Skip to main content

Patterson Pass Road

Recently on a day trip to the San Francisco Bay Area I traversed the Diablo Range eastbound via Patterson Pass Road.


Patterson Pass Road is an approximately 13 mile roadway which starts at Mines Road in Livermore of Alameda County.  Patterson Pass Road eastward ascends over the approximately 1,600 foot namesake Patterson Pass into San Joaquin County where it ends at Interstate 580 near Tracy.  Patterson Pass Road has an infamous reputation as being a dangerous roadway due to the lengthy one-lane section and heavy rush-hour commute traffic.

Patterson Pass is one of the earliest documented European paths of travel over the Diablo Range as it was explored during the 1775-1776 Spanish Expedition led by Juan Bautista de Anza.  The 1775-1776 Spanish expedition charted out much of San Francisco Bay which led to the founding of the Presidio of San Francisco and Mission San Francisco de Asis.  Patterson Pass Road between Cross Road east to Midway Road is part of the Juan Bautista de Anza National Trail.  The Juan Bautista de Anza Trail is a 1,210 mile Auto Touring Route organized by the National Park Service which closely follows the 1775-1776 Spanish expedition from modern day Tubac, Arizona to the San Francisco Bay Area.  More information regarding the Juan Bautista de Anza National Historic Trail can be found on nps.gov and cahighways.org.

nps.gov on Juan Bautista de Anza National Historical Trail

cahighways.org on Juan Bautista de Anza National Trail in California

Patterson Pass ultimately didn't become part of the inland route of travel between the Spanish Missions on El Camino Viejo.  The route of El Camino Viejo was to the south over Corral Hollow Pass via what is now Signed County Route J2 on Tesla Road.   The earliest highway map I can find clearly showing Patterson Pass Road is a CSAA edition from 1917.

1917 CSAA State Highway Map

Patterson Pass Road can be seen on the 1935 California Division of Highways Mas of Alameda County.

1935 Alameda County Highway Map

My approach to Patterson Pass Road was from southbound Vasco Road in Livermore.  I made a left hand turn from Vasco Road onto Patterson Pass Road eastbound.



Patterson Pass Road between Vasco Road east to Greenville Road four-lanes and is directly north of Lawrence Livermore National Laboratory.



At Greenville Road the path of Patterson Pass Road drops to two lanes and exits the City of Livermore.



Patterson Pass Road east of Greenville Road to Cross Road has numerous road safety features.  Most of the traffic control measures seem to be oriented at slowing down commuter traffic.







East of Cross Road the alignment of Patterson Pass Road drops to a single lane and picks up the Juan Bautista de Anza National Historic Trail.  Patterson Pass Road is a wide single lane and quickly ascends to Patterson Past.














Patterson Pass has a wide shoulder that is worth pulling over to see as there is two wide vistas.  This view is from Patterson Pass looking west towards Livermore Valley.


The sharp descent in Patterson Pass Road eastward from the top of Patterson Pass is very dramatic to the eye.


From Patterson Pass almost all of the Altamont Pass Wind Farm can be seen.  The Altamont Pass Wind Farm was commissioned in 1981 and now consists of 4,930 wind mills which are capable of producing 576 Megawatts of electricity.


The eastward drop on Patterson Pass Road is fast and rolls through the hill side.


















As Patterson Pass Road approaches Midway Road the Altamont Pass Wind Farm sub-station can be seen at the former rail siding location Midway . Patterson Pass Road crosses under a Union Pacific rail underpass which originally part of the Western Pacific Railroad.






At Midway Road the Juan Bautista de Anza National Historic Trail splits off of Patterson Pass Road.  Patterson Pass Road expands back out to two-lanes approaching the San Joaquin County Line.



Patterson Pass Road continues eastward to I-580 as a normal two-lane roadway.





Comments

Popular posts from this blog

Dillon Road

Dillon Road is a 34.2-mile highway located in northern Coachella Valley of Riverside County, California.  Dillon Road begins at Avenue 48 on the outskirts of Indio and ends to the west at California State Route 62 near San Gorgonio Pass.  Dillon Road was developed the 1930s as a construction road for the Colorado River Aqueduct.  Dillon Road serves as a northern bypass to much of the development of Coachella Valley.  Dillon Road is known for it's frequent dips and spectacular views of San Gorgonio Pass.   Part 1; the history of Dillon Road Dillon Road was constructed as a haul road for the Colorado River Aqueduct through Coachella Valley.  The Colorado River Aqueduct spans 242 miles from Parker Dam on the Colorado River west to Lake Mathews near Corona.  Construction of the Colorado River Aqueduct began during January 1933 near Thousand Palms and was made functional on January 7, 1939.  West of Berdoo Canyon Road the alignment of Dillon Road is largely concurrent with the Colorado

Tehachapi-Willow Springs Road

Tehachapi-Willow Springs Road is an approximately 21-mile highway located in southeast Kern County.  Tehachapi-Willow Springs Road begins at Tehachapi Boulevard (former US Route 466) in Tehachapi and crosses the Tehachapi Mountains via the 4,820-foot-high Oak Creek Pass.  Tehachapi-Willow Springs Road enters Antelope Valley of the wider Mojave Desert and passes by the historic stage station of Willow Springs to a southern terminus at Rosamond Boulevard.  Tehachapi-Willow Springs Road has historic ties to the Havilah-Los Angeles Road and Stockton-Los Angeles Road due to the once reliable presence of water at Willow Springs. Part 1; the history of Tehachapi-Willow Springs Road Oak Creek Pass and Willow Springs were known to the local tribes of the Tehachapi Mountains for generations.  The first documented European crossing of Oak Creek Pass was during 1776 as part of an expedition by Francisco Garces.  Oak Creek Pass is as used again by John C. Fremont during an 1844-1845 expedition to e

Oldtown Toll Bridge - Maryland and West Virginia

  The Oldtown Toll Bridge linking Oldtown, Maryland over the Potomac River with neighboring Green Spring, West Virginia is only one of a few truly privately owned toll bridges located in the United States. It's a simple bridge by design, as the 318 foot long Oldtown Toll Bridge is a low water bridge. Low water bridges are designed to allow water to safely and efficiently flow over the bridge deck. Additionally, a dozen concrete pedestals have been secured in the Potomac River in order to support the bridge and wooden deck. The bridge was constructed in 1937 when a gentleman by the name of Mr. Carpenter obtained the proper permits to build the Bridge through an Act of Congress. This was a blessing for residents, especially on the West Virginia side of the Potomac River, as it saved motorists commuting to Cumberland an hour in travel time. Using Mr. Carpenter's blueprints, the Army Corp of Engineers and a number of local laborers constructed the bridge and it remained under the