Bridge scour disasters have often happened in Taiwan in recent years. It causes a lot of damage to human life and people's property during major storms. Although we could not foresee when a bridge scour hazard will occur, we can predict where will easily trigger disaster, if proper expert-based evaluation is performed on time. The aim of this study is to build up a user-friendly expert system of bridge scour potential evaluations by integrating a Graphic User Interface (GUI) with a Database Management System (DBMS), an Expert System (ES), and a Geographic Information System Object (GIS Object). Through case verifications, we have certified this expert system is suited to assess the risk of potential bridge scours for pre-warning and hazard prevention purposes.