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Interchange work will cost Manteca $159M

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The McKinley Avenue interchange on the 120 Bypass is one of six interchanges proposed to receive funding from increased growth fees over the next 20 years.

HIME ROMERO/The Bulletin/

POSTED May 18, 2017 1:33 a.m.

Manteca will need to spend at least $159 million from local sources to pay for three new interchanges, upgrades to three existing interchanges and to widen overcrossings on Louise Avenue and Cottage Avenue to four lanes.
The funds will come from a pumped up transportation fee coming back before the City Council next month for adoption. It reflects growth’s fair share of the cost. Under state law growth cannot be charged more for fees to pay for infrastructure than what they create the need for proportionately. In the case of transportation needs the fees are based on the costs of needed improvements and dividing by average daily trips that uses such as single, family homes, retail, apartments, and business parks generate.
The $159 million is roughly 30 percent of the overall cost. Public Works Director Mark Houghton noted historically cities have obtained the balance for needed interchange work from regional, state, and federal sources.
That means the interchange and overcrossing work will ultimately cost in excess of $530 million.
New interchanges are proposed at McKinley Avenue on the 120 Bypass, for the future extension of Lovelace Road on Highway 99 between Lathrop and French Camp roads, and at the future Raymus Parkway interchange roughly midway between Jack Tone and Austin roads on Highway 99.
The city is not expected to have to contribute to the major revamp of the Highway 99 and 120 Bypass interchange along with the Austin Road interchange that could run as high as $80 million.
Widening of bridges and upgrading ramps are also planned at Union Road, Main Street, and Airport Way. The Union Road work could start as early as next year.
Overcrossings on Louise and Cottage avenues over Highway 99 would be widened to four lanes.
When all work is done, Manteca will have four interchanges on the 120 Bypass and five interchanges on Highway 99 in addition to the 120 Bypass/Highway 99 interchange.
The new growth fees also reflect $85 million for major road work and $62 million for intersection medications to bring the projected revenue from the increased fee to $306 million.
Intersection modifications are expensive as they involve traffic signals and widening right of way for additional turning lanes that require property acquisition.
The major road work is actually significantly higher in terms of cost but the dollar amount only reflects the center lanes of four lane roads as the outside lanes, sidewalks as well as curb and gutters are picked up by developers when they build subdivisions. The fee also reflects the cost for sections of major roads where no development is anticipated to cover the cost of the outside lanes so gaps aren’t created as has happened on Louise Avenue east of Main Street where it goes from four lanes, down to two lanes, and back to four lanes.

To contact Dennis Wyatt, email

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