Internal erosion is a major concern to the design and operation of earth structures when seepage occurs through or beneath these structures. An essential part of the design process is to select adequate engineered fill that can resist the internal erosion. One of the materials that is available in large quantities, yet with poor engineering properties, is sediments drudged from river streams. In this research, a simple apparatus was developed to evaluate the internal erosion of sediment materials drudged from the Euphrates River after treatment with cement and polypropylene fibers. The apparatus designed to conduct the hole erosion test (HET) on specimens treated with cement at 0.5, 0.75, 1, 2, and 4% and specimens treated with cement and polypropylene fibers (PPF) at 0.5%. The results indicated that the untreated soil cannot be used for earth structures that are exposed to erosion because of the high degree of erodibility. However, adding cement to the soil highly increased the internal erosion resistance and decreased the flow rate. Furthermore, when the PPF was added to the cement-sand mixtures, additional resistance to erosion was observed. As discussed herein, as far as internal erosion is a concern in earth structures, dredged sediments stabilized with cement and PPF can be used as engineered to provide high resistance to internal erosion.