The need for improved geologic information is ever increasing as environmental and land-use issues continue to grow, with particular relevance to water resources. In northeast Illinois, bedrock aquifers are under regional stress and Lake Michigan sources are nearly fully allocated. Thus, McHenry County has responded with proactive water-resources planning. In cooperation with the County, the ISGS is in the final stages of completing a county-wide 3-D geologic model of the glacial deposits, which include the shallow sand and gravel aquifers.