During the early years of the twentieth century, the Colorado Street Bridge was known locally as "Suicide Bridge" after dozens of suicides. A suicide barrier was added which reduced the number of suicides, but the bridge retained its nickname. In 1989, after the Loma Prieta earthquake in Northern California, the bridge was declared a seismic hazard and closed to traffic. It was reopened in 1993 after a substantial retrofit. The bridge is closed each summer for a festival, "A Celebration on the Colorado Street Bridge", hosted by historic preservation group Pasadena Heritage.