Is There an IAD United Arrivals (or any Lounge with Showers) lounge?

I am flying UA business class from Rio de Janiero to Washington Dulles next month and want to know if there is an arrivals lounge with showers and food on offer? I fly Y later that day from DCA to EWR and then business class overnight to BFS on United.

Could not find any details on UA website.

Thanks in advance for your help.