I agree with Murph, 'White Cedar' (Cedrus) makes a nice looking screen. Also worth considering is Fastigiate Atlas Cedar (C. atlantica 'Glauca Fastigiata'), it grows about 10 to 12 inches per year and its columnar shape rarely exceeds 10 feet in diameter. I prefer Eastern or Canadian Hemlock (Tsuga canadensis), however, with the invasion of the Asian Wooly Adelgid, hemlocks may be going by way of the great American elm. Hemlocks need spraying for control twice a year, not an easy thing. Anyway, try stagger planting regardless of your choice (two lines of plantings, the back row being aligned with the open spaces of the front line), this form of planting provides maximum screen density and doesn't interfer with growth.

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