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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.

Castle Rock Area in Mount Diablo State Park to Close for Falcon Nesting Season

The area known as “Castle Rock” in Mount Diablo State Park will be closed to visitors from February 1 to July 31 to help protect the Peregrine Falcons during their nesting season. This is an annual closure, as the Peregrine Falcon is listed as a “Fully Protected Species” in California. This raptor is territorial and highly sensitive to disturbance during nesting season.

California State Parks has partnered with East Bay Regional Park District, the operator of the Diablo Foothills Regional Park, which neighbors the closed area, to educate rock climbers and the general public of this closure and the importance of protecting the Falcon. Signs and educational panels are placed in the area to advise and educate users about the closure.

Violators are subject to penalty by fine. Rock climbers will be encouraged to use an alternate climbing area of the park during the closure.

2015-01-22 Castle Rock Closure Nesting News Release

Public Input on Mount Diablo State Park Draft Road and Trail Management Plan

California State Parks is seeking public input on the Mount Diablo State Park Draft Road and Trail Management Plan through June 30, 2015. Two public open house meetings will be held:

Tuesday, May 12, 2015, 6-8 p.m.
Danville Veteran’s Memorial Building, 400 Hartz Avenue, Danville, CA 94526
Wednesday, May 13, 2015, 6-8 p.m.
Centre Concord, 5298 Clayton Road, Concord, CA 94521
For more information about the public meetings and the plan, go to

Water Shortage in Mount Diablo State Park

updated 12/19/14

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:
  • All of the water faucets located in the picnic areas and Rock City have been turned off as a result of the drought.
  • The restrooms at the Live Oak Campground are closed.
  • The Live Oak Campground closes on a seasonal basis from November 1st through March 31st. 
  • Flush toilets are available at the Juniper Campground, the Lower Summit Parking Lot and the Upper Summit Parking Lot.
  • Water at the Juniper Campground has been turned on with the restrooms, showers and water faucets available for use.


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.

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).

New - Men's - White Mount Diablo Bike Jerseys For Sale

This bike jersey is great for those celebrating a ride to Mount Diablo's Summit or anyone who loves Mount Diablo.
   MDIA JerseyWhiteFrontSquare MDIA JerseyWhiteBackSquare

Short sleeve cycling jersey with full concealed zipper in a "club cut" ("relaxed American fit"). 100% Polyester. Jersey has three rear pockets and has the California State Park Seal on the shoulders and Mt. Diablo Summit Elevation (3849 Feet) on the back. 
White is available only in MENS sizes medium, large, extra large and 2X.
On sale at the Mount Diablo State Park Summit Visitors Center and on line on this website.

Original Green Jerseys are also available for sale in men's and women's sizes

The Falls Are Flowing Again in Mount Diablo State Park!

Recent rainfall has created a welcome opportunity to view waterfalls and cascades at their gushing, sparkling best. The popular Falls Trail can be accessed from Regency Gate, located just east of the town of Clayton. Drive to the end of Regency Drive and park along the street, taking care to not block residents' driveways.

Here are some tips for planning your hike:

Be prepared to hike approximately 6 miles (4 to 6 hours) with an elevation gain of over 1,000 feet. Allow plenty of time to return before sunset.

Use caution and wear appropriate footwear as trails and stream crossings may be muddy and slippery.

Consider bringing a change of clothes, especially shoes and socks, and a plastic bag in which to store the muddy items, so you don’t track mud into your vehicle.

Carry an accurate map of the area in case your plan or the weather changes.

 You may pick up a free Falls Hike handout/map or purchase a Trail Map of Mount Diablo State Park at the Mitchell Canyon Visitor Center onpdf-maps QR-code weekends from 9 a.m. to 3 p.m., or you may order a map from our online store. The trail map is also displayed in the Regency Gate display shelter at the Donner Canyon Road trailhead. A smartphone map with specific Falls Hike information can be downloaded for $2.99 using the QR code link or from
Get the app and then get the map by searching for “Falls Loop Hikes 2014”.
By purchasing a map, you are donating to Mount Diablo State Park.

Volunteer Maintenance Group Completes Its Latest Project

Macedo RestroomThe Volunteer Maintenance Group completed the remodel of the Macedo Ranch restrooms. The remodel included putting on a new roof and gutters, painting, adding ventilation, increasing lighting, and adding secure doors and screening to keep birds from nesting in the interior. Pictured are Jim Gray, Spencer Fulweiler, Steve Williams, Jim Mitchell and Steve Elliott.


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
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