Collapsible Soils, unlike many other types of problematic soils found in Ethiopia,rndid not get the necessary attention in researches conducted to this date. However,rndue to their particular engineering characteristics, they exhibit large settlementrnupon wetting posing threat to embankments and foundations built over them. rnDue to lack of researches on collapsible soils and the limited attention given inrnengineering design manuals of the country, many professionals in the constructionrnindustry fails to clearly understand their index and mechanical properties. rnThis research had the aim of assessing the index and mechanical properties ofrncollapsible soils found between Zeway and Arsi Negele towns by taking the ModjoHawassarnDualrnCarriagewayrnHighwayrnProject,rnLotrn3;rnZeway-ArsirnNegelernasrnarncasernrnstudy.rnrnTo this regard, a series of field and laboratory tests were conducted onrnrepresentative collapsible soil samples collected from the above-mentioned studyrnarea. Field density test has been conducted to determine the in-situ densities of thernsampling areas. Furthermore, laboratory tests like specific gravity, gradingrnanalysis, Atterberg limits, and moisture-density relationships have been carried outrnto determine their index as well as mechanical properties. In so doing, it wasrnobserved that the soils have very low in-situ densities, mainly consist of sands andrnsilts and low plasticity. rnMoreover, in order to investigate the collapse nature of the soil samples, collapsernpotential test has been carried out using one dimensional Oedometer by remoldingrnthe samples to their in-situ as well as maximum dry densities so as to perceive thernnature of collapsibility of the soils at their natural state and at their compacted state.rnAccordingly, it was found out that the soils have moderate collapse potential atrntheir natural state and does not exhibit any kind of collapsibility at their compactedrnstate.