Infrastructure asset management is a framework for achieving sustainable infrastructure. Based on this framework, although we often generate a three-dimensional (3D) geometrical model as a base map in management, it is not easy to acquire details of asset attributes in 3D measurement. Therefore, we focus on field-based investigation and inspection using mobile devices, and aim at assisting investigators in infrastructure asset monitoring with location-based applications. In this paper, we propose and evaluate our location-based investigation application as follows. First, we propose an inspection flow suitable for field-based monitoring. Second, we develop a Web GIS application for field-based investigation with mobile devices. Third, we propose base map generation suitable for sabo facilities using UAV and terrestrial laser scanner. We conduct an experiment in a sediment-retarding basin consisting of dikes, bridges, and debris barriers, and explore some issues in infrastructure asset monitoring using mobile devices.