Three bridges have been determined to need preventive maintenance to extend their useful lives and to prevent their further deterioration.
Canyon Road Bridge
The Canyon Road Bridge was reconstructed in 1998 as a one-lane concrete bridge connecting Canyon Road to Cascade Drive over the San Anselmo Creek. The bridge is 33 feet long and 12 feet wide, with an asphalt surface. Nestled in a residential neighborhood, the bridge carries small utilities and has some graffiti and painting on bridge abutments. The bridge is intended to remain open during the repairs since a detour is not available between Canyon Road and Cascade Drive. However, there may be times the road will need to be partially closed during the day for construction. Construction is not anticipated until late 2014 or early 2015.
Anticipated Repairs
- Replace concrete sack wingwall with integral reinforced concrete wingwall
- Fortify the downstream wingwall on the same side
- Repair concrete surface at left abutment wall (looking downstream)
- Protect the deck with polyester concrete
- Repair superstructure concrete spalls
Marin Road Bridge
The Marin Road Bridge, built around 1930, is a two-lane bridge approximately 27 feet long and 27 feet wide. The Bridge is in a residential area, connecting Olema Road with Sir Frances Drake Boulevard (SFDB), a major arterial. The bridge is generally in fair condition, with some graffiti visible. During repairs (2015), the bridge may be partially closed during daytime working hours for a few days.
Anticipated Repairs
- Repair and patch spalls at one bridge abutment
- Replace toppled wingwall
- Repair two other damaged wingwalls
Spruce Road Bridge
Built around 1930, Spruce Bridge is approximately 22 feet long and carries two lanes of traffic, with narrow sidewalks on both sides. The bridge connects Spruce Road to Arroyo Road, which leads to Sir Francis Drake Blvd. Both the creek and the bridge corners are tightly encroached upon. During repairs (2015), the bridge may be partially closed during daytime working hours for a few days.
Anticipated Repairs
- Protect abutment footing and repair foundation erosion
- Place a polyester concrete overlay on the roadbed
- Repair soffit spalls and abutment damage
- Replace joint seals
Download Bridge Preventive Maintenance Program Fact Sheet ▼
Updates
August 2024:
- The last of the project’s environmental studies reports, the Historic Property Survey Report (HPSR), will be submitted to Caltrans shortly in August 2024, paving the way for National Environmental Policy Act Categorical Exclusion (NEPA CE) certification of the project
- The project’s Draft Administrative California Environmental Quality Act’s Initial Study / Mitigated Negative Declaration (CEQA IS/MND) was submitted to the Town in July 2024. The town submitted comments on the document, which are currently being addressed by the consulting team. After this process, the final document will be circulated for a 30-day public review and comment. Its publication venues and dates will be posted.
- After the environmental certifications, the project will kick into its final phase, Right-of-Way (ROW), Utilities and Final Design. There are no ROW impacts except that temporary construction easement agreements with one or two adjacent homeowners may be necessary.
- Additional details, such as the project advertisement and construction dates and durations, will be posted soon.
September 2016: