RENO, Nev. — Firefighters neared containment Friday of a wildfire that burned about 750 acres in the Sierra Nevada foothills.

The Highway fire that broke out Monday along Interstate 80 just west of the Nevada-California line was 60 percent contained, officials said.

“We’re anticipating if everything goes as planned and the weather cooperates that we’ll have full containment by Saturday night,” said fire spokesman Dick Birger.

A doubling of manpower and a change in wind direction helped firefighters on Thursday. The shifting wind pushed the fire back into itself, and more than 600 personnel were working the lines while seven helicopters made aerial water drops.

Interstate 80 — the main route between northern Nevada and California, remained opened, but officials urged motorists to be cautious of fire equipment parked on the edge of the highway through the burn area.

Because of the three-day Memorial Day weekend and anticipated heavy holiday traffic, Birger said some fire crews would stay in the woods.

Normally, hand crews are shuttled in “crew buggies” — vehicles that carry eight to 10 people — to and from base camp, where they eat and sleep.

But over the weekend, Birger said at least some crews would hunker down at what they call “spike camps.”

“We will supply hot breakfasts, hot suppers and bagged lunches,” Birger said.

The goal, he said, is to reduce travel time and decrease their exposure to traffic on the interstate.

“Anything we can do to lessen the traffic is a safety measure,” he said.

While official fire restrictions have not yet been issued for public lands in the western Nevada, authorities urged people to be careful as they head outdoors for the long weekend.

Though camp grounds high in the mountains were still wet, lower elevations are quickly drying out.

“Even though we’re not in restrictions, people still need to be very, very careful, especially with campfires and charcoal grills,” said Franklin Pemberton, a Forest Service spokesman.

After Memorial Day, he said rangers typically find abandoned campfires that are not completely out.

“If you can still feel heat with the back of your hand, dump more water on it and stir it some more,” he said of extinguishing campfires. “It takes quite a bit to get those coals completely out.”

Fire officials also urged people not to assume a fire has been reported if they see smoke on the horizon.

“We want to be able to react quickly when these starts are still small, rather than have a time lag and a bigger fire,” Birger said.