The Park Authority of New York and New Jersey had planned to build a new bridge to Hudson due to increased transportation demand. New York State governors have canceled the first proposal for the Tappan Zee Bridge. Some of the reasons led to postponing the date and changing the location of construction. So, the construction of the Tappan Zee Bridge began in 1952. The Tappan Zee Bridge was designed as the largest cantilever bridge in the United States of New York. The bridge connects South Nyack in Rockland County to Tarrytown in Westchester County in the Lower Hudson Valley. The total length of the bridge is 4,881 m and its cantilever span is 369 m. It has seven lanes for vehicles and the central lane, which can be changed between different limits thanks to a movable barrier. The bridge opened to traffic in 1955. The governor of New York State signed a bill into law in 1956. Engineers involved in this project said the bridge was built on the cheap in the 1950s Its cost was less than $81 million because it was used as an on-farm design. It is less expensive than the arch at its originally designed main span. These design changes resulted in more infrastructure risks and bridge weakness. In 2009, infrastructure problems arose in the United States. It has been called "one of the most decrepit and potentially dangerous bridges"[1]. Engineers reported that the claims about the bridge were true. The bridge was not intended for long-term durability. Thus, this situation gives rise to new projects to repair the bridge or build a new bridge or tunnel. The Metropolitan Transportation Authority is studying the possibility of including the rail line on the replacement bridge or setting future dates. If built, the rail line will connect to the other line...... middle of paper ......ect. The objective of the commitment is to minimize the discharge of sediment into the river, respecting water quality parameters and reducing adverse effects. Additionally, project actions may affect different types of fish. Therefore, builders must have authorized in-water construction activities in the Hudson River. The construction company did not have much information about the environmental impact of building the existing bridge. However, better water quality management minimizes impacts on the Hudson River. In conclusion, “the New York State Thruway Authority desires to ensure efficient, safe quality and timely completion of the construction project to replace the Tappan Zee Bridge”[2]. Despite the many environmental impacts of the project, the benefits are numerous for transportation, safety and public well-being..