Prunedale Drainage Improvements Project

Project Description

Caltrans proposes multiple drainage improvements within a 1.5-mile-long section of U.S. Route 101 in Monterey County from just north of the Crazy Horse Canyon Road/Echo Valley Road overcrossing (at post mile 98.8) to the northernmost intersection with Dunbarton Road (at post mile 100.3). Improvements will be implemented through various ways, including joint repair and/or a complete replacement, depending on the conditions at each location.

Existing culverts proposed for removal will be replaced with reinforced concrete pipes. For most of the project culvert locations, the scope of work includes upgrading the size of the culverts to a minimum of 24 inches in diameter to increase the discharge capacity and reduce the velocity of water flow. One 24-inch-diameter culvert will be replaced with a 30-inch-diameter culvert, and two others will be replaced with 36-inch-diameter culverts. Culvert replacements will use either the cut and cover method or the trenchless pipe jacking method. Existing drainage inlets will be replaced with new drainage inlets that meet current design standards. New flared end sections will be installed on the inlets and outlets of culverts as needed throughout the project limits to prevent erosion. Concrete headwalls will be removed and replaced as needed. Concrete spall repair will occur at the reinforced concrete box joints in one culvert (post mile 99.732).

The repair of shoulder embankment slopes that have been damaged by erosion will occur at the outlets of two culverts (at post miles 99.06 and 99.21). Two drainage channels will be graded to remove excess silt and vegetation at post miles 99.42 and 99.73.


Graphic of project location map 


Project Benefits


The purpose of this project is to replace or rehabilitate existing culverts in poor or fair condition to maintain the functionality of the culverts and protect the embankments and the roadway from potential slope or pavement failure.


As documented in the Drainage System Reports from the Culvert Inventory, culverts within the project limits show varying degrees of damage caused by corrosion, deformation, perforation, damaged inverts, shape loss, joint separation, undermined backfill, and overall deterioration. If culverts are allowed to deteriorate any further, future roadway failure is possible.


Estimated Funding Breakdown

Funding Source Funding Amount
Local Not Applicable
State $6,252,000
Federal Eligible (To Be Determined)
Construction Cost $6,252,000

Proposed Project Schedule

Process Date
Final environmental document to be completed August 2022
Right-of-way acquisition to be completed May 2024
Design to be completed December 2023
Advertise August 2024
Construction to begin November 2024
Construction to be completed November 2025


Project Contact

Aaron Wolfram, Project Manager
Phone: (805) 858-8451

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

District 5 Public Information Office
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.

Title VI Brochures

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