The U.S. continues to face the challenge of correctly identifying underground utilities before beginning a construction project. Having accurately mapped utilities and knowing their location will increase efficiency in the construction process, reducing accidents and utility interruptions. A methodology to integrate Global Positioning System (GPS) and laser technology will be outlined. This process will assist field technicians in collecting underground utility field location data, accurately and consistently, in a minimal amount of time, with less effort, while maintaining maximum safety. It will also form a framework to develop a permanent data solution in which data collected can be stored in a database and retrieved in a three dimensional geo-referenced map for future use. This research focused on utilities which were installed using an open trench method. The integrated technology was tested under construction field conditions. The results of the research indicate that utility data can be collected quickly and cost effectively through this process. The positional accuracy of underground utilities was mapped in three dimensions (3D) within ± 0.45m accuracy. Copyright ASCE 2010.