Starting on March 2, 1998, the tunnel was reconstructed along with the cracked tunnel floor. This was done to correct a major water problem that had existed for many years due to the presence of the Harlem Creek and other underground streams, which caused extensive flooding, water damage, and seepage problems that occasionally contributed to severe service disruptions. The project cost and was finished on October 12, 1998. During the reconstruction, 3 trains were rerouted to the 137th Street–City College station on the IRT Broadway–Seventh Avenue Line. Supplemental shuttle bus service connecting to other lines in the area were provided for much of this time.