By Wednesday morning, the blaze was at 20 percent containment. It first ignited Monday afternoon near the eastbound 91 Freeway at Coal Canyon Road.
Fire activity has slowed thanks to aggressive ground and air activity and more favorable weather conditions, officials said.
PHOTOS: Canyon Fire near Corona/Anaheim
Firefighters are continuing to work around the clock to protect homes from the blaze.
There were no reports of injuries in the fire, which damaged three structures, according to the Orange County Fire Authority.
All roads north of Green River Road and W. Foothill Parkway have reopened to residents with valid identification. Fire officials said access to these areas must be made using Serfas Club Drive and Paseo Grande.
VIDEO: Surveillance video shows Canyon Fire dangerously close to Corona home
About 1,500 residents were evacuated before the orders were lifted.
- All roads south of Green River Road. From 91 Freeway to West Foothill Parkway, including the skyline Drive Area.
- Eastbound 91 Freeway (No. 5 lane) from Coal Canyon Road to Green River Road including the Green River off-ramp.
- Northbound Black Star Canyon at Silverado Canyon Drive and southbound Coal Canyon Road at Gypsum Canyon Road.
A total of 1,589 fire personnel are battling the blaze, authorities said.
The thick smoke from the fire has prompted health officials to issue smoke advisories for four Southern California counties.
The following schools are closed on Wednesday, in part because of the air quality issues.
- Coronita Elementary School
- John Adams Elementary School
- Cesar Chavez Academy
- Prado View Elementary School
- Eisenhower Elementary School
- Citrus Hills Intermediate School
- Franklin Elementary School