From Ivan Kossack:

Sue Kaufmann and I found a Northern Shrike at Johanson Memorial Fields in Boonton Township. The address is 353 Powerville Road. As you go up the park road the bird was working a grove of small cedars to the right of the road before a small gravel parking lot (also on the right.) The cedars are just past a patch of deciduous woods about 100 yards wide. You may want to edge forward once you reach the edge of those deciduous woods as the bird appears a little skittish.

Ivan Kossack
Lincoln Park, NJ