Members of the Sediment Dynamics Group are slowly arriving in Brazil for our fifth tidal Amazon River cruise. Yesterday along with our Brazilian collaborators we measured discharge at the town of Obidos, the farthest downstream gauging station on the Amazon. Today we will measure discharge on the Tapajos River, a major tributary that meets the Amazon at the city of Santarem. Tonight we meet the rest of our UW and Brazilian colleagues and continue our research farther downstream.