| Main Line Trail | | |
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| Maloney Trail Number 5 | | |
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| Many Falls Trail | | |
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| May Creek Trail and Ridge Trail | Beaverhead-Deerlodge National Forest | 5.5 |
| The May Creek Ridge Trail (More Difficult) begins at the May Creek Campground and continues southwest where it joins the Cabinet Creek Trail. The May Creek Trail (Most Difficult) begins from the west end of the May Creek Ridge Trail and provides a chan... |
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| McCabe Lake Creek Trail | | |
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| McCormick Creek Trail | | |
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| McDermott Trail | | |
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| McDonald Creek Trail | | |
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| McGuire Creek Trail | Kootenai National Forest | 4.5 |
| This trail is an easy hike with very few steep pitches. It follows McGuire Creek for the entire length and is close to the creek the last 2 miles. Small cutthroat trout have been seen in the creek. |
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| Meadow Creek Trail | | |
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| Meadow Creek Trail | Helena National Forest | 4 |
| Facilities at the trailhead include an unloading and turn around area with plenty of parking available. The trail begins as a road, but soon changes to a trail and begins switchbacking up the hill. The climb lasts for about three miles then levels off ... |
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| Meadow Ridge Trail | | |
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| Medicine Grizzly Trail | | |
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| Micho Trail | | |
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| Mill Creek Trail | | |
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| Miller Creek | Kootenai National Forest | 1.8 |
| The trail accesses the Libby Divide/Horse Mountain Trail System. This trail makes a nice family day hike. |
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| Miller Creek Trail | | |
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| Miller Ridge | Kootenai National Forest | 4.5 |
| This trail offers a ridgetop hiking or stock use experience. Starting on a fairly steep slope, the trail switchbacks up to a more gentle ridgetop mid-section, followed by a short climb to the Libby Divide trail. The ridgetop offers many outstanding vie... |
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| Miller Trail | | |
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| Miner Creek Trail | | |
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| Miner Lake Trail | Beaverhead-Deerlodge National Forest | 3.6 |
| Park and begin snowmobiling 1 mile to the Forest boundary where the ungroomed trail begins. Miner Lake is 3 1/2 miles from the Forest boundary. |
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| Mineral Creek Trail | | |
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| Missouri Beaver Creek | Helena National Forest | 2.5 |
| Although the trail grade is generally level, there are a few steeper sections under 100 yards long. Please note also, a portion of the trail proceeds over rocky terrain. Hikers should stay on the developed trail to avoid the dangers of rolling rocks. T... |
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| Missouri Canyon Trail | Helena National Forest | 4 |
| Starting at Meriwether Campground this trail is level for the first 2 miles to Fields Gulch. The trail is in the woods along the river with spectacular views of the limestone cliffs and river. Water and picnic tables are available at the halfway point,... |
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| Monture Haun Trail | | |
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