possibly a cradle?
see if you can rig up a temporary cradle to support it, will work if it's a temporary water drop, but if it's long term I'd see about getting some people together to dig a channel to get it somewhere it can be hauled out If it's temporary, build the cradle in sides, a trapezoid shape with large pads at top and bottom, tall enough so the can be wedged tightly against the hull and still be at an angle, wedge them in on both sides, then nail or screw ends to them to hold them in position. get some sturdy boards (2x12) to lay down as a footing for the cradle, and try to support the keel too. jackstands would work good too if you are able to ensure a secure base for them, but it wouldn't be as easy to keep them all on the same footing. A more radical option is to gently ease it over, you didn't say what type of boat it was, so can't say if that would be a viable option for it, with my boat, I wouldn't be happy about it, but wouldn't be overly concerned as that was a design criteria as I understand it. clean out the bottom on that side to get rid of any rough or hard stuff, and see if you have something you could place on that side,(bunch of innertubes, bags of styrofoam?) if the dock is sturdy enough, leaning it against that may be a feasable option too. Out here there is an area that has a whole slew of houses, (<50) each house has a dock sitting 3 to 5 ft in the air out back of it, in a few of the 'yards' there are boats sitting there totally dry. Looks very strange, docks, boats, and a few beaches, but they mow the water. The nearest navigable water is about 4 miles away, I'd say long term as there is a road and developement going through that area now. Ken.