We report quantitative in-situ measurements of irradiation-induced creep deformation under heavy-ion irradiation. Cu₅₆Ti₃₈Ag₆ amorphous micropillars of 700 nm diameter and 2 μm height were irradiated with 2.3 MeV Ne⁺ ions under uniaxial compression at room temperature. Amorphous samples were prepared by ball milling and subsequent hot compression; and micropillars were milled by focused ion beam. The in-situ tests were performed by utilizing a custom setup that consists of a microfabricated silicon beam force sensor, an interferometric laser sensor, and a nanopositioner. The silicon beam provided the applied force. The stress and strain on the micropillar was calculated from the laser sensor measurement of silicon beam deflection, the nanopositioner position, and the calibrated silicon beam spring constant. The applied stress in the range 10-100 MPa resulted in Newtonian flow. The measured radiation-induced fluidity values are in good agreement with the previous molecular dynamics simulation result of 3×10^-9 Pa^-1dpa^-1.