advice on root systems of windbreak trees/evergreens

I'm looking for a species of evergreen for a windbreak and/or view blocker but it is in a tricky spot. About 20 feet away, 4-5 feet underground is a water line. Directly on the other side is a gravel driveway. I haven't been able to find any reliable information on root systems of windbreak evergreens. Most wind break trees have very extensive roots, so I'm willing to go with a tree that isn't exactly a wind break tree, just a view blocker. Also they only have to be about 20 feet tall, so I'm wondering if I space some spruce closer together would they possibly have less extensive roots in the direction 90 degrees to the tree line? Probably not....Zone 4 Wisconsin. Thank you!
-Courtney

I feel that any tree that needs to be 20 ft tall will need a good root system to keep the tree from blowing over in the wind.

Since you have done your homework it looks like Spruce would be a good option.

If you just want something to block the view, why not go with vines?

Of course, with vines, you would need something 20 ft tall for the vines to climb on.