The greater part of the made is diagnoses of the trophic state of the main swamps of the Ebro, and they have allowed to update, in part, the contents of environmental Base of swamps of the CHE (1996). Also limnologic diagnoses have been made in two new swamps, in phase of filling: Rialb and the Val. This line has a great interest, at the present time, since it will serve as base of the works of implementation of the Directive Frame of the Water and of EUROWATERNET. In addition the knowledge of the trophic state of the swamps and the associated risks facilitates its environmental management