This memo communicates the Lake Erie Partnership Research and Monitoring Priorities for the CSMI Field Year on Lake Erie 2019 along with background on the current knowledge of the state of Lake Erie and the process used to establish these priorities The Lake Erie Partnership looks forward to working with the Annex 10 CSMI Task Team during 2018 to develop more specific research and monitoring plans to fulfill these science priorities as resources for the 2019 field year allow. A Lake Erie Lakewide Action and Management Plan will be developed in 2018 and its contents will include the finalized science and monitoring priorities.