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Minnesota
Mount Rose - Once an Island!
0.4 mi
Distance
696 ft
Gain
16 min
Time
No verdict for this trail
We won't guess. Here is exactly what we do and don't know.
What we do know
Inside Grand Portage National Monument
National Park unit boundary is mapped — agency alerts for it feed this page automatically.
Boundary data
What's missing
No access route mapped
We don't yet know which road reaches this trailhead, so we can't tell you if it's gated.
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Mount Rose - Once an Island!
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Elevation & route
- Distance
- 0.4 mi
- Elevation gain
- 696 ft
- Elevation loss
- 696 ft
Photos
Directions & GPX
Permits & access
- Managing agency
- National Park Service
About this trail
<h2>Mount Rose – Once an Island!</h2> <p>About 12,000 years ago, melting glaciers formed temporary lakes. The biggest, Glacial Lake Duluth, submerged most of the Grand Portage. Its shoreline was 738 feet (225 m) above today’s Lake Superior.</p> <p>The shoreline of Glacial Lake Beaver Bay was where you are standing, 243 feet (74 m) above Lake Superior.Mount Rose was an island and Mount Josephine was surrounded by water on three sides! If a lake lasted long enough for waves to work against the shoreline, there is evidence left behind – beaches and bluffs, sometimes high above the present lakeshore.</p> <p>The gentle slope before the Great Hall is the beach of Lake Sault, which had a shoreline 8 feet (2.4 m) above Lake Superior.</p>
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<p>This bench is at the junction of the two trails. One begins at the <a href="https://www.nps.gov/places/mount-rose-trailhead-depot.htm">Mount Rose Depot Trailhead</a>. The other begins at the <a href="https://www.nps.gov/places/mount-rose-trailhead-parking-lot.htm">Mount Ros…
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