The Model Inventory of Roadway Elements (MIRE) is a listing of roadway features and traffic volume elements to help agencies move toward data-driven decision-making in safety management. The Federal Highway Administration (FHWA) selected two lead agencies, New Hampshire and Washington to test the feasibility of collecting MIRE data. This report documents the effort to develop an intersection inventory for each lead agency, including development of the data collection tools, the challenges faced, and the lessons learned. These lessons are applicable to other agencies interested in improving their roadway inventory data to support their safety programs through data-driven decision-making.