LOS ANGELES -- Firefighters on Wednesday fully contained one of three major wildfires that have scorched more than 90,000 acres in the Santa Clarita Valley since Saturday, and made progress on containing the others.

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The Ranch Fire, the first to start, broke out Saturday northwest of Castaic near Townsend Peak. The wildfire has charred more than 51,300 acres, destroyed seven structures and 14 boats in a storage area, fire officials said.

The Ranch Fire was about 45 percent contained this morning and is expected to be contained, or fully surrounded, by Oct. 31, officials said.

Southland fire crews hoped to make significant progress on containing the remaining fires as weather conditions improve and winds slow down over the next two days.

Buckweed Fire

The Buckweed Fire, which began Sunday in the Agua Dulce area, has scorched an estimated 38,300 acres and was about 94 percent contained, according to the Los Angeles County Fire Department.

It has destroyed 15 homes, 17 outbuildings, two bridges and 40 vehicles. Four people were injured. About 15,000 people were evacuated.

Fire officials believe the Buckweed Fire may have been the result of downed power lines.

Magic Fire

The Magic Fire, the last of the three big fires, broke out Monday near The Old Road and Magic Mountain Parkway in the Stevenson Ranch area. No structures were damaged, and no one was hurt, said Deputy Ed Hernandez of the county Office of Emergency Management.

The Magic Fire, which scorched 1,750 acres, was 100 percent contained this morning, according to L.A. County Fire. The fire has been determined as accidental, caused by construction workers doing welding work in the area, Hernandez said.

Firefighters battling the blazes cleared brush and beat back flames Tuesday afternoon, preventing the Meadow Ridge Incident from crossing the 5 Freeway.

Santa Clarita Valley Fires Update

The 50-acre fire was between the Buckweed and Ranch fires.

"This fire could have cut off Interstate 5," said Steve Martin of the Los Angeles County Fire Department. "We might have gotten lucky. This was an area that we've anticipated would go up for years. Luckily, with a quick attack, we were able to stop it."

In addition to the freeway, Martin said a vital Metrolink tunnel is in the area.