Tree rope winch and some large sturdy braces for leaning trees?

[tree_luv]

In PNW area there is an artificial wetland (less than 1ft of water about 6 months per year) that was created a few decades ago as a 2-3 acre storm water catch basin and headwater of intermittent creek. There are large tall maples, cherry, and willows in/near the storm water collection that don't seem to like it much and I think they were here before the artificial catch basin was created. The result is large mature tall trees leaning and/or falling over everywhere, perhaps poisoned by the storm water runoff or biannual saturated soil or both? Was hoping a tree rope winch and some large sturdy braces could save these very-much-still-alive-trees from early graves by bracing them in 65-75° angles. Any honest input or other ideas are appreciated.

 

[Woodtroll]

I think the cherries and maples are not being poisoned, but are literally drowning from the standing water blocking oxygen from the roots. As you say, they must have been there prior to the impoundment, as I don't think they would have gotten that big standing in water. I doubt there's much hope for them.

The willows, depending on species, may fare much better.