river registered its lowest ever level since official records began in 1998 and in the acre state capital rio branco the acre river which cuts through the city reached its lowest level since measurements started in 1967 according the brazilian geological surveythe drought in the amazon river is not as extreme so far although coari a city close to tefe is enduring its sixth worst drought since records began in 1975as climate change causes extreme weather events significant droughts in the amazon is likely a sign of such changes alejandro duarte a climate researcher at the federal university of acre told the ap this could be an irreversible trend in coming years