I seems SS4 does not recognize the prj file from Arc, even though Ustn knows about nad83 2011 projected system,
when referencing the re-project option does not display
prj data below
PROJCS["NAD_1983_2011_StatePlane_Washington_South_FIPS_4602_Ft_US",GEOGCS["GCS_NAD_1983_2011",DATUM["D_NAD_1983_2011",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Lambert_Conformal_Conic"],PARAMETER["False_Easting",1640416.666666667],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",-120.5],PARAMETER["Standard_Parallel_1",45.83333333333334],PARAMETER["Standard_Parallel_2",47.33333333333334],PARAMETER["Latitude_Of_Origin",45.33333333333334],UNIT["Foot_US",0.3048006096012192]]
This also is not recognized
NAD_1983_CORS96_StatePlane_Washington_South_FIPS_4602_Ft_US
This is recognized
NAD_1983_StatePlane_Washington_South_FIPS_4602_Feet
End