The Lost River is a 4.0-mile-long (6.4 km)[1] stream in the White Mountains of New Hampshire in the United States. It is a tributary of Moosilauke Brook, part of the Pemigewasset River watershed leading to the Merrimack River.[2]

Lost River
Lost River c. 1908
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Location
Country	United States
State	New Hampshire
County	Grafton
Town	Woodstock
Physical characteristics
Source	Mount Moosilauke
• location	White Mountain National Forest
• coordinates	44°1′58″N 71°47′58″W
• elevation	2,640 ft (800 m)
Mouth	Moosilauke Brook
• location	Woodstock
• coordinates	44°1′11″N 71°44′5″W
• elevation	980 ft (300 m)
Length	4.0 mi (6.4 km)
Basin features
Tributaries
• right	Walker Brook

The Lost River begins on the eastern slopes of Mount Moosilauke below the peak of Mount Jim and above Kinsman Notch, one of the major passes through the White Mountains. As it flows through the notch, it passes through Lost River Gorge, an area where enormous boulders falling off the flanking walls of the notch at the close of the last Ice Age have covered the river, creating a network of boulder caves. The gorge is owned by the Society for the Protection of New Hampshire Forests and is operated as a tourist attraction, with trails and ladders accessing many of the caves.

The river flows southeast from Kinsman Notch to Jackman Brook, where the two streams form Moosilauke Brook, which continues northeast through the granite gorge of Agassiz Basin and joins the Pemigewasset River in the village of North Woodstock.

New Hampshire Route 112 follows the Lost River from Kinsman Notch to Moosilauke Brook.

See also

• List of rivers of New Hampshire

References

External links

• Lost River Gorge & Boulder Caves website