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Mercer County Park Northwest
Cold Soil Rd & Keefe Rd, Lawrenceville, NJ 08648

Spanning more than 1,600 acres in Lawrence and Hopewell townships, this park includes the old Rosedale Park andMore several other tracts of land acquired as open space by the county government.

One of those tracts, covering 812 acres, was previously owned by the AT&T and was the site of the world's largest radio telephone station. This area of the park is still sometimes called the Pole Farm, a reference to the rows of radio transmission towers that once stood there. The station was dismantled in the 1970s and the land leased to local farmers before it was purchased by the county in 1995.

The park has parking locations off Keefe Road in Lawrence and Federal City Road in Hopewell and features numerous walking, biking and horse trails, a cross-county skiing trail, a large pond for fishing, picnic areas and playground areas. 

More than 230 plant species and 100 bird species have been found in the park.