Chalk Hill Road Bridge Replacement

prospective

The existing bridge that carries Chalk Hill Road over Maacama Creek is a one-lane structure built in 1915. It is a County landmark and is eligible for inclusion on the National Register of Historic Places. The existing bridge has deteriorated significantly and is vulnerable to earthquakes as well as foundation scour and erosion along the south creekbank. The bridge has been determined to be unstable in an earthquake, and is threatened by erosion. The County seeks to replace the bridge with a new two-lane bridge. Project Goals: Replace existing bridge with a bridge that meets modern design and construction standards Design a bridge that reflects local character and environment Improve safety and access for drivers, pedestrians, cyclists, and emergency services Community Outreach & Next Steps The Project Team has held three community outreach meetings at the Alexander Valley Hall to discuss the replacement of the Chalk Hill Road Bridge. February 19, 2019: First Community Meeting The purpose of the meeting was to: Describe the need for the project Describe the key project constraints Seek community input regarding future use of the existing bridge Seek community input regarding design of the replacement bridge Based on community comments at this meeting, there appears to be a consensus to: Remove the existing bridge Locate the replacement bridge near the existing alignment Keep design speeds low Minimize roadway width June 4, 2019: Second Community Meeting The purpose of the meeting was to: Review Community Meeting #1 Present conclusions drawn from community comments Provide project update Seek community input on design considerations Based on community comments at this meeting, the consensus is: Remove the existing bridge Build new bridge on parallel alignment Select the roadway configuration that meets use and safety requirements while minimizing impacts to the natural environment Bridge type concepts should reflect or enhance the rural bucolic setting October 1, 2019: Third Community Meeting The purpose of the meeting was to: Review Community Meetings #1 and #2 Present conclusions drawn from community comments Provide project update Present bridge type concepts and scour countermeasures for community feedback Based on community comments at this meeting, the consensus is for: Minimum structure width Low profile crossing that is subservient to surroundings Open barrier rail July 21, 2021 from 6pm-8pm: Fourth Community Meeting The purpose of the meeting was to: Review Community Meetings #1, #2 and #3 Provide project update Present selected bridge type Solicit input on architectural features Chalk Hill Bridge Elevation Chalk Hill Bridge North from South Approach September 13th ? 19th, 2021: Bridge Textures and Colors Exhibit Based on feedback from the 4th public meeting held July 21, 2021, the design team has organized an exhibit of proposed concrete colors and textures for the replacement bridge. The concrete color and texture samples will be on display on the porch of the Alexander Valley Hall (5512 CA-128, Geyserville, CA) from the afternoon of Monday September 13th through the evening of Sunday September 19th. Chalk Hill Bridge Concrete Samples Next Steps & Moving Forward: The next steps include formalizing bridge type selection, preparing a PS&E (plans, specifications and estimate), then completing and submitting the National Environmental Protection Act (NEPA) documents for review and approval. Final approval may require 18 months or more. Once the NEPA documents have been approved, the design will proceed to completion with intermediate reviews by County staff and Caltrans. Ideally, the project would be released for bids in the fall so that construction could begin the following spring.

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