Project Overview

The County of Riverside Transportation Department (County), in cooperation with the California Department of Transportation (Caltrans), is proposing to widen Temescal Canyon Road from two lanes to four lanes from north of El Cerrito Road to Tom Barnes Street, along with a 200-foot segment north of Cajalco Road, in the unincorporated community of El Cerrito in Riverside County and the city of Corona, California. A two-way left-turn lane and sidewalks would be included. The purpose of the Project is to alleviate congestion resulting from increased regional traffic as well as overflow traffic from I 15 during peak hours and provide a complete street to serve pedestrians, bicyclists, motorists, and transit riders of all abilities.

In summary, the purpose of the project is to:

1. Decrease traffic congestion within the Temescal Valley Region.

2. Provide a safety passage for residence and those commuting to and from the El Cerrito Area.

3. Utility relocations and adjustments.

4. Installation of roadway striping, pavement markings, and signage

The draft Initial Study / Mitigated Negative Declaration (IS/MND) document is available to view by clicking on the link under Project Documents.

Public Circulation Period
January 24, 2025 - February 22, 2025

The Draft Initial Study with Proposed Mitigated Negative Declaration (MND) for the Temescal Canyon Road Widening Project—El Cerrito Segment document will be available for review at the following locations:

County of Riverside Transportation Department, 3525 14th Street, Riverside, California 92501 (Monday–Friday, 7:00 a.m. to 5:00 p.m.
County of Riverside Public Library, El Cerrito Branch Library, 7581 Rudell Road, Corona, California 92881 (During normal library hours)
Corona Public Library, 650 S Main Street, Corona, California 92882 (During normal library hours)
Project website: https://rcprojects.org/temescalelcerrito

Public Meeting
Date: February 13th, 2025
Time: 5:30pm - 7pm
Where: Corona Public Library, 650 S Main Street, Corona, California 92882
Room: Frances Aldama Martinez Community Room

Additional Project Details

ADDITIONAL WIDENING PROJECTS TO REDUCE TRAFFIC CONGESTION IN TEMESCAL VALLEY

A separate County of Riverside street widening project is in design for 0.6 mile along Ontario Avenue from north of El Cerrito Road to State Street. The Ontario Avenue project will add an additional northwest-bound lane to Ontario Avenue, which currently has one northwest-bound lane and two southeast-bound lanes.

In addition, the City of Corona is in the process of designing the widening of 0.3 mile of Ontario Avenue between State Street and the Interstate 15 interchange.

The completion of the Temescal Canyon Road and Ontario Avenue widening projects will result in a continuous 4-lane street for the 5.7 miles between the Interstate 15 interchanges at Ontario Avenue and at Temescal Canyon Road near Tom’s Farm.

Other efforts to reduce congestion in Temescal Valley include the Riverside County Transportation Commission (RCTC) project to add express lanes to Interstate 15 for 14.5 miles between Cajalco Road and Highway 74 (Central Avenue) in Lake Elsinore.

All widening projects are expected to be completed by 2028.