Thanks for all your wonderful responses!

This evening my wife saw a SECOND baby in the same tree!

To find the owls... Park in the lot by the lodge off of 24th St and
follow the path to the right of the lodge. There will be a large
meadow on your left. Continue on this path around the back of the
maintenance shed and it enters the park on a main "spine" trail. Take
this trail for about 100 yards and you will come to a fork to the left
that goes off to a wooden bridge. About 20ft to your left at this
point is large cedar tree. The babies are up in the top of this cedar,
where if forms a U-shaped bowl. The parents are usually within the
grove to the right of the wooden bridge, or just to the left. It is
pretty easy to find them.

http://www.google.com/maps?q=beaver+lake+park+washington&hl=en&ll=47.587264,-122.005014&spn=0.001561,0.002411&sll=37.0625,-95.677068&sspn=59.119059,79.013672&t=h&hq=beaver+lake+park+washington&z=19

If there is enough interest, I am happy to lead a tour this weekend to
see them. We could meet at 6PM on Sunday evening outside the lodge,
and take a walk into the park to see them!

Frank