As sea levels rise, the future of salt marshes is in question. For a marsh to survive, it must keep up by adding sediment and organic matter to increase its surface elevation. We will demonstrate the use of a sediment elevation table (SET) which, coupled with high precision surveys by GPS, measures sediment accumulation on the marsh. We will also show an eddy flux tower that measures carbon dioxide exchange between the marsh and the atmosphere, the balance of which tells us whether carbon (as organic matter) is accumulating in the marsh.