The essential objective of any engineering project should be aimed at providing solutions that allow the well-being and improvement of the living conditions of the inhabitants of the project area, in such a way that the interventions carried out are environmentally friendly and allow the sustainability of natural resources over time.Many of these projects, due to the impact they generate, must be periodically monitored to accurately verify the positive or negative changes that they may have generated after their construction.One type of project of great interest due to its high impact on the environment and on people is dams or reservoirs, which significantly change the environmental conditions upstream and downstream of the waterways in which they are located.The changes can be so significant that they could devastate rivers, threaten the survival of surrounding fauna and flora, destroy surrounding valleys, flood large areas of wetlands, forests and agricultural lands, displace populations or leave many of them in imminent danger, before a possible collapse of the structure.The purpose of this document is to present a database that contains variables directly related to the effects produced by the installation of the Urrá reservoir, located in the channel of the Sinú river, in the north of Colombia.The information corresponds to historical data from seven consecutive years of follow-up, from 2008 to 2014.It includes the following physicochemical parameters: Biochemical Oxygen Demand (BOD5), Dissolved Oxygen (DO), Temperature and pH, taken in seven stations located along the channel of the river Sinú.The data set helps to perform simulations to determine the quality of the water flowing through the river and to verify whether the reservoir project has had an influence on the pollution of the stream.In a complementary way, these data help to understand the biological interaction that is generated between the organisms that inhabit the area and determine if the environment has been altered.