[ghaff]

It's not especially near 110th Street :-) It crosses from 173rd Street in Manhattan to 170th Street in the Bronx. Washington Heights has seen a fair bit of urban renewal and there's also been work on the river paths etc. on the Bronx side. The short answer is that neither side of the river is especially rich and there probably wasn't much impetus from anyone to reopen the bridge and do corresponding park and path revitalization while they were in the midst of fairly serious urban decay which they were for a long time.

[negativity]

Ha! Yeah, that'd be like an hour's walk from 110th St. And subway connections readily cross-pollinate both sides of the bridge, in terms of actual human movement. Especially, given that Yankee Stadium is nearby. Not to mention that buses also offer a connection, but maybe someone would try to suggest that a bus isn't an option for some people.

Anyway, the George Washington bridge is actually much, much closer to High Bridge Park than 110th St. The next closest walkable bridge between The Bronx and Manhattan, open to pedestrians, is probably at 145th St. on the Manhattan side. It's not connected to a park, though.

[lifeisstillgood]

Well, one movie, one song and ... Oh yeah that's Harlem. Oops