Rocklin Road Sierra College Corridor Multimodal Enhancements
Rocklin Road Sierra College Corridor Multimodal Enhancements
The City of Rocklin is studying the feasibility of reconstructing the Interstate 80 and Rocklin Road Interchange between Sierra College and downtown Rocklin to provide a safer connection for pedestrians, bicyclists, transit users, and motorists, and close the gap between communities caused by Interstate 80.
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A MULTIMODAL LINK
Rocklin Road is a prominent east-west vehicle-heavy roadway that runs perpendicular to Interstate 80 with narrow sidewalks, no shoulders, and no bike lanes. Since the construction of I-80 through Rocklin in 1958, the Sierra College area has been disconnected from downtown Rocklin, as the highway bisects the two communities. Currently, bicyclists and pedestrians must travel through the five-lane undercrossing with limited infrastructure that currently exists at the interchange. Safety concerns paired with the lack of walking and bicycling facilities ultimately discourages alternate modes of travel through the undercrossing, cutting off the Sierra College area from key services and amenities on the west side of the highway.
The City is proposing to reconfigure the interchange into a Diverging Diamond Interchange (DDI) and create a dedicated bicycle and pedestrian crossing of Interstate 80 to encourage better, safer connections between Sierra College and Rocklin’s downtown. This proposed reconfiguration will also better connect residential communities along Rocklin Road and provide better access to local businesses, schools, green spaces, and other destinations.
COMMUNITY BENEFITS
The proposed Diverging Diamond Interchange and separated bike and pedestrian crossing will provide many community benefits including:
- Direct walking and biking connections between Sierra College and Rocklin’s downtown commercial core
- Safety improvements for those who walk or bike through the area
- Better facilitation of multimodal transportation including transit, walking, and biking
- Enhanced regional connectivity between the communities on either side of Interstate 80 in Rocklin
- Improved movement of people and goods through the area to support economic opportunity in the growing Placer region
- Relief of vehicular traffic on Rocklin Road to lower greenhouse gas emissions in the area
DESIGN ALTERNATIVES
The project team has narrowed down the proposed reconfiguration to two alternatives. While both designs include the Diverging Diamond Interchange (DDI), the two alternatives include different options for bicycle and pedestrian access.
Alternative 1: Pedestrian and Bicycle Overcrossing
A Diverging Diamond Interchange configuration with pedestrian and bicycle use provided by a dedicated overcrossing north of Rocklin Road.
Alternative 2: Pedestrian and Bicycle Undercrossing
A Diverging Diamond Interchange (same as Alternative 1) with pedestrian and bicycle use provided by a dedicated undercrossing north of Rocklin Road.
PROJECT FUNDING
The Rocklin Road Corridor Multimodal Enhancements Project is funded by traffic impact fees collected by the City of Rocklin and South Placer Regional Transportation Authority (SPRTA). The total cost of Alternative 1 is $44 million and Alternative 2 is $47 million. While environmental clearances and design costs are funded, the City of Rocklin is seeking state and federal funding for construction.
ESTIMATED TIMELINE
The Rocklin Road Corridor Multimodal Enhancements Project is estimated to begin construction in 2026, with the following timeline:
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