The following is a list of monitoring sites at which water quality data is (or was, or will be) collected. The sites were selected in conjunction with National Marine Fisheries Service (NMFS) primary investigators in the smolt monitoring program. Site selection criteria included the ability to determine environmental information to aid characterization of temporal distributions, abundance, and behavior of anadromous fish at various lifestages. Baseline water quality and hydrologic information to support these characterization studies was the first objective of this program.