Concrete has been proved to be variety one construction material for over a century. It's a material produced by the homogenous mixing of selected proportions of water, cement, fine aggregate, and coarse aggregates. Strength is that the foremost desired quality of wonderful concrete. It should be strong enough, at hardened state, to resist the varied stresses to which it would be subjected. the mixture element in concrete comprises 60-75% of the whole volume. because of the heavy increase within the event activities, the crushed granite stone which is that the quality coarse aggregate is under depletion. Nowadays, an acute shortage and high cost of those materials are experienced. Additionally to its huge amount of quarry dust being produced during the tactic of quarrying and production that results in many environmental problems and human diseases. Hence, an alternate for the crushed granite stone has got to be explored. the current investigation envisages the potential utilization of river stone as a rough aggregate in replacement of crushed stone aggregate in C-25 concrete. Tests on the physical properties of river gravel and its influence on the strength of the fresh and hardened state. From the test results, the bulk density of RG found to be 1730kg/m3 , specific gravity was 2.7, water absorption was 2.1% and the moisture content was 0.9%. Concrete mix design was administered and also the combo ratio obtained was 1:2:3. and blend compositions were calculated by absolute weight method. An entire of 90 standard concrete cubes (150 mm x 150 mm x 150 mm) was cast and monitored at 3, 7,28 and 56 days respectively. Concrete mixes with 0%, 25%, 50%, 75% and 100% replacement to crushed stone aggregate were considered during this study. the combination proportion was done as per ASTM (2005). The properties of fresh and hardened concrete were studied on the mixes considered. The results showed that there's a rise in slump value and strength properties. The appropriate result which satisfies the design strength was obtained when crushed aggregate was partially replaced up to 50% with river gravel which was 33.67N/mm2 at 28 days on compressive strength. As a result, the utilization of river gravel can be considered for concrete production