Fire crews across Arizona are actively working on 28 separate wildfires statewide -- the most in the United States, according to the Associated Press.

Many of them were caused by lightning -- or possibly people -- and are spreading on dead wood, trees, pine needles and brush fueled by gusty winds.

According to the Department of and Fire Management, since Jan. 1 of this year, 858 wildfires have burned more than 130,00 acres across Arizona.

Here's a list of some of the biggest currently burning (as of June 13, 2017) in the state in order of size.

1. Snake Ridge Fire

The Snake Ridge Fire was caused by lightning and started burning on May 19. It is 15,333 acres in size, nine miles northwest of Clints Well and 10 miles southwest of Happy Jack, Arizona. Fire crews say 100 percent of the perimeter is contained, but shifting winds are pushing smoke toward communities.

2. Lizard Fire

This wildfire, just 2 miles southeast of Dragoon, Arizona, began on June 7 and was caused by lightning. Fire crews have contained about 40 percent of the perimeter. It is 15,131 acres in size. The surrounding community held a meeting on Sunday to ask questions and voice concerns to local and state management teams. The fire caused previous power outages, but no other outages are expected.

3. Pinal Fire

The Pinal Fire is burning 6 miles south of Globe, Arizona. It started on May 8 when lightning struck. Fire crews have contained 95 percent of the perimeter. The fire is 7,193 acres in size. Road work and camp sites remain open, but fire crews are continuing to monitor the fire.

4. Boundary Fire

The 5,390-acre Boundary Fire is burning on both the Coconino and Kaibab National Forests. The fire began June 1 and was caused by lightning. The National Weather Service issued a Red Flag Warning Saturday and Sunday and the fire grew due to the increased winds. A section of Highway 180 is closed between milepost 236 and 248 because of smoke. A meeting regarding the fire was held for surrounding residents in Tuba City Monday.

5. Slim Fire

The Slim Fire began as a 30-acre natural fire on June 1, but has since grown to be 3,241 acres in size. The fire is located 4 miles north of Forest Lakes, 16 miles west of Heber, AZ. The fire is in steep terrain and there is a temporary flight restriction in effect over the area.

6. Bowie Fire

The Bowie Fire started on June 7, and it was caused by lightning. It is 13 miles southeast of Bowie, Arizona. The fire is about 95 percent contained and is 3,036 acres in size. Fire crews said the fire is mostly slope driven, but they will monitor as windy conditions are expected.

7. Freeze 2 Fire

The Freeze 2 Fire is burning on brush on the San Carlos Apache Reservation near Freezeout Mountain. The fire began on June 1 and was caused by lightning. The area has little fire history, except for the Freeze Fire of 2016. The fire measures 2,829 acres and 35 percent of the perimeter is contained.

8. Bear Fire

Just a half mile from the edge of the Mogollon Rim in Bear Canyon, the Bear Fire started June 1. Fire crews report it was caused by lightning. On June 10, the Highline Fire started at the base of the Mogollon Rim below the Bear Fire and crews assisted on containing the Highline Fire. The Bear Fire is 2,171 acres in size.

9. Rucker Fire

The 1,100-acre Rucker Fire began June 7 and was started by lightning. The fire is in the Douglas Ranger District in the Coronado National Forest. It is burning on brush and is 61 percent contained. Fire crews are working to secure the fire perimeter and cool hot areas along the fire line.

10. Paige Creek

The Paige Fire is on the east side of the Rincon Mountain range near Tucson and is 1,064 acres in size. The fire is burning on grass and the perimeter is 90 percent contained with no recent growth. It began June 7 and was caused by lightning.

11. Highline Fire

The Highline Fire started on June 10, eight miles north of Payson. It is currently 500 acres in size and fire crews have not been able to contain the perimeter, but crews are working on it. The cause of the fire is under investigation. Fire crews said protecting nearby watersheds, local communities, pipelines, power lines and sensitive species are a priority.

12. Tee Fire

The cause of the Tee Fire is unknown, but it started burning June 10, four miles southeast of Black Canyon City. The fire is 50 percent contained and measures 659 acres in size. This fire is burning in hard-to-reach terrain so air resources are playing an important role. Fire crews are working to insure stability of the fire lines because gusty winds and hot weather are expected.

13. Frye Fire

The Frye Fire was started by lightning on June 7 on the north side of the Mount Graham in Safford, Arizona. The fire is 320 acres in size.

14. Antelope Fire

The cause of the 152-acre fire is under investigation. It's 80 percent contained and is located just 3 miles east of Dolan Springs in Mohave County, Arizona.