As of 8:59 p.m. the fire that started near the intersection of Castro Valley Road and U.S. Highway 101 was 50 percent contained.

As of 8:59 p.m. the fire that started near the intersection of Castro Valley Road and U.S. Highway 101 was 50 percent contained.

Flames from a backfire burn above fire trucks as CalFire crews battle the wildfires near Mariposa, Calif., on Tuesday, July 18, 2017.

Flames from a backfire burn above fire trucks as CalFire crews battle the wildfires near Mariposa, Calif., on Tuesday, July 18, 2017.

Melted lawn chairs rest outside a residence leveled by the Detwiler fire near Mariposa, Calif., on Wednesday, July 19, 2017.

Melted lawn chairs rest outside a residence leveled by the Detwiler fire near Mariposa, Calif., on Wednesday, July 19, 2017.

Flames rise behind a vacant house as firefighters work to halt the Detwiler fire near Mariposa, Calif., Wednesday, July 19, 2017.

Flames rise behind a vacant house as firefighters work to halt the Detwiler fire near Mariposa, Calif., Wednesday, July 19, 2017.

Firefighters with Cal Fire continue to battle the Detwiler Fire on the outskirts of Mariposa, Ca., on Wednesday July 19, 2017.

Firefighters with Cal Fire continue to battle the Detwiler Fire on the outskirts of Mariposa, Ca., on Wednesday July 19, 2017.

A helicopter makes a water drop as firefighters continue to battle the Detwiler Fire on the outskirts of Mariposa, Ca., on Wednesday July 19, 2017.

A helicopter makes a water drop as firefighters continue to battle the Detwiler Fire on the outskirts of Mariposa, Ca., on Wednesday July 19, 2017.

Burned out structures and vehicles along highway 140 west of in Mariposa, Ca., on Wednesday July 19, 2017.

Burned out structures and vehicles along highway 140 west of in Mariposa, Ca., on Wednesday July 19, 2017.

Cal Fire strike team leader Zack O'Neill works a fire line as firefighters continue to battle the Detwiler Fire on the outskirts of Mariposa, Ca., on Wednesday July 19, 2017.

Cal Fire strike team leader Zack O'Neill works a fire line as firefighters continue to battle the Detwiler Fire on the outskirts of Mariposa, Ca., on Wednesday July 19, 2017.

Jeffrey Hernandez with Cal Fire as firefighters continue to battle the Detwiler Fire on the outskirts of Mariposa, Ca., on Wednesday July 19, 2017.

Jeffrey Hernandez with Cal Fire as firefighters continue to battle the Detwiler Fire on the outskirts of Mariposa, Ca., on Wednesday July 19, 2017.

Click through this slideshow to see the most striking photos from the 2017 California wildfire season.

Flames from a wildfire surround a lawn statue near Oroville, Calif., on Sunday, July 9, 2017.

Click through this slideshow to see the most striking photos from the 2017 California wildfire season.

Flames from a wildfire surround a lawn statue near Oroville, Calif., on Sunday, July 9, 2017.

Flames from a wildfire consume a care near Oroville, Calif., on Saturday, June 8, 2017.

Flames from a wildfire consume a care near Oroville, Calif., on Saturday, June 8, 2017.

A fire burns near Campolindo High School off of Moraga Road in Moraga, California, on Monday, June 19, 2017.

A fire burns near Campolindo High School off of Moraga Road in Moraga, California, on Monday, June 19, 2017.

In this long exposure photograph, embers fly off smouldering trees after flames from the 'Wall fire' tore through a residential neighborhood near Oroville, California on July 9, 2017.

In this long exposure photograph, embers fly off smouldering trees after flames from the 'Wall fire' tore through a residential neighborhood near Oroville, California on July 9, 2017.

A firefighter battles a wildfire as it threatens to jump a street near Oroville, Calif., on Saturday, July 8, 2017. Evening winds drove the fire through several neighborhoods leveling homes in its path.

A firefighter battles a wildfire as it threatens to jump a street near Oroville, Calif., on Saturday, July 8, 2017. Evening winds drove the fire through several neighborhoods leveling homes in its path.

Firefighters save a US flag as impending flames from the Wall fire close in on a luxury home in Oroville, California on July 8, 2017.

Firefighters save a US flag as impending flames from the Wall fire close in on a luxury home in Oroville, California on July 8, 2017.

An animal stands on a property as impending flames close in on a residential area in Oroville, California on July 8, 2017.

An animal stands on a property as impending flames close in on a residential area in Oroville, California on July 8, 2017.

This photo provided by Eliot Oppenheimer, taken late in the evening Sunday, July 9, 2017, shows the Whittier fire burning in the mountains west of Santa Barbara, Calif.

This photo provided by Eliot Oppenheimer, taken late in the evening Sunday, July 9, 2017, shows the Whittier fire burning in the mountains west of Santa Barbara, Calif.

A plane drops retardant while battling a wildfire near Oroville, Calif., on Saturday, July 8, 2017. T

A plane drops retardant while battling a wildfire near Oroville, Calif., on Saturday, July 8, 2017. T

Flames from a wildfire consume a shed near Oroville, Calif., on Sunday, July 9, 2017. Evening winds drove the fire through several neighborhoods leveling homes in its path.

Flames from a wildfire consume a shed near Oroville, Calif., on Sunday, July 9, 2017. Evening winds drove the fire through several neighborhoods leveling homes in its path.

A helicopter works to contain a fire near Campolindo High School off of Moraga Road in Moraga, California, on Monday, June 19, 2017.

A helicopter works to contain a fire near Campolindo High School off of Moraga Road in Moraga, California, on Monday, June 19, 2017.

This Saturday, July 8, 2017, photo provided by the Santa Barbara County Fire Department shows a large fire whirl developing from erratic winds near Tepesquet Road in a wildfire east of Santa Maria, Calif., in Santa Barbara County, Calif.

This Saturday, July 8, 2017, photo provided by the Santa Barbara County Fire Department shows a large fire whirl developing from erratic winds near Tepesquet Road in a wildfire east of Santa Maria, Calif., in

Flames from a wildfire consume a residence near Oroville, Calif., on Sunday, July 9, 2017.

Flames from a wildfire consume a residence near Oroville, Calif., on Sunday, July 9, 2017.

This photo provided by the Santa Barbara County Fire Department shows Rancho Alegre Outdoor School, a camp which suffered extensive damage from the Whittier fire near Santa Barbara, Calif., Monday, July 7, 2017.

This photo provided by the Santa Barbara County Fire Department shows Rancho Alegre Outdoor School, a camp which suffered extensive damage from the Whittier fire near Santa Barbara, Calif., Monday, July 7,

Flames surround a marijuana plant as a wildfire burns near Oroville, Calif., on Saturday, July 8, 2017. Residents were ordered to evacuate from several roads in the rural area as flames climbed tall trees.

Flames surround a marijuana plant as a wildfire burns near Oroville, Calif., on Saturday, July 8, 2017. Residents were ordered to evacuate from several roads in the rural area as flames climbed tall trees.

Firefighters battle a wildfire as it threatens to jump a street near Oroville, Calif., on Saturday, July 8, 2017.

Firefighters battle a wildfire as it threatens to jump a street near Oroville, Calif., on Saturday, July 8, 2017.

Sean Greenlaw views his truck covered in fire retardant as a smoke plume billows in the background near Oroville, California on July 08, 2017.

Sean Greenlaw views his truck covered in fire retardant as a smoke plume billows in the background near Oroville, California on July 08, 2017.

This photo provided by the Santa Barbara County Fire Department shows the remains of a structure burned near Camp Whittier near Santa Barbara, Calif., Monday, July 7, 2017.

This photo provided by the Santa Barbara County Fire Department shows the remains of a structure burned near Camp Whittier near Santa Barbara, Calif., Monday, July 7, 2017.

Firefighter Kern Kunst battles the Wall fire near Oroville, Calif., on Saturday, July 8, 2017. According to CalFire, the blaze has scorched 1,000 acres and destroyed 10 homes.

Firefighter Kern Kunst battles the Wall fire near Oroville, Calif., on Saturday, July 8, 2017. According to CalFire, the blaze has scorched 1,000 acres and destroyed 10 homes.

A Skycrane makes a water drop on hot spots near Hot Spring Canyon and Highway 154 in the Whittier fire area near Santa Barbara, Calif., Wednesday, July 12, 2017.

A Skycrane makes a water drop on hot spots near Hot Spring Canyon and Highway 154 in the Whittier fire area near Santa Barbara, Calif., Wednesday, July 12, 2017.

A firefighter sprays water as flames from a wildfire consume a residence near Oroville, Calif., on Sunday, July 9, 2017. Evening winds drove the fire through several neighborhoods leveling homes in its path.

A firefighter sprays water as flames from a wildfire consume a residence near Oroville, Calif., on Sunday, July 9, 2017. Evening winds drove the fire through several neighborhoods leveling homes in its path.

CalFire firefighter Jake Hainey, left, and engineer Anna Mathiasen watch as a wildfire burns near Oroville, Calif., on Saturday, July 8, 2017.

CalFire firefighter Jake Hainey, left, and engineer Anna Mathiasen watch as a wildfire burns near Oroville, Calif., on Saturday, July 8, 2017.

Flames from a wildfire engulf trees near Oroville, Calif., on Saturday, July 8, 2017.

Flames from a wildfire engulf trees near Oroville, Calif., on Saturday, July 8, 2017.

A plume of smoke rises as impending flames from the 'Wall fire' approach Forbestown Road near Oroville, California on July 8, 2017.

A plume of smoke rises as impending flames from the 'Wall fire' approach Forbestown Road near Oroville, California on July 8, 2017.

Flames from a wildfire consume an all-terrain vehicle near Oroville, Calif., on Saturday, July 8, 2017. Residents were ordered to evacuate from several roads in the rural area as flames climbed tall trees.

Flames from a wildfire consume an all-terrain vehicle near Oroville, Calif., on Saturday, July 8, 2017. Residents were ordered to evacuate from several roads in the rural area as flames climbed tall trees.

Inmate firefighters battle the Wall fire near Oroville, Calif., on Saturday, July 8, 2017. According to CalFire, the blaze has scorched 1,000 acres and destroyed 10 homes.

Inmate firefighters battle the Wall fire near Oroville, Calif., on Saturday, July 8, 2017. According to CalFire, the blaze has scorched 1,000 acres and destroyed 10 homes.

Firefighter Kern Kunst battles the Wall fire near Oroville, Calif., on Saturday, July 8, 2017. According to CalFire, the blaze has scorched 1,000 acres and destroyed 10 homes.

Firefighter Kern Kunst battles the Wall fire near Oroville, Calif., on Saturday, July 8, 2017. According to CalFire, the blaze has scorched 1,000 acres and destroyed 10 homes.

Flames from the Wall fire descend a hillside near Oroville, Calif., on Saturday, July 8, 2017. According to CalFire, the blaze has burned 1,000 acres and destroyed 10 homes.

Flames from the Wall fire descend a hillside near Oroville, Calif., on Saturday, July 8, 2017. According to CalFire, the blaze has burned 1,000 acres and destroyed 10 homes.

A fire burns near Campolindo High School off of Moraga Road in Moraga, California, on Monday, June 19, 2017.

A fire burns near Campolindo High School off of Moraga Road in Moraga, California, on Monday, June 19, 2017.

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Update: Forward Progress Of Brush Fire Near Gilroy Stopped - SFGate