North Etiwanda Preserve will remain closed through Saturday morning.
The preserve, which is made up of multiple rare and endangered species, has been closed since Aug. 31 because of the heat wave and high fire danger, according to San Bernardino County officials.
The closure, ordered by the Rancho Cucamonga Fire Protection District and the San Bernardino County Fire Dept., is now in effect until at least 6:30 a.m. Sept. 10. Violators could be fined up to $1,000.
“A fire in the foothills could result in devastating destruction,” the fire district said in a statement. “The closure is necessary for public safety, and to prevent igniting a wildfire that can damage or destroy the region’s natural resources and the historically significant areas within the North Etiwanda Preserve.”
San Bernardino County Special Districts, the agency that manages the North Etiwanda Preserve, supports the extension, according to the statement.