With beginnings in Glacier Bay National Park and an end in Icy Strait, the Good River is like many Southeast Alaska rivers — a nursery for fish, cold, and relatively short (for Alaska standards). For the mountains along Alaska’s Panhandle generally rise abruptly from deep fjords and have felt the presence and pressure of glaciers for at least 7 million years. Rivers here tend to tumble quickly from mountains to sea. But that’s where the Good River departs from the usual story — it’s groundwater fed and makes a lazy traverse across a relatively recent outwash plane.