The Swiss Federal Office for the Environment operates the data portal www.hydrodaten.admin.ch. The portal contains current and historical hydrological data on rivers, lakes and groundwater in Switzerland as well as forecasts and flood warnings (data on discharges, water levels, water temperature, groundwater).
daily
minutes to hours
244 Stations 514 Sensors
Data provided by: Bundesamt für Umwelt (BAFU) - Schweizerische Eidgenossenschaft. Legal information: https://www.bafu.admin.ch/dam/bafu/de/dokumente/hydrologie/fachinfo-daten/allgemeine_bedingungenfuerdasherunterladenaktuellerhydrologische.pdf.download.pdf/allgemeine_bedingungenfuerdasherunterladenaktuellerhydrologische.pdf