Christiana Creek drainage (St. Joseph River watershed)
Ices most winters with a strong local ice community — panfish and pike through the hard water. The island's wind shadows create uneven ice; the channels between island and shore demand respect.
Can you visit Diamond Island?
Diamond Lake is Cass County's flagship: a thousand-plus acres of clear, hard-bottomed water at Cassopolis with a genuine rarity in its middle — Diamond Island, one of the largest islands on any Michigan inland lake, ringed by its own cottage colony reachable only by boat. The lake's resort history runs back to the rail era, when Chicago money summered here; the water-ski clubs, sailing fleet, and busy summer weekends carry that DNA forward.
It fishes better than its social calendar suggests: smallmouth on the rock and sand structure, largemouth in the shallower bays, pike on the edges, and strong panfish — with the public access putting working anglers on water the cottages otherwise dominate. Early mornings and the shoulder seasons belong to the fishermen; summer midday belongs to the wakes.