Make a Difference and
Donate to MDIA


Donate Through PayPal

Donate Through MDIA's Vehicle Donation Program

Vehicle Donation

These are all great ways for you to support Mount Diablo State Park

Newsletter Sign Up
  1. First Name(*)
    Invalid Input
  2. Last Name(*)
    Invalid Input
  3. Email(*)
    Invalid Input
  4. Are you a real person?
    Invalid Input

View the Sitemap

Visit the Links page

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.

Important Announcement

MDIA Annual Membership Meeting Saturday, October 29 

All MDIA members and friends are invited to attend the annual MDIA membership meeting on Saturday, October 29, from 2 to 4 p.m. at Hoyer Hall in the Clayton Library (venue changed from Mitchell Canyon Picnic Area due to forecasted weather conditions).  

Clayton Library
6125 Clayton Road
Clayton, CA 94517 

clayton library

At noon, meet at the Mitchell Canyon Visitor Center for an optional docent-led hike up Mitchell Canyon, weather permitting (email This email address is being protected from spambots. You need JavaScript enabled to view it. on Saturday morning to confirm). Then join us from 2 to 4 p.m. at the Clayton Library to snack on light refreshments, learn what MDIA and Mount Diablo State Park have been up to and what’s coming up, and elect new MDIA Board members. 

The guest speaker will be E. Breck Parkman, Senior State Archaeologist and Tribal Liaison for the Bay Area and Sonoma-Mendocino Coast District of California State Parks. 

We look forward to seeing you there!

Hiker’s Guide to Mount Diablo State Park
is now available!hikers guide cover mdia-1

MDIA is pleased to announce that the much-anticipated Hiker’s Guide to Mount Diablo State Park has just arrived! This beautiful full-color book features comprehensive descriptions and stunning photographs, along with helpful maps and profiles for 50 hikes in the park including several new hike ideas. The Hiker’s Guide to Mount Diablo State Park strives to offer hikes that will be of interest to all park visitors, with distances ranging from less than half a mile, to a full marathon that circumnavigates the mountain.

Purchase at the Mitchell Canyon Visitor Center or Summit Visitor Center.

The March edition of East Bay's Diablo Magazine features three hikes from the Hiker’s Guide. Read Rachelle Cihonski’s take on these scenic spring hikes on Mount Diablo:


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.

Mary Bowerman Trail Is Open

09/26/15mary- bowerman

The northern paved portion of the Mary Bowerman Trail is open again for visitor use. The Americans with Disabilities Act (ADA) upgrades have been completed, and the north
side of Summit Road near the beginning of the trail is now an ADA parking area. Come see the finished work.

Rock City Audio Tour Is Now Available

Listen to our newest audio tour, a 1.6-mile walk exploring the history, geology, and plants of Rock City, one of the most popular places in Mount Diablo State Park. Also included is an audio portion describing the close relationship between the community of Diablo, the park and some of Californias most important historical figures. To listen, please click on this link or the link at the bottom of this page.
This tour has been made available through sponsorship by MDIA and the Diablo Country Club.

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).
Citizen Scientists: Help Monitor Fire Recovery!
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. .