Learn about the Juan Bautista de Anza Expedition in Contra Costa County and throughout California as the Declaration of Independence was being signed
By LeighAnn Davis, Executive Director, Contra Costa County Historical Society
As our nation approaches its 250th anniversary, land managers, historians, educators and civic leaders across the East Bay formed the East Bay Anza 250 Symposium committee dedicated to exploring a parallel milestone: the 250th anniversary of the Juan Bautista de Anza expedition. This journey profoundly shaped California’s history and continues to influence our communities today.
According to the National Park Service, the Juan Bautista de Anza National Historic Trail covers over 1,200 miles through the homelands of 70+ Tribal communities including in Contra Costa County. It follows the historic route of the 1775-76 Spanish colonizing expedition from Sonora, Mexico to San Francisco, CA. Whether urban or rural, the trail offers adventure, diverse cultural perspectives and an opportunity to experience history.
On June 27, 1776, as the Declaration of Independence was being signed in Philadelphia, the colonists of the Anza expedition arrived at their destination in what would become San Francisco. Both of these events would dramatically shape the cultural and political landscapes of the United States. In 2025 and 2026, the Anza Trail invites communities along the historic path of the 1775-76 colonizing expedition to commemorate the complicated and evermore fascinating history of the paths and events that make up this National Historic Trail.

Third leg of the expedition from Mission San Gabriel to Monterey including campsites 99, 100 and 101 in Contra Costa County. Map created by Emanuel Delgado. Source: National Park Service
Campsites and Trail in Contra Costa County
A map of the Third Leg of the Anza Expedition shows three campsites in Contra Costa County with the Arroyo del Puerto Dulce campsite 99 in Rodeo, the Arroyo de Santa Ana del Flugino campsite 100 in Concord and the San Ricardo campsite 101 along the Antioch/Oakley border.
According to the Juan Bautista de Anza Historic Trail website, “On April 1st (1776) the group camped at a small stream. Today, the campsite is at the conjunction of Parker and San Pablo Avenues and Rodeo Creek. A commemorative marker from the 1976 reenactment is on Parker Road between 4th and 6th Streets in front of the post office in the town of Rodeo.”

The Anza Expedition campsite 99 historic marker in Rodeo, campsite 100 historic marker in Concord and campsite 101 historic marker at the Antioch/Oakley Regional Shoreline. Photos by Andrew Ruppenstein. Source: The Historical Marker Database HMdb.org
According to The Historical Marker Data Base, a marker designating campsite 100 in Concord is located on Grant Street south of Olivera Road. The marker designating campsite 101 is located in the Antioch/Oakley Regional Shoreline park at the end of Bridgehead Road.
The East Bay Park District’s Delta de Anza Regional Trail is named to commemorate the route taken during de Anza’s expedition into the Delta region of today’s East Contra Costa County. The paved, multi-use hiking, bicycling and equestrian trail currently spans over 15 miles of the planned 25-mile length. When completed, it will generally follow the East Bay Municipal Utility District’s corridor and the Contra Costa Water District’s canal.
This trail connects communities in central and eastern Contra Costa County and provides access to regional and community parks, many schools and Los Medanos College. It intersects Antioch’s Mokulumne Trail and the Marsh Creek Regional Trail in Oakley. It connects the cities and communities of Concord, Bay Point, Pittsburg, Antioch and Oakley and provides access to Contra Loma Regional Park and Black Diamond Mines Regional Preserve through Antioch’s Worth Shaw Community Park. See driving map of Anza Historic Trail
The East Bay Anza 250 Symposium will take place on Saturday, April 11, 2026, 9AM-4PM and is a collaborative gathering that explores the expedition’s impact on the East Bay, honors Indigenous legacies, and fosters dialogue about how this history informs our present.
The symposium will include:
- Live Performances
- Keynote Speakers
- Panel Discussions that Dive into the History, Teaching, and Environmental Impacts of the Expedition.
- An Exhibit Hall Filled with Cultural Exhibitions and Displays
Symposium registration is $30 for General Admission and $20 for students and seniors.
Lunch is included in your registration fee if reserved before April 1st, 2026.
To register, please visit the Eventbrite site for Grassroots Poetry using the QR code.
Keynote Speakers: Our speaker series brings together a vibrant tapestry of voices to explore the multifaceted legacy of the Anza Expedition. By pairing the scholarly insights of local historians and naturalists with the deeply personal narratives of expedition descendants, we aim to provide an inclusive history that honors the trail’s complex past.
Panel Discussions: Join our interdisciplinary panels, featuring local historians, expert naturalists, and descendants of the expedition, for a compelling look at the impact of Anza 250 years later. These sessions bring together diverse voices to explore the environmental, cultural, and personal history of the trail, offering a unique, in-depth, and engaging perspective on this historic journey.
Exhibit Hall: Our Exhibit Hall is a testament to the power of community partnership. The exhibit hall is a collaborative space showcasing exhibits and information from local historical societies and land management agencies. Connect with local experts in this dedicated space for a deeper, context-rich understanding of the historical and cultural significance of the Anza Trail.
Event Information:
The Event is Saturday, April 11th, 2026, from 9AM until 4PM with a lunch break at noon.
An optional walk will take place along the trail that intersects with the LMC campus at 8AM.
All members of the community are invited to join us and enjoy the speakers, poets, and music guests!
About our location:
The Los Medanos College Student Union is located on the campus at 2700 East Leland Road, Pittsburg.
We encourage all symposium attendees to consider alternate ways to get to campus. You can bike, walk, carpool or take public transportation. If you plan to arrive by car, parking is free on the day of the event. More information about how to get to campus here: LMC Transportation and Parking Information
Thank you to all our partners for your support:
- Grassroots Poetry
- Independent Arts and Media
- Los Medanos College Honors Program
- National Park Service
- Anza Trail Foundation
- Sacramento-San Joaquin Delta Conservancy
- Contra Costa County Historical Society
- Museum of the San Ramon Valley
For more information contact Dwayne Eubanks, Chair East Bay Anza 250 Symposium at EastBayAnza@gmail.com.
This event is brought to you by Grassroots Poetry and Los Medanos Honors Program and fiscally sponsored by Independent Arts Media, a 501(c)3 organization.
Allen D. Payton contributed to this report.


























