The 1:250,000 Hypsography datalayer contains elevation contours at a 30-foot interval. Available for the entire state, it was created by MassGIS from Defense Mapping Agency (now the National Imagery and Mapping Agency) data as reformatted by the USGS National Mapping Division. The SDE and shapefile versions are named CONTOURS250K_ARC.
NOTE: It is essential that these data be used at a regional scale consistent with the scale of the source data which is 1:250,000. Not all the contours will line up with such MassGIS data layers as the shoreline, the hydrography or the basin lines. Caution should be exercised in producing graphic output. Some significant features are missing from the original data. For more detailed elevation data, use the Elevation Contours (1:5,000) datalayer (CONTOURS5K_ARC).