This is the first airport along the Mississippi river that I plan to build for MSFS 2020 (If my health allows me).
The Bemidji regional airport is located near the lake and city of the same name on Beltrami county. Not too far from the Mississippi river origin at Itasca lake. A portion of the river percours inside the Bemidji lake.
I developed the MSFS 2020 version using only stock assets until SU14 with all the free actualizations. The package contains the airport, charts and info.