Extensive deformations due to a mine waste dump-activated landslide necessitated temporary relocation of about 700 m section of Malkara – Hayrabolu State Highway located in the northwestern Turkey. This paper presents the design actions and measures quickly taken to stabilize this 510 m long, 250 m wide mass movement. Due to rapid mobilization of the landslide mass, it became necessary to estimate the position and properties of the sliding surface mainly through field observations and numerical methods. The analyses indicated that the required safety level under seismic loads could only be reached after an extensive amount of waste dump removal in addition to the construction of at least four rows of drilled shafts. Due to extensive cost of the drilled shaft-based remediation method, a less costly alternative that limits the damage to the highway under seismic loads was proposed.