Firefighters have responded to an estimated 100 lightning-caused fires across the Rogue River-Siskiyou National Forest in southwest Oregon since Sunday. As a result, the U.S. Forest Service is bringing in additional resources, according to a Monday afternoon news release. Fires are also burning in other parts of the state.

The Hendrix fire, which had burned an estimated 170 acres southwest of Ashland as of 3 p.m. Monday, was started by lightning Sunday, according to information from U.S. Forest Service's Facebook page.

Nearby, fires in the Wagner Complex also caused by lightning are burning more than 200 acres.

#UPDATE 1:00 p.m. #WagnerCreekComplex (series of fires throughout Jackson County) #GarnerComplex (series of fires throughout Josephine County) Please note that this is a rapidly changing incident in which we are all working diligently to bring you information as we have it. We are asking for your patience as we work to tackle all of the fires within both complexes. All of the fires within the two complexes are on ODF-protected land. In a hope to debunk some rumors, please note that complexes are named after the location in which we first detect a lightning start on the district, not after the “largest fire concern” area. #FireSeason2018 Posted by ODF Southwest Oregon District on Monday, July 16, 2018

The Gravel fire, burning 100 acres just 8 miles northwest of Prospect, Oregon, was caused by lightning Sunday, according to Northwest Interagency Coordination Center. The fire was 0 percent contained Monday.

Sunday lightning also started eight new fires in Crater Lake National Park, all a half acre or less in size. The park remains open and visitors are not at risk, according to a Monday evening news release from the park.

Also in southwest Oregon, the Canyon Creek fire is burning about four miles south of Canyonville and is estimated to be around eight acres, according to a news release from Douglas Forest Protective Association. Other small fires are also burning in the southwest region.

The Collawash fire is a 25-acre wildfire discovered Sunday on the Clackamas River Ranger District of the Mt. Hood National Forest. Crews are making progress in building a line around the fire, according to a news release. Fire danger is high across Mt. Hood National Forest, with high temperatures and low humidity providing fires the possibility to grow fast. No closures are in place but visitors should be cautious when driving in the area.

East of Salem, a fire is burning around 27 acres in the southeast corner of Silver Falls State Park. The Silver Creek fire is estimated to be 35 percent contained, according to a Monday afternoon news release. Steep slopes, thick undergrowth and large snags pose challenges for firefighters in the area. No injuries or facility damage have been reported. Smoke was reported Thursday evening and a fire attack was launched Friday, according to the release.

In eastern Oregon, the Currey Canyon fire in Malheur County is 50 percent contained with one residence threatened as of Monday morning. It's burned 3,100 acres so far. Firefighters expect to have it fully contained by Friday.

In Wheeler County, firefighters have contained the Solitude fire, which started July 8 and burned 708 acres near Spray, Oregon.

More information about fires can be found here and here.

--Hannah Boufford

hboufford@oregonian.com / @hannahboufford