Mortar Rock Park

Geological Features

Mortar Rock Park features a large rhyolite rock formation, which gives the park its name. These rocks are composed of Northbrae Rhyolite, a type of igneous rock unique to the Berkeley Hills.

The park's name derives from the numerous hollows or mortars worn into the rock by Native American women who used the area for grinding acorns and other seeds into meal. These mortar holes serve as a tangible link to the area's indigenous history and are still visible today.

Climbing History

Mortar Rock Park, along with nearby Indian Rock Park, played a significant role in the development of rock climbing and bouldering. In the 1930s, these parks became popular spots for early climbers to practice their skills, contributing to advancements in climbing techniques.

Today, the park remains a favored destination for rock climbing enthusiasts, particularly those interested in bouldering.

Location and Views

Covering an area of approximately 0.39 acres, this small but significant public space is located in the Northbrae area of Berkeley, California. The park offers panoramic views of the San Francisco Bay, making it a popular spot for visitors to enjoy sunsets.

It is nestled in a residential neighborhood, providing a natural retreat for local residents and visitors alike. The park was originally gifted to the City of Berkeley by the Mason-McDuffie Real Estate Company in 1917, as part of the development of the Northbrae area.

Natural Environment

While small in size, Mortar Rock Park is rich in natural beauty, featuring native oak and bay trees that provide shade and habitat for local wildlife.

The park's geological and cultural significance, combined with its recreational opportunities, make it a unique and valuable part of Berkeley's park system.