Change the elevation of a certain area in a DEM

[VasilikiPoulimenakou]

Hello, 

I have prepared a DEM for a certain location, representing a river reach. I want to change the elevation of the river channel only, while keeping the elevation of the rest of the DEM at the same values as before. It would be greatly appreciated if you were able to help me. I am using ArcGIS. 

[MarkBockenhauer]

This thread may be of interest: https://community.esri.com/thread/121172