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Mount Diablo State Park
is one of the ecological treasures of the San Francisco Bay Area. Every season in the park has its special qualities. Discover them for yourself, from the mountain's 3,849-foot summit to its beautiful wildflowers, extensive trail system, fascinating wildlife and distinctive rock formations.


Welcome to the Mount Diablo Interpretive Association Website

Mount Diablo Interpretive Association (MDIA) is a non-profit all-volunteer organization that assists the California Department of Parks and Recreation in maintaining and interpreting Mount Diablo State Park for its 700,000 visitors each year. Through education, sponsored activities and publications, MDIA fosters appreciation and the enlightened use of Mount Diablo State Park. MDIA is proud to provide the resources necessary to keep the Summit Museum and Mitchell Canyon Visitor Center open throughout the year. In addition, one of MDIA’s key roles is coordinating the “Volunteers in Parks,” program, which trains and manages park docents, sponsors guided hikes, and helps maintain trails.


Water Shortage in Mount Diablo State Park
Updated 9/30/14

California is in the midst of its third straight year of drought. The entire state is in some stage of drought with more than 77% of the state experiencing “extreme” to “exceptional” drought conditions. The majority of the water used by park visitors at Mount Diablo State Park is produced through a series of springs that is fed to various water tanks. Once at the water tank, the water is treated and tested before being ready for public use. However, with the lack of rain the past three years, the springs on the mountain have been reduced to a trickle and water tanks are close to empty.

In order to meet the park’s basic water needs until the rainy season, the park has been forced to take a number of drastic measures in order to conserve water:

• Most of the park’s permanent flushing restrooms have been closed and portable toilets have been installed.

• The showers at Juniper Campground have been turned off. All campgrounds have portable toilets or pit toilets, except Live Oak Campground, where flush toilets and showers are now available. Drinking (potable) water is currently available in all campgrounds.

• Many of the water faucets located in the picnic areas and Rock City have been turned off.

ALL VISITORS ARE ENCOURAGED TO BRING WATER FOR CONSUMPTION DURING THEIR VISIT.

If you are planning a long hike, run, walk, bicycle ride or horseback ride, please bring plenty of water to ensure a safe and enjoyable visit. It is not unusual for heat-related illnesses (heat cramps, heat exhaustion and heat stroke) to occur at Mount Diablo State Park during the late spring, summer and early fall seasons. Although many of these illnesses can be treated without hospitalization, some heat related illnesses have proven fatal to park visitors in the past. By taking the necessary precautions, the vast majority of visitors enjoy a safe and memorable visit to Mount Diablo in all seasons.

Volunteer Opportunities

MDIA encourages the public to join our organization and become involved in its mission to support the park. We are always looking for dedicated volunteers to lead or help with various programs, outreach and operations. Volunteers can commit to as little as a couple of hours a week or volunteer on a project-specific, ad hoc basis and still provide vital assistance.(read more).


Tarantula Time

Tarantula time is almost over. While a few strays are still able to be found, the tarantulas came out early this year and are now few and far between. All guided hikes are full and no new hikes are being added this year. Keep an eye out on this website next August when the tarantulas again come out and we post next year’s tarantula hikes. 

If you want to learn more about tarantulas simply click on Tarantulas on Mount Diablo and Tarantula Time.

Maintenance Volunteer Group Completes Renovation of Live Oak Campfire Center


After several months of hard work, the Maintenance Volunteer Group at Mount Diablo State Park completed renovations to the Live Oak Campfire Center. The benches and stage were rebuilt and the projection screen cover was re-shingled and painted. In addition, a new computer/projector table was built using recycled redwood from the old benches. Photos below show the campfire center before and after, along with the volunteer group who worked on the project. A big thank you to Steve Williams, Jim Gray, Spencer Fulweiler, and Jim Mitchell for all their hard work! MDIA sponsored and coordinated the work for this project and purchased all of the materials. Visitors can now enjoy the summer campfire programs in style.

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New Picnic Area at the Summit

Mount Diablo State Park is pleased to announce that a new picnic area is now available at the Summit. Located at the Lower Summit, this new picnic area offers a variety of picnic tables (some sun shaded), cook grills and paved walkways. Fully handicap accessible, this new area is well suited for family or group gatherings. Also, there are nearby restrooms, interpretive panels and an impressive scenic overlook.
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Citizen scientists: help monitor fire recovery!
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Check out the four camera stations along the Mary Bowerman (Fire Interpretive) Trail and other locations in the Morgan Fire burn area. Please take photos with your smart phone and upload them to social media. Our partner group Nerds for Nature will use the photos to create a time-lapse video of the landscape recovering and changing over the next several years. Please participate when you see the stations and be a part of studying the fire recovery. Contact Cyndy Shafer at
This email address is being protected from spambots. You need JavaScript enabled to view it. .


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