Just plan for a Thanksgiving trip this fall- if your favorite run is OBJ, it is not worth your time to travel down there in March. The season is already over, as far as anyone who prefers class III & up is concerned. Just plan on a November/early December trip. As I mentioned in your thread back in December, El Salto might
have reasonable flows in it, but I'm not sure it's worth the drive just for that. More likely that it's dry by now too.
Here's the average flow graph for Micos:
And the Santa Maria:
To most of us who've been down there & aren't trying to sell you something, I think the consensus is would be that there are better options for this time of year. Maybe not warm options, though.