The trailhead is along Sandwich Notch Road, which is closed in winter, and only vehicles with good clearance should attempt it. From Interstate 93, take Exit 28 to State Route 49 east toward Waterville Valley. After about 4 miles, turn right on Sandwich Notch Road and continue 5 miles until you see parking signs for the Guinea Pond Trail. Park down the dirt road on the right. From the parking area, head back to the road, turn right and head downhill; the trailhead is on the left just over the bridge.
I did this trail with my girlfriend and dog (adventure pug) a couple weekends ago.
The guinea pond trail has quite a bit of flooding and requires some bushwhacking, but it's doable.
The trail itself from the start of guinea pond to flat mountain pond is about 9.5 miles, but it's relatively flat. It took us about 4.5 hours on the way though (with 45 mins for breaks) and 3.5 hours on the way back.
Next time we'll be starting at a different trail head to avoid the guinea pond flooding.
Directions tell you to take Right at Y. This "Y" is almost non-existent at this point, the left fork now leading into the beaver pond. There is another Y only 10 yds past. Left fork leads to trail, right fork to power lines.
Very cool trail with many options for varying activity levels. Can "out-and-back" to any number of points for an easy beautiful walk or extend to a number of peaks including Mt Israel. Lots of wildflowers in the spring but also many ticks.
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