TPW Roads

Chalk Hill Bridge Replacement

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.

The bridge replacement is funded by the Federal Highway Administration under the Highway Bridge Program, which is administered by Caltrans.

June 4, 2019 – Second Public Meeting

A second public meeting toke place June 4, 2019 from 6:00 pm to 8:00 pm at the Alexander Valley Community Hall. The hall is located at 5512 State Hwy 128 in Geyserville, CA.

The purpose of the second public meeting was to review the first public meeting and to seek input from the public regarding architectural features of the new bridge.

The public are encouraged to ask questions and to:

  • Provide general comments on the project,
  • State how they will use the replacement bridge, and
  • The architectural “metaphors” they associate with this crossing

Members of the design team will be available to answer questions from the public.

February 19, 2019 – First Public Meeting

The first public meeting took place February 19, 2019 at the Alexander Valley Community Hall. The purpose of that meeting was to:

  • Describe the need for the project,
  • Describe the key project constraints,
  • Seek public input regarding future use of the existing bridge, and
  • Seek public input regarding design of the replacement bridge

Based on public statements at this meeting, it appears that a consensus is building to:

  • Remove the existing bridge,
  • Locate the replacement bridge near the existing alignment,
  • Keep design speeds low, and
  • Minimize roadway width.

Those public comments enabled the design team narrow the focus of their site investigations and to eliminate some of the alternatives from the engineering studies and to refine others.

Contact Information

Business Hours
Monday – Friday
8:00 AM – 5:00 PM
Contact us by Phone
Office Location
La Plaza B
2300 County Center Drive
Suite B 100
Santa Rosa, CA 95403
38.462023, -122.725381

Standard Plans

Construction Standards for County Roads


Standard plans for construction of roads and related structures.