2015 Map of Tassajara

About this map

Tassajara sits at the convergence of mountain ridges and creek beds along the Contra Costa and Alameda County border. This survey reveals a landscape defined by deep drainages and high points like Oyster Point and the Black Hills, where the transition from high ridgelines to the valley floor is marked by winding thoroughfares such as Camino Tassajara. The map provides a look at the rural canyon economies of the East Bay, showing the importance of local water sources like Sycamore Spring and the complex network of seasonal creeks including Marsh Creek, Sycamore Creek, and Tassajara Creek. Evidence of early land divisions is clear in the Cañada De Los Poblanos and the varied terrain of Round Valley, which serve as landmarks in this traditionally ranching-oriented region between Riggs Canyon and Doolan Canyon.