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Grant Line Road Widening, Phase 2 (Waterman to Bradshaw)

Mosher Road will be closed to traffic between Grant Line and Sonoma Creek to install underground utilities. A detour will be in place through June 2021.

Affected Area: North and South bound traffic on Mosher Road between Sonoma Creek Drive and Grant Line Road.

Temporary Traffic Controls in Place: Road Closure May 17, 2021 through June 18, 2021

Motorists are advised to use alternative routes until project work is completed in these areas. Detour signs and electronic message boards are in place to alert motorists, pedestrians, and bicyclists of detours.

Project Overview

The Grant Line Road Widening Project (Project) will widen Grant Line Road from two to four lanes, between Waterman Road and Bradshaw Road. Traffic signals will be installed at intersections with Bradshaw Road and Mosher Road. A 10’ Wide Multi-Use Trail will also be installed through the project limits.

The widening of Grant Line Road to 4 total lanes will reduce congestion and improve safety. While this project is only planning for 4 lanes of traffic, the City foresees this road at an "Ultimate" width of 8 lanes. The implementation of the additional 4 lanes is not expected to be needed for several decades.

The Project is a part of the Capital Southeast Connector known as Segment B2. The City continues to coordinate with the Capital Southeast Connector JPA (JPA) on improvements. For more information on the Capital Southeast Connector, please visit their website:


New Roadway Cross Section

Cross Section

Select a photo to view it larger





Project Milestone Completed Major Tasks Scheduled for Completion
Environmental Revalidation Complete April 2020
CTC Approval of Construction Funding June 2020
Right of Way Complete July 2020
Design Complete August 2020
Advertise for Bids September 2020
Project Awarded for Construction November 2020

Construction Start April 2021  
Construction Finish
Spring 2022


This project has funding from a variety of sources. Local funds are from the City’s Roadway Fee Program and Developer In-Lieu fees. State funding is through the Road Repair and Accountability Act of 2017 (SB-1). Federal funding is from the State of California’s Transportation Improvement Program, which is derived from revenues from the Transportation Investment Fund.


If you have questions or concerns please contact the Grant Line Road Widening Project Information Hotline at (916) 509-3550 or

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