This data release contains well yield and ancillary data for 7,287 bedrock wells used in an analysis of bedrock well yield in the Nashoba Terrane and surrounding area in eastern and central Massachusetts. The data release also contains Geographic Information System (GIS) data layers of lineaments delineated from aerial photographs and digital elevation data for a part of the Nashoba Terrane study area. Ancillary data consist of well depth; bedrock geology, surficial geology, topographic setting, and wetlands at the well ___location; distance of the well to hydrologic and geologic features; and distance of the well to lineaments. The data were interpreted in U.S. Geological Survey Scientific-Investigations Report 2012-5155, and a data layer of estimated well yield in 200 by 200 meter grid cells throughout the Nashoba Terrane and surrounding area, based on kriging of yield data from the 7,287 wells, is included in the data release. The data release contains 4 separate items: 1. Well yield and ancillary data for 7,287 bedrock wells 2. Well locations 3. Lineaments in a part of the study area 4. Estimated bedrock well yield from kriging of well yield data These data are associated with the following publication: DeSimone, L.A., and Barbaro, J.R., 2012, Yield of bedrock wells in the Nashoba terrane, central and eastern Massachusetts: U.S. Geological Survey Scientific Investigations Report 2012-5155, 74 p., available at http://pubs.usgs.gov/sir/2012/5155