LOWEST: On Monday, January 4, 1982, a devastating rainstorm struck the San Francisco Bay Area. Earth slides and flooding covered the highway and roads north of the Bridge. Two days later, on Wednesday, January 6, only 3,921 southbound vehicles crossed the Bridge. This compares to the average daily southbound count of 37,936 for January 1982.
HIGHEST: During the evening commute on October 17, 1989, the Loma Prieta Earthquake jarred the Bay Area with a force measuring 7.1 on the Richter scale. The Golden Gate Bridge withstood, undamaged, the most devastating quake to strike the Bay Area since 1906. During this time of myriad traffic problems, extra bus and ferry trips were added to help smooth the commute as a flood of 30,000 to 40,000 drivers were diverted from the East Bay to Highway 101 and the Golden Gate Bridge due to the failure of the San Francisco-Oakland Bay Bridge. On October 27, 1989, an all-time record of 162,414 vehicles crossed the Bridge north and southbound.