The river's not deep enough for her to float, she's embedded in several feet of mud, and the insides are flooded. I'm going to assume that the technology to lift her either doesn't exist, can't reach her location, or would be implausibly expensive. As such it seems like there are three options:
1: Build a cofferdam and then a permanent dry mount for her in place.
2: Scrap her.
3: Let her rust away.
1 is obviously the ideal choice, but is also the most expensive. 2 would suck, but let's be honest, still loads better than 3. On the upside, 3 seems unlikely. The article mentioned that the owners of the adjacent land are planning to build housing there, and I doubt they'd stand for leaving 2.5 kilotons of solid tetanus in their shiny new backyard.