Diamond Mountain/Stony Brook Loop


This loop hike at the southern end of Harriman State Park follows several picturesque streams and climbs to a viewpoint over Lake Sebago.

4 hours
6.3 miles
Route Type:
Allowed on leash
Views, Public Transportation, Historic feature
First Published:

Daniel Chazin


Harriman State Park. View over Lake Sebago. Photo by Daniel Chazin.


View Reeves Meadow Visitor Center in a larger map

Trail Conference volunteers maintain trails in this park.
Trailhead GPS Coordinates
Driving Directions

Take N.J. Route 17 north to the New York State Thruway and take the first exit, Exit 15A (Sloatsburg). Turn left at the bottom of the ramp onto N.Y. Route 17 north, and continue through the Village of Sloatsburg. Just past the village, turn right at the traffic light, following the sign for Harriman State Park. Cross an overpass over railroad tracks and continue along the Seven Lakes Drive, passing under the Thruway overpass, and soon entering Harriman State Park. Proceed for another mile (from the Thruway overpass) to the Reeves Meadow Visitor Center, on the right side of the road. Park in the Visitor Center parking lot.


Take the NJ Transit/Metro-North Port Jervis Line to the Sloatsburg station. From the station, cross the railroad tracks and head north on Ballard Avenue. When Ballard Avenue ends, turn right onto Academy Avenue and continue to Seven Lakes Drive. Turn right on Seven Lakes Drive, continue under the New York State Thruway, and pass Greenway Road and Laurel Road on the right. A short distance beyond, about 0.9 mile from the train station, you'll reach a bridge over the Stony Brook. On the bridge, you will notice a triple red-square-on-white blaze and a directional arrow, which mark the trailhead of the Pine Meadow Trail. Turn right, leaving the road, and follow this red-on-white-blazed trail for another 0.8 mile to the Reeves Meadow Visitor Center.


From the parking lot, head east (left when facing the woods), passing the Visitor Center to the left. You are following the red-on-white-blazed Pine Meadow Trail, which parallels Stony Brook, on the left. The trail follows a wide woods road, with a detour onto a footpath to the right to avoid a wet and rocky section of the road. After following this wide route for 0.4 mile, you’ll come to fork. The yellow-blazed Stony Brook Trail, which proceeds straight ahead, will be your return route, but you should bear right and continue along the red-on-white-blazed Pine Meadow Trail, which begins to climb.

Soon, the trail crosses Quartz Brook (a footbridge has been installed on the right, but it is easier to cross the brook on rocks when the water is low). Just beyond, the trail crosses a gas pipeline right-of-way, and it continues to follow a wide path along the hillside, high above Stony Brook (which can be heard below to the left). 

About a mile from the start, an unmarked trail on the left descends on steps, but you should bear right to continFootbridge over Pine Meadow Lake just above Cascade of Slid. Photo by Daniel Chazinlue along the red-on-white blazed Pine Meadow Trail. A short distance beyond, you’ll reach a junction with the orange-blazed Hillburn-Torne-Sebago Trail, which leaves to the left. Turn left and follow this trail down to Pine Meadow Brook, which is crossed on a footbridge just above the scenic Cascade of Slid. On the other side of the bridge, turn right onto the white-blazed Kakiat Trail, which follows the north side of the brook. In another third of a mile, the blue-on-white Seven Hills Trail joins, and a complex junction is reached just beyond. The Kakiat and Seven Hills Trails turn right to cross the brook on another wooden footbridge, but you should continue straight ahead (do not cross the bridge), now once again following the red-on-white-blazed Pine Meadow Trail.

The trail ascends gradually through mountain laurel thickets, with the brook to the right. In another quarter mile, several huge boulders may be seen to the right. These boulders are known as Ga-Nus-Quah (Stone Giants). There are attractive cascades in the brook here, and open rock ledges just beyond are a good spot to take a break.

After proceeding through a fairly level area, the Pine Meadow Trail bears left and reaches a stone foundation, topped by concrete pillars – the remains of a building that served as the headquarters for several Civilian Conservation Corps camps in the 1930s. The “CCC boys” built several lakes in the area and the infrastructure for children’s camps around the lakes, but the camps themselves were never completed. A broken, rusty pipe atop the foundation is a remnant of a water system installed but never used.Stony Brook Cascade. Photo by Daniel Chazin.

A short distance beyond, you’ll reach a junction with the yellow-blazed Diamond Mountain-Tower Trail. Here, the Pine Meadow Trail bears right and descends, but you should continue straight ahead, now following the yellow blazes of the Diamond Mountain-Tower Trail. Soon, you’ll pass a large concrete structure below on the right. This structure was built in 1934 to serve as a septic tank, but it was never put into operation.

Soon, the yellow-blazed trail turns left and begins a rather steep climb of Diamond Mountain, with views of Pine Meadow Lake below. Near the top, the trail turns right and runs along open rock ledges, which afford views to the right over Pine Meadow Lake (to the right) and Lake Wanoksink (to the left). The yellow trail then bends to the left and descends slightly to end at a junction with the blue-on-white-blazed Seven Hills Trail. 

Turn right onto the Seven Hills Trail, which heads northeast along the ridge of Diamond Mountain. Soon, the trail comes out on open rocks, with a panoramic view to the north of Lake Sebago. This is another good place for a break. Continue ahead along the Seven Hills Trail, which briefly joins a woods road and then turns left, leaving the road, and descends.

About a quarter mile after leaving the road, you’ll reach a junction with the Tuxedo-Mt. Ivy Trail, blazed with a red dash on white. Turn sharply left and follow the Tuxedo-Mt. Ivy Trail downhill through thick mountain laurel thickets. The trail crosses Diamond Creek, climbs a minor rise, then descends to reach a junction with the orange-blazed Hillburn-TConcrete Pillars of the abandoned CCC headquarters. Photo by Daniel Chazin.orne-Sebago Trail just before Stony Brook.

Turn left and follow the orange blazes. In about 500 feet, the orange blazes turn left again and proceed uphill, but you should continue ahead on the yellow-blazed Stony Brook Trail, which begins here. For the next two miles, the Stony Brook Trail parallels the scenic Stony Brook, which is to the right. At first, the trail detours to the left to cross Diamond Creek, but for most of the way, it runs close to Stony Brook. 

In about a mile and a half, the Stony Brook Trail is joined by the white-blazed Kakiat Trail, which comes in from the left, and both trails bear left to cross a footbridge over Pine Meadow Brook. A short distance beyond, the Kakiat Trail leaves to the right, but you should continue ahead on the yellow-blazed Stony Brook Trail.

After crossing a gas pipeline right-of-way, the trail crosses Quartz Brook (a footbridge has been provided on the left, but it’s easier to cross the brook on rocks when the water is low). A short distance beyond, the Stony Brook Trail ends at a junction with the red-on-white-blazed Pine Meadow Trail. Continue ahead, retracing your steps on the Pine Meadow Trail back to the parking lot where the hike began.

Comment: Please be relevant, civil, non-commercial.

Excellent Hike

Did this hike today.  Can I say it is an amazing hike.  I agree that this should be rated easy to moderate as the only tough part is the climb up Diamond Mountain and the rocky terrain.   Other than that this hike is beautiful.  Lots of following water, scenery changes and plenty of places along the way to enjoy a Zen moment.   I will defintely be hiking this loop again.

More of an Easy to Moderate Hike

Did this hike on Sunday (3/6/16).  Other than the short steep ascent up to Diamond Mountain, the rest of the hike was rather easy wth lots of rock gardens to maneuver through.  Should be added to Easy to Moderate category instead of Moderate hike category.   Also, if you miss the turn off to the left after the footbridge above Cascade of Slid and continue on the Hillburn-Torne-Sebago Trail straight, you can get back on to the hike further by following the H-T-S Trail straight to the next footbridge about a mile further (where it hooks up with the Kakiat Trail and the Seven Hills Trail coming from the left (the other side of the brook).  Cross the footbridge and then get back on the red-on-white blazed Pine Meadow Trail going to the right after you cross bridge.

Bridge has been replaced

We did this hike today, and found that we could do the hike as originally described - the bridge on the orange blazed trail has been replaced. Nice hike, with views on Diamond Mountain. We saw a lot of blood in the snow on the Stony Brook Trail. Eventually we came upon a dead deer on the side of the trail. Here are some photos: http://www.agiletrekker.blogspot.com/2015/03/diamond-mountainstony-brook-loop.html