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How to reduce the size of a contour shapefile?

Question asked by RC123 on Jul 22, 2017
Latest reply on Jul 23, 2017 by RC123

I am using the latest version of ArcMap for desktop.  I have a shapefile which is contour lines.  I have two shapefiles for adjacent areas of a map.  One of the shapefiles has double the number of contour lines as the other shapefile.  I understand that I can display a reduced number of contour lines by using a definition query, but I would like the actual file to contain fewer lines and be more similar to the other shapefile. Any advice on how to do this is greatly appreciated.

The shapefile I want to reduce contains 673,835 lines in the attribute table and is 125 MB