PORTLAND, Ore. -- People in one southwest Portland neighborhood are still waiting to hear what caused a four-story house to collapse and slide down a hill Wednesday morning.

Experts are working quickly to make sure there isn't any more damage.

Even though there isn't any official word on what caused the house to slide down the hill, experts said that water definitely played a role.

Workers from the Portland Water Bureau made sure Friday that more water didn't add to the problem.

The hillside is now a huge mess of mud water and debris. Experts aren't sure how stable it is. A large water main runs along the top of the hill and workers feared that it could break if there is another slide, which would make the problem much worse.

Workers shut off that pipe Friday so they could install new valves on either side, which gives them the ability to shut just that section off in the event of another slide.

"What we're doing today is kind of a pre-emptive strike if you want to call it that. We want to make sure that this main doesn't suddenly break. We don't really know where the landslide is underneath the road. It could just settle and break, and then we'd be dumping thousands of gallons of water a minute," said Michael Stuhr of the Portland Water Bureau.

Investigators still had no word on what caused the slide and said that they aren't sure when they'll be able to say what the cause was.

Parts of Southwest Burlingame Place and Terwilliger Boulevard were still closed Friday.

Workers Try To Stabilize Hill After Slide

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Related: House Slides Down Hill In SW Portland