Indian Brook Assemblage of the Nature Conservancy

Mildred E. Grierson Sanctuary/Marian Yarrow Nature Preserve
The Mildred E. Grierson Sanctuary, Marian Yarrow Nature Preserve and the Mt. Holly Nature Preserve comprise the Indian Brook Assemblage of over 100 acres owned by the Nature Conservancy. They are important as a wildlife refuge and as part of the NYC Watershed system. Because of the sensitive flora and fauna in the area, hikers should keep to the well marked trails.
The five acre pond in the Grierson Sanctuary can be observed from Todd Road where there is a foot path entrance. These spring fed ponds and wetlands are a haven for migratory water fowl and other bird life. They are also populated with fish, reptiles, and turtles. Beyond the ponds the trail leads up a steep hill to 13 acres of hard wood forests and a stone wall which marks the boundary of the Marion Yarrow Preserve.
The Marion Yarrow Preserve entrance is on Mt. Holly Road. Next to the small parking area there is a box containing maps. Loop trails, (yellow, red, white and blue) lead to Hidden Lake, a twenty foot waterfall and a wooded marshland.

Directions: At the intersection of rt. 121 N and rt. 35, turn onto rt. 121N. Follow rt. 121 and turn left onto Todd Road. Turn left onto Mount Holly Road. The Preserve entrance is up the hill on your left.

Mt. Holly Nature Preserve
The Mt. Holly Nature Preserve, once a dairy farm, has many stone walls dating back to the 1700's. Among the diverse physical features are a large stand of beech trees, 22 acres of meadows and rock cliffs. It is excellent bird watching territory. Indian Brook runs south along the eastern boundary. The trail affords a moderately level and easy walk.

Directions: At the intersection of rt. 121 N and rt. 35, turn onto rt. 121N. Follow rt. 121 and turn left onto Todd Road. Turn left onto Mount Holly Road. Take your second left onto Mt. Holly Road East. The park entrance will be approximately ½ mile on your left.


Mildred E. Grierson Sanctuary/Marian Yarrow Nature Preserve The Mildred E. Grierson Sanctuary, Marian Yarrow Nature Preserve and the Mt. Holly Nature Preserve comprise the Indian Brook Assemblage of over 100 acres owned by the Nature Conservancy. They are important as a wildlife refuge and as part of the NYC Watershed system. Because of the sensitive flora and fauna in the area, hikers should keep to the well marked trails. The five acre pond in the Grierson Sanctuary can be observed from Todd Road where there is a foot path entrance. These spring fed ponds and wetlands are a haven for migratory water fowl and other bird life. They are also populated with fish, reptiles, and turtles. Beyond the ponds the trail leads up a steep hill to 13 acres of hard wood forests and a stone wall which marks the boundary of the Marion Yarrow Preserve. The Marion Yarrow Preserve entrance is on Mt. Holly Road. Next to the small parking area there is a box containing maps. Loop trails, (yellow, red, white and blue) lead to Hidden Lake, a twenty foot waterfall and a wooded marshland. Directions: At the intersection of rt. 121 N and rt. 35, turn onto rt. 121N. Follow rt. 121 and turn left onto Todd Road. Turn left onto Mount Holly Road. The Preserve entrance is up the hill on your left. Mt. Holly Nature Preserve The Mt. Holly Nature Preserve, once a dairy farm, has many stone walls dating back to the 1700's. Among the diverse physical features are a large stand of beech trees, 22 acres of meadows and rock cliffs. It is excellent bird watching territory. Indian Brook runs south along the eastern boundary. The trail affords a moderately level and easy walk. Directions: At the intersection of rt. 121 N and rt. 35, turn onto rt. 121N. Follow rt. 121 and turn left onto Todd Road. Turn left onto Mount Holly Road. Take your second left onto Mt. Holly Road East. The park entrance will be approximately ½ mile on your left. .
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