Good question. Bonnie.
Several quick-fingered shutter-bugs have captured the errant sandpiper pulling round worms
from the watery gravel where it has been feeding actively, much as robins pull earthworms from the soil.
So the Purple Sandpiper DOES have a food supply (although maybe be not seafood), and it has thrived for at least a week, feeding in the warm effluent waters
of Iron Springs, where it debauches into Dillon Reservoir. Who knows, the bird could have been there for weeks? If this were fall
migration season, one could expect it to move on, responding to the urge to travel. But the bird may sense that it has reached
a good spot to spend the winter, so I would not mess with it.
It may be difficult to see harm in supplementing the bird's food supply with mealworms, but there are possible consequences one cannot foresee.
And at the very least, laying out a smorgasbord of mealworms could just happen a few hours or a day or two before it decided to leave it's happy microhabitat.
And if that happened, whoever tossed the vermiform banquet could be blamed, even if blameless.
My 4 cents (inflation)
Joe Roller, Denver