Santa Margarita 58 CAPM

Project Description

Caltrans proposes a 0.15-foot Rubberized Hot Mix Asphalt overlay within the project limits. Shoulder backing would be placed along pavement edges. The existing roadway has 11-foot-wide travel lanes with 1-to-2-foot shoulders. The project proposes to widen the roadway with 12-foot lanes near the north side of I Street (post mile 1.8) to West Pozo Road (post mile 3.15). Six-foot shoulders are proposed from I Street (post mile 1.8) to West Pozo Road (post mile 3.15). In this segment, sidewalks and curb ramps that meet accessibility requirements would be installed, and shoulders would be widened to provide more space for bicyclists. Existing asphalt concrete dikes would be upgraded to meet existing standards.

Culvert inspections have identified seven culverts that need to be repaired or replaced. Two residential culverts and one private driveway culvert would be replaced to accommodate roadside flow affected by the shoulder widening. One traffic count station would be installed. All existing metal beam guardrails would be replaced with the Midwest Guardrail System, the current standard.

Right-of-way acquisition is expected for shoulder widening and associated utility relocations.

project vicinity map

Project Benefits


The purpose of this project is to improve the ride quality of State Route 58 in San Luis Obispo County near Santa Margarita, extend the service life of the existing pavement, protect embankments and roadway from potential slope failure, maintain an efficient Intelligent Transportation System, improve the visibility of sign panels, improve multimodal access, and upgrade guardrails to meet current standards.


The existing pavement within the project limits is showing distress and unacceptable ride quality. If left uncorrected, it would continue to deteriorate. Culverts that would be replaced were found to have deficiencies, such as corroded inverts and shape loss, during field investigations and drainage inspections. Slope failure could result if these issues are not addressed. There is limited multimodal access and no existing sidewalk within the project limits. Cyclists currently share the travel lanes with motorized traffic due to limited shoulder widths. There are no traffic count stations within the project limits, which are necessary to collect reliable traffic flow information. The existing sign panels within the project limits do not meet current retro-reflectivity standards from the California Manual on Uniform Traffic Control Devices. In addition, the existing metal beam guardrails do not meet the current standards of the Manual for Assessing Safety Hardware.

Estimated Funding Breakdown

Funding Source Funding Amount
State $7,817,000
Construction Cost $7,817,000

Proposed Project Schedule

Process Date
Final environmental document to be completed Spring 2023
Right-of-way acquisition to be completed Spring 2024
Design to be completed Summer 2024
Advertise Fall 2024
Construction to begin Early 2025
Construction to be completed Late 2025


Project Contact

Luis Duazo, Project Manager
Phone: 805-835-6502

Matt Fowler, Senior Environmental Planner
Phone: 805-779-0793

Public Information Office, Caltrans District 5
Phone: (805) 549-3318


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Title VI Information

The California Department of Transportation (Caltrans) assures that no person shall, on the basis of race, color, or national origin, be excluded from participation in, be denied the benefits of, or be otherwise subjected to discrimination under any program or activity receiving Federal financial assistance, as required by Title VI of the Civil Rights Act of 1964, as amended, the Civil Rights Restoration Act of 1987, and Federal Executive Order 12898 (Federal Actions to Address Environmental Justice in Minority Populations and Low-Income Populations).

Caltrans will make every effort to ensure nondiscrimination in all of its programs and activities, whether they are federally funded or not, and that services and benefits are fairly distributed to all people, regardless of race, color, or national origin. In addition, Caltrans will facilitate meaningful participation in the transportation planning process in a nondiscriminatory manner.