The Sierra de Guadarrama National Park priority is the maintenance of the excellent ecologic quality of the Sierra de Guadarrama fluvial courses, through the Research, Tracking and Evaluation Center at the Madrid Autonomous Community, the OPAN Valsaín Mounts Center and the Castilla León Autonomous Community Parliament.
It is a very representative natural system, which only within the National Park lodges more than 337 kilometers of water courses and riparian forests, constituting the main Madrid and Segovia water sources. At the National Park heights are located the sources of the Sierra de Guadarrama main and more emblematic rivers, being also the main water supplies river basins of Madrid and Segovia Cities.
The Sierra de Guadarrama fluvial courses Ecologic Tracking Network objectives are, on the one hand to detect those reaches where the ecologic quality could be altered, and then undertake the necessary management and restoring measures, which means to evaluate the usages and preservation compatibility. On the other hand, to become the tracking system for the National Park preservation objectives, through highly useful and applicable indicators for the National Park Tracking Plan. In a long term basis it is becoming a reference ecosystem as a Global Change Observatory in the Sierra de Guadarrama.
The Tracking Network is constituted by 34 sampling stations in the Sierra de Guadarrama scope, including the main rivers (Lozoya, Manzanares, Guadarrama, Eresma, Moros, Cega and Pirón) and as well their main tributaries. The Tracking Network evaluates 24 fluvial courses, not only the previously mentioned main rivers, but as well important streams such as Peñalara, Aguilón, La Venta, Navalmedio, Navacerrada, Majadillas, Santa Ana, Santa María, Cambrones and La Acebeda among other.