Reconstructing the four-ramp full cloverleaf interchange at Highway 101 and Holly Street in San Carlos into a safer and higher-capacity partial cloverleaf has just become $4 million more expensive, according to an updated project budget approved the San Mateo County Transportation Authority (SMCTA)’s December 7 Board of Directors meeting. Cost estimates jumped from $15 million in 2015 to $17.5 million this year. On top of that an additional $1.5 million in supplemental contingency funds was approved.
Those costs don’t include the $7.5 million pedestrian bridge component of the project, which is fully funded from other sources. The partial cloverleaf and pedestrian over-crossing construction project will go out to bid as one project in January 2018, saving an estimated $1.5 million compared to constructing them as two projects at different times.