Three countries in the Amazon basin regularly publish a report about the hydrological conditions of the Amazon rivers in their territory:
Bolivia: SENAMHI (Bolivia) report. Select the report according to the date.
Peru: SENAMHI (Peru) report. Select on the map or in the station list.
Brazil: CPRM-Manaus report. Go to “Bacia do Rio Amazonas/Monitotamento Amazônia Ocidental”.