The existing State Route 160/Highway 4 interchange currently includes only two of the four possible interchange movements: the eastbound Highway 4 to northbound State Route 160 connector ramp, and the southbound State Route 160 to westbound Highway 4 connector ramp. The State Route 160/Highway 4 Direct Connector Ramps project will construct two new connector ramps, one connecting westbound Highway 4 to northbound State Route 160, and one connecting southbound State Route 160 to eastbound Highway 4.
The project scope includes adding an additional 12-foot auxiliary lane to the outside of existing State Route 160 in both directions between the State Route 160/Highway 4 Interchange and the East 18th/Main Street Interchange, as well as building a soundwall extension and retaining walls.
Construction began in March 2014 and is expected to be completed winter 2015/2016, weather depending.
I recently toured the project with Ivan Ramirez, Contra Costa Transportation (CCTA) Authority Construction Manager. CCTA is a public agency by created Contra Costa voters in 1988 with the passage of Measure C to manage the county’s transportation sales tax program and provide countywide transportation planning and congestion management. It provided for a half-cent sales tax increase for twenty years (through March 2009). In November 2004, Contra Costa County voters approved Measure J with a 71% vote. The measure provided for the continuation of our county’s half-cent transportation sales tax for 25 more years.