An old Topo map from 1902 of Ventura and Ojai showing some of Matilija. You can clearly see that there is no Casitas Lake or Dam, same with Matilija.
A more modern map of the Matilija area. This is drawn from four different Topo maps of the area.
The red X points to a remote water fall.
Matilija double falls 1917
VenturaMap