Collapsible soils present significant geotechnical and structural engineering challenges forrndifferent types of constructions. These soils suffer volume changes and collapse deformationrnupon wetting. Situations in arid and semi-arid climates favor the formation of the mostrnproblematic collapsible soils. Almost all naturally occurring collapsible soil deposits are debrisrnflows, rapid alluvial depositions, and wind-blown deposits (loess). If unrecognized, it may causernpumps or deep sinkholes, which leads to traffic accidents and loss of lives. Hence, this researchrnwas conducted to investigate the physical properties and the severity of collapse of the soilsrnfound in the road project of Turmi - Omo.rnrnTo achieve the objective of this research, papers, journals, actual design reports, contractrndocument of the project and different books have been scrutinized under literature review,rnsamples from the research area were collected from different test pits below the natural groundrnlevel, and then laboratory tests for index properties and oedometer tests have been carried outrnusing disturbed and remolded samples. rnrnFrom the test results the subgrade soil classes fall in A-4, A-6 and A-7-6 according to AASHTOrnclassification. In addition, according to USCS the soils under investigation are classified as MLrn(group of inorganic silt of medium compressibility). The evaluation of susceptibility of soil torncollapse was measured by performing single oedometer tests on samples remolded at their in-siturndensities and at maximum dry densities. rn rnThe oedometer test results at the investigated depth of soil showed that, the collapse potential ofrnsamples remolded at their in-situ densities and natural moisture contents is within the range ofrn1.49 % to 5.93 % and that indicates that the severity of collapse is slight to moderate. And also,rnthe collapse potential of samples remolded at their maximum dry densities and optimumrnmoisture contents is within the range of 0.19 % to 0.495 % and thus the severity of collapse isrnvery slight. Though the results indicated that the severity to collapse is very slight, the soil in therninvestigated section is collapsible and the collapse potential could be significantly reduced byrncompaction during construction.