Its main source is located in the Los Buellis Hills slightly west of Felter Road.

The various forks are located mostly in undeveloped hills owned by a local water department and are used for cattle grazing.

Piedmont Creek has three or four forks beginning at private ranch properties in the eastern foothills in Milpitas.

Now in Ed R. Levin County Park, the creek keeps going west and then winds downhills with Calaveras Road by its side.

Calera Creek begins at north Ed R. Levin County Park from a number of springs from the west side of the Monument Peak ridge.

As an artificially created ditch, it then traverses through a number of housing developments and passes Milpitas High School.

When it was converted into a ditch in the 1960s to prevent flooding the newly constructed housing developments, the creek lost almost all of its fish .