Is the river tidal? If so, use the flow to your advantage!
Yeah, Denise! I'm actually on the Delaware, too. The bridge in question is the DelAir railroad bridge, just south of the Betsy Ross.
As for the flow: The tide slacked off a *lot* in the couple hours that we took to go down river, but my problem is, the wind did too. Once the sun went down, there was NO wind, and I was screwed. I really didn't have time to wait for the tide to head back up.