If the watershed is 180 acres, the pond should be a minimum of 10-12 acres, or that's too much watershed.
I have seen ponds with too much watershed like that, and they get deltas in the upper end in only a couple of years, and have washouts, and lose lots of fish.
If it's a smaller pond, please consider diverting some watershed, or at a minimum, consider building a fairly large detention pond or sediment pond upstream.
