Beginning Saturday night, auxiliary lanes on the westbound Riverside (91) Freeway in downtown Corona will be closed, and lane reductions will occur on a connector ramp from Interstate 15 to the 91, as part of an ongoing improvement project, officials said Tuesday.

According to the Riverside County Transportation Commission, the lane closures will start around 10 p.m. Saturday and remain in effect until Monday, Nov. 21.

The work is part of the $12.6 million “91 Refresh Project,” which entails resurfacing lanes, modifying retaining walls and repairing concrete barriers on both sides of the freeway.

The RCTC said the two westbound lanes dedicated to the Main Street off-ramp will be closed, as well as the ramp itself. Motorists can alternatively use the Lincoln Avenue entrance and exit ramps. However, the auxiliary lane running between Main and Lincoln will not be available.

General purpose and Express Lanes on the westbound side of the freeway will not be impacted.

On northbound I-15, the connector bridge to the westbound 91 will be reduced from two lanes to one.

“To implement the temporary lane reduction configuration, there will be a full nighttime closure of the northbound and southbound I-15 to westbound 91 connectors on Saturday, beginning at 10 p.m., to Sunday at 8 a.m.,” the agency stated.

After that, the ramps will be available, but with only one lane in use on the northbound I-15 to westbound 91 connector.

“This extended closure period will help reduce the number of remaining weekend full closures required for the `91 Refresh Project,”’ RCTC said. “Construction activity is subject to change and may be rescheduled due to weather or other factors.”

The eastbound 91 has been completely shut down on three separate weekends in the last two months as part of the project, which is expected to wrap up next month. It wasn’t immediately known whether additional complete freeway shutdowns might be required between now and then.

Motorists can get up-to-date information on the closure at

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