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I downloaded the DEM data from USGS. It comes with several raster files in .img. I know that a mosaic tool can merge them together. I found a lot of tools in the mosaic toolset.

Which one should I use?

  • What version of Arc Desktop are you using? – enolan Jul 23 '18 at 19:50
  • If you really only have a few rasters then mosaic to new raster should suffice. As you have provide no information about the rasters other than it's file type that's about as good as I can offer... – Hornbydd Jul 23 '18 at 21:06
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You are on the right track, but you don't want to use the tools in the Mosaic folder. Instead, using ArcToolbox navigate to "Mosaic to New Raster".

Arc Toolbox > Data Management Tools > Raster > Raster Dataset > Mosaic to New Raster

All of the files you are manipulating should have the same cell size because they are all from USGS, but I would double check prior to using the mosaic tool by looking at the properties of each of your layers.

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