New Hampshire Route 10
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Map of New Hampshire with NH 10 highlighted in red (this includes the section cosigned along US 302)
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| Route information | ||||
| Maintained by NHDOT | ||||
| Length: | 122.476 mi (197.106 km) | |||
| Existed: | 1922 – present | |||
| Major junctions | ||||
| South end: |
 Route 10 in Northfield, MA
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| North end: |
 US 302 in Haverhill
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| Location | ||||
| Counties: | Cheshire, Sullivan, Grafton | |||
| Highway system | ||||
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New Hampshire Route 10 is a 122.25-mile-long (196.74 km) north–south state highway in western New Hampshire, United States. Its southern terminus is in Winchester at the Massachusetts state line, where it continues south as Massachusetts Route 10. Administratively, the northern terminus is at a junction with U.S. Route 302 in Haverhill.
In the field, however, NH 10 is cosigned along US 302 for an additional 19.8 miles (31.9 km) from Haverhill to an intersection with New Hampshire Route 18 in Littleton. However, this is not officially part of the route.
NH 10 is a multi-state route along with Massachusetts Route 10 and Connecticut Route 10. Its number is derived from its original 1922 designation as New England Interstate Route 10.
NH 10 begins at the Massachusetts state line in Winchester, where it connects to Massachusetts Route 10. It runs northeast into the town center where it intersects with NH 78 and NH 119. NH 119 joins NH 10 briefly before splitting off to the east. NH 10 continues north along the Ashuelot River, through the town of Swanzey and into the city of Keene. NH 10 meets NH 12 and NH 101 at a traffic circle near Keene State College and turns west, joining the latter two routes to their intersection with NH 9. At this intersection, NH 101 ends while NH 10 and NH 12 turn north onto NH 9 eastbound. The three overlapped routes pass west of downtown Keene for just over 1⁄2 mile (0.80 km), then NH 9 and NH 10 exit NH 12 at a trumpet interchange and turn northeast. NH 9 and NH 10 remain overlapped for another 2.8 miles (4.5 km) before NH 10 splits off to the north and crosses into the town of Gilsum.
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