Berryessa Creek is a seasonal creek in northeastern San Jose and Milpitas. Its main source is located in the Los Buellis Hills slightly west of Felter Road. Berryessa Creek has many tributaries, including Piedmont Creek, Calera Creek, and Penitencia Creek. In the summer, Berryessa Creek is mostly dry except in Milpitas, where much of its water comes from urban runoff and tributaries. In winter, however, the creek can flood very high and pose a hazard for surrounding residences.