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I'm going with RD on this one. From reading online about the Oregon Vortex, the general consensus is that it is merely a roadside attraction capitalizing on an optical illusion. Fun, but ultimately non-significant. Gravity and magnetic hill phenomena due occur all over the world, but they are all regarded as simple optical illusions, usually relying on an obstructed horizon which is usually what we use as a reference point in determining what is up- and downhill.
It doesn't roll uphill, merely seems to. That's what makes it an optical illusion.
The net effect of gravity anywhere on the Earth's surface is towards the centre of the Earth, which is why you aren't pulled into the side of Mount Everest if you stand next to it. This is an optical illusion, caused by the fact that you can't see the horizon and your senses can be easily fooled.
The Schiehallion experimentNevil Maskelyne to use the deflection caused by the mass of the mountain to estimate the mass of the earth in a ground-breaking experiment in 1774.