Once completed, the road will connect the 241 Foothill Transportation Corridor to the 5 freeway.
Officials said the $25 million project will provide a crucial link for several southern Orange County communities.
Construction is expected to be completed in a little more than a year.
Do you want the Eyewitness News team to call you? Get a FREE Morning Wake-up Call and personalized weather report at abc7.com/wakeup