The paper describes the results of the monitoring of an elevated steel water-tank with unusualrnshape, 85 m high and 40 m wide. The research was carried out analysing both the static and dynamicrnbehaviour under wind actions. The instruments used (some of which were employed for the first time forrnthis project) are described and the data processing procedures are discussed. Comparison between thernexperimental results and those obtained through a numerical model gives interesting information both onrnthe structural behaviour and on the characterisation of wind actions.