Bridger Wilderness Area Information Pinedale Ranger District Outfitter & Guides Pinedale "Things to See and Do" Highlighting the Green River Lakes and Squaretop Mountain Description: The Green River Lakes are nestled behind a natural terminal-moraine dam scoured out by glacial action and surrounded by the stark, cold, steep topography of the Wind River Range. Mostly composed of granite uplifts from deep within the earth over 1 billion years ago, these granite monoliths were uplifted and carved by glaciers 500,000 years ago to form circular valley cirques. The Wind River Range is not only one of the oldest mountain ranges in North America, but has the most extensive glacial network in the lower 48 states. Elevations range from 8,000 feet at Green River Lakes to 13,804 feet at Gannett Peak, the tallest mountain in the middle Rocky Mountains. The Green River Lakes are considered the headwaters of the Green River; the chief tributary to the Colorado River.
Source: rec_gov · last verified 2026-05-14