Driveway bridges in the Oakland and Berkeley Hills face several common problems due to the region’s terrain, geology, and climate. Some major problems are as follows:

1. Soil Instability & Landslides

The steep hills and underlying soils (like clay and fill) are prone to erosion and landslides, especially after heavy rains or earthquakes. Bridge supports may shift or fail due to ground movement.

2. Earthquake Vulnerability

The proximity to the Hayward Fault means seismic activity is a major risk. Older bridges may lack modern seismic reinforcements.

3. Drainage Issues

Poor drainage design can lead to water pooling, dry rot damage to supporting structures or erosion around bridge footings.

4. Aging Infrastructure

Many driveway bridges are decades old and were not built to current codes. Materials like untreated wood or rust-prone steel deteriorate over time. Also the dimension of structural lumbers used are not per code and susceptible to collapse under the vehicle load