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Roads should be safe and kept in good condition. In order to carry out effective road maintenance, the use of spatial and temporal information is necessary. As research in this field, a web-based road maintenance support system has been in long-term operation. However, in the existing system, the accumulated data is not intended for use in future work. The maintenance information produced over the life cycle of a road is instead distributed among multiple computers and management offices. In this paper, a prototype of information portal system using Web GIS is proposed and evaluated in terms of its practicality for project participants to retrieve and to share information. Road data models containing structural and work information are constructed for use in the system. The system includes functions for data analysis from the viewpoint of budget and maintenance, provides aerial views on Web GIS, and contains spatial analysis results using GIS.