Lot 25

/Lot 25

Lot 25


4.98 acres 


Mount Diablo Creek Watershed. Lot 25 includes 500 feet of Mount Diablo Creek, which flows off the north slopes of Mount Diablo and travels north-easterly for approximately 17.24 miles before reaching its mouth in Suisun Bay.   

Vegetation habitats

Oak woodland, grassland, and riparian habitats with maple, cottonwood, sycamore, oak, buckeye and willow trees.  


Donated to Save Mount Diablo in 2012 with the cooperation of the City of Clayton as mitigation for building the Diablo Estates subdivision.   


Site of the former Claretian Monastery, Lot 25 has been planted with over a hundred live oaks and valley oaks and has potential to be a neighborhood entry way to Mt Diablo State Park. 

After ten years of work we have just protected a significant missing link of Mt. Diablo Creek. Beginning in 2003 we worked with the City of Clayton on a development project: 24 lot Diablo Pointe. A remaining parcel,“Lot 25” is 5 acres including a section of creek. Its preservation is important and precedent setting in several ways.

During the development planning process, we focused on protection of the creek corridor, oak woodland and a canyon along the eastern boundary as well as buffers to the State Park on the east and south. The most significant precedent in the agreement with the developer was that a caretaker house along the creek was to be removed and the riparian corridor replanted.

lot-25-by-scott-heinOn Dec. 21, 2004 the redesigned Diablo Pointe project was approved. When the developer asked the State Park to accept Lot 25 in 2011, the Park rejected the offer due to budget cuts. We then worked with the developer and the City to transfer the property to Save Mount Diablo for preservation. We will take care of the property until the State Park is able to accept it and make it part of the Park.

The property has a high quality, incised rock bottom, 500 feet of Mt. Diablo Creek with intact riparian vegetation including maple, cottonwood, sycamore, oak, buckeye, and willow trees. It’s lovely and overgrown, shifting between pools of water and rocky ripples. The old house site and flat area along the creek are now studded with straight lines of plastic tubes protecting 150 live and valley oak trees planted to restore the corridor. Our volunteer stewards will care for the trees and do additional restoration.

Read the full article on Lot 25 in Diablo Watch.

Save Mount Diablo’s properties are closed to the public except by guided tour.

All green areas are protected lands. The section in red is Save Mount Diablo’s Lot 25 which had a previously unprotected segment of Mt. Diablo Creek.