge.


The Dumbarton Bridge is a 1.63 mile structure crossing San Francisco Bay near Dumbarton Point.  The Dumbarton Bridge is the southernmost bridge in San Francisco Bay and the shortest.  The current Dumbarton Bridge was completed by 1982 in a four-lane configuration and was expanded to six-lanes by 1989.

The original Dumbarton Bridge opened in 1927 and was built private money.  The 1927 Dumbarton Bridge was similar to the 1929 San Mateo-Hayward Bridge in that it featured a causeway structure and a center vertical lift span.  Like the 1929 San Mateo-Hayward Bridge the 1927 Dumbarton Bridge was purchased by the California Division of Highways in 1951.  The 1927 Dumbarton Bridge became part of Legislative Route 107 which already existed on both ends of the structure since 1933.  Said change to LRN 107 can be observed by comparing the 1951 State Highway Map to the 1952 edition.

1951 State Highway Map

1952 State Highway Map

LRN 107 and the 1927 Dumbarton Bridge would become part of CA 84 during the California Highway Renumbering of 1964.

1963 State Highway Map

1964 State Highway Map

The 1927 Dumbarton Bridge was mostly demolished in 1984 but a small portion of the eastern approach near in Newark exists as a fishing pier.

My approach to CA 84 west and the Dumbarton Bridge were from I-880 south.





CA 84 west enters the City Limits of Newark (Alameda County) west of I-880.  CA 84 west to the Dumbarton Bridge toll is a freeway grade signed at 65 MPH.


Heading west on CA 84 it is apparent some of the overhead signage has seen better days.


Tolls for the Dumbarton Bridge are collected on westbound CA 84 and are $6 dollars cash for a two axle vehicle.  The last Exit before the Dumbarton Bridge toll is at Thorton Avenue/Paseo Padre Parkway.








West of the Dumbarton Bridge toll the route of CA 84 largely falls below freeway standards and has a poor surface quality.  The speed limit over the Dumbarton Bridge is 55 MPH.









As the Dumbarton Bridge rises over San Francisco Bay it enters San Mateo County and Menlo Park.


The Dumbarton Bridge ends in Menlo Park.  CA 84 continues west over the San Cruz Mountains to CA 1 on the Pacific Ocean.  After crossing the Dumbarton Bridge I turned south on CA 109 on University Avenue.










Comments

Popular posts from this blog

Deer Isle Bridge in Maine

As graceful a bridge that I ever set my eyes upon, the Deer Isle Bridge (officially known as the Deer Isle-Sedgwick Bridge) surprisingly caught my eye as I was driving around coastal Maine one Saturday afternoon. About 35 miles south of Bangor, Maine , the Deer Isle Bridge connects the Blue Hill Peninsula of Downeast Maine with Little Deer Isle over the Eggemoggin Reach on ME 15 between the towns of Sedgwick and Deer Isle . It should be noted that Little Deer Isle is connected to Deer Isle by way of a boulder lined causeway, and there is a storied regatta that takes place on the Eggemoggin Reach each summer. But the Deer Isle Bridge holds many stories, not just for the vacationers who spend part of their summer on Deer Isle or in nearby Stonington , but for the residents throughout the years and the folks who have had a hand bringing this vital link to life.   The Deer Isle Bridge was designed by David Steinman and built by the Phoenix Bridge Company of Phoenixville,

Former US Route 99 through Athlone and the last Wheeler Ridge-Sacramento corridor expressway

Athlone was a siding of the Southern Pacific Railroad located in Merced County on the alignment of what was US Route 99 between the cities of Chowchilla and Merced.  The Athlone corridor of US Route 99 was one of the first in San Joaquin Valley to fully upgraded to four lane expressway standards.  The Athlone expressway corridor was inherited by California State Route 99 when US Route 99 was truncated to Ashland, Oregon during June 1965.  The four-lane expressway through Athlone was the last segment of what had been US Route 99 in the Wheeler Ridge-Sacramento corridor to be bypassed by a freeway.  The Athlone expressway corridor was bypassed by the modern California State Route 99 freeway in 2016.  Despite being put on a road diet and narrowed what was the Athlone expressway corridor still displays evidence of being part of US Route 99.   Above the blog cover photo displays the Athlone expressway corridor of US Route 99 south of Merced as depicted in the July 1939 California Highways &

California State Route 38

California State Route 38 is a fifty-nine-mile State Highway located entirety in San Bernardino County and a component of the Rim of the World Highway.  California State Route 38 begins at California State Route 18 at Bear Valley Dam of the San Bernardino Mountains and follows an easterly course on the north shore of Big Bear Lake.  California State Route 38 briefly multiplexes California State Route 18 near Baldwin Lake and branches east towards the 8,443-foot-high Onyx Summit.  From Onyx Summit the routing of California State Route 38 reverses course following a largely westward path through the San Bernardino Mountains towards a terminus at Interstate 10 in Redlands.   Pictured as the blog cover is California State Route 38 at Onyx Summit the day it opened to traffic on August 12th, 1961.   Part 1; the history of California State Route 38 California State Route 38 (CA 38) is generally considered to be the back way through the San Bernardino Mountains to Big Bear Lake of Bear Valley