William Clough Nature Preserve
Putnam County, NY
Patterson Environmental Park/Great Swamp
58 acres


Take Route 22 and turn west (left) onto Route 312 for 1.8 miles to the traffic light. Turn north (right) onto Farm-to-Market Road. Proceed 0.8 mile and turn left into preserve entrance across from a house (before Indian Hill Road). The entrance, usually noted with a wooden sign, is a single lane pull-off, with parking for 4 to 5 cars immediately on the left.


This preserve was donated to the Town of Patterson in 1973 by The Nature Conservancy.


There is a trail network. It goes from the parking area and branches into two major trails leading to the 46 acre Ice Pond. This is located in the "Towners Arm" of the Great Swamp. The left-hand trail goes through the woods. The right-hand trail skirts a wetland. Both trails rejoin just prior to the railroad tracks at the Ice Pond. The walk takes from 1 to 2 hours.

Ice Pond is a fairly big lake surrounded on three sides by mountains with a marsh area extending to the east like a big marshy finger. The railroad tracks run parallel to the eastern shore of Ice Pond. There are signs on the pond side saying "Private Property."

Saw quite a few trees with signs of beaver gnawing.

No canoe access.

Source: The Nature Conservancy 1996


Dr. Patrick L. Cooney and members of the Torrey Botanical Society (5/01/99)

Acer pensylvanica (goose-foot maple) ?
Acer rubrum (red maple) 4/22/04
Acer saccharum (sugar maple)
Amelanchier arborea (shadbush) 4/22/04 5/01/99
Betula alleghaniensis (yellow birch)
Betula lenta (black birch)
Betula populifolia (gray birch)
Carpinus caroliniana (musclewood)
Carya Sambucus racemosa (red elderberry)
Carya glabra (pignut hickory)
Carya ovata (shagbark hickory)
Crataegus sp. (hawthorn)
Fagus grandifolia (American beech)
Fraxinus americanus (white ash) 5/01/99
Juniperus virginiana (red cedar)
Ostrya virginiana (American hop hornbeam)
Picea abies (Norway spruce)
Picea sp. (spruce)
Pinus strobus (white pine)
Pinus sp. (pine) 2 needles, needles 2.5-4 inches; needles curved
Populus grandidentata (big-toothed aspen)
Prunus serotina (black cherry)
Quercus alba (white oak)
Quercus prinoides (chestnut oak)
Quercus rubra (red oak)
Quercus velutina (black oak)
Salix sp. (willow) 5/01/99
Sassafras albidum (sassafras)
Tsuga canadensis (eastern hemlock)

Alnus serrulata (smooth alder)
Berberis thunbergii (Japanese barberry) 5/01/99
Chimaphila maculata (spotted wintergreen)
Clethra alnifolia (sweet pepperbush)
Comptonia peregrina (sweet fern) on power cut
Cornus amomum (swamp dogwood)
Corylus sp. (cornuta)? (hazel)
Elaeagnus umbellata (autumn olive)
Eubotrys racemosa? (fetterbush?)
Euonymus alatus (winged euonymus)
Hamamelis virginiana (witch hazel)
Ilex verticillata (winterberry holly)
Kalmia latifolia (mountain laurel)
Ligustrum vulgare (common privet)
Lindera benzoin (spicebush) 4/22/04 5/01/99
Lonicera morrowii (Morrow's honeysuckle)
Lyonia ligustrina (maleberry)
Mitchella repens (partridgeberry)
Rhododendron periclymenoides (pinxter flower)
Rhododendron viscosum (swamp azalea)
Ribes sp. (rotundifolium?) (Appalachian gooseberry)
Rosa multiflora (multiflora rose)
Rubus alleghaniensis (common blackberry)
Rubus occidentalis (black raspberry)
Sambucus canadensis (common elderberry)
Sambucus racemosa (red elderberry)
Spiraea alba var. latifolia (meadowsweet)
Spiraea latifolia (meadowsweet)
Vaccinium angustifolium (lowbush blueberry) 5/01/99
Vaccinium corymbosum (high bush blueberry) 5/01/99
Vaccinium pallidum (hillside blueberry) 5/01/99
Viburnum acerifolium (maple-leaf viburnum)
Viburnum dentatum (arrowwood viburnum)
Viburnum prunifolium (blackhaw viburnum)
Vinca minor (periwinkle) 5/01/99

Lonicera dioica (honeysuckle)
Parthenocissus quinquefolius (Virginia creeper)
Toxicodendron radicans (poison ivy)

Achillea millefolium (yarrow)
Alliaria petiolata (garlic mustard) 5/01/99
Allium tricoccum (wild leek)
Anemone quinquefolia (wood anemone) 5/01/99
Arisaema triphyllum (Jack-in-the-pulpit) 5/01/99
Artemisia vulgaris (mugwort)
Asclepias incarnata (swamp milkweed)
Aster divaricatus (white wood aster)
Caltha palustris (marsh marigold) 5/01/99
Corydalis sempervirens (pale corydalis) 5/01/99
Daucus carota (Queen Anne's lace)
Erythronium americanum (trout lily)
Geranium maculatum (wild geranium)
Geum canadense (white avens)
Goodyera pubescens (rattlesnake plantain)
Hedyotis caerulea (bluets) 5/01/99
Impatiens capensis (orange jewelweed) 5/01/99
Lemna minor (lesser duckweed)
Ludwiagia palustris (water purslane)
Lythrum salicaria (purple loosestrife)
Maianthemum canadense (Canada mayflower)
Malus sp. (apple tree) 5/01/99 soon
Medeola virginiana (Indian cucumber root)
Monotropa uniflora (Indian pipe)
Oenothera biennis (common evening primrose)
Pachysandra terminalis (pachysandra) 4/22/04 5/01/99
Panax trifolium (dwarf ginseng) 5/01/99
Philadelphus sp. (mock orange)
Polygonatum pubescens (hairy true Solomon's seal)
Potentilla canadensis (dwarf cinquefoil) 5/01/99
Potentilla simplex (common cinquefoil)
Prenanthes sp. (lettuce)
Pyrola elliptica (pyrola)
Pyrola rotundifolia (round-leaved pyrola)
Ranunculus abortivus (kidney-leaved buttercup) 5/01/99
Smilacina racemosa (false Solomon's seal)
Solidago spp. (goldenrods)
Stylophorum diphyllum (celandine poppy) 4/22/04; 5/01/99 probably planted and escaped into preserve
Symplocarpus foetidus (skunk cabbage)
Taraxacum officinale (dandelion) 5/01/99
Thalictrum pubescens (tall meadowrue)
Trillium erectum (wake robin trillium) 4/22/04 5/01/99
Typha latifolia (broad-leaved cattail)
Uvularia sessilifolia (sessile-leaved bellwort) 5/01/99
Veratrum viride (swamp hellebore)
Verbascum thapsus (common mullein)
Viola blanda (white violet) 4/22/04 5/01/99
Viola conspersa (American dog violet) 5/01/99
Viola sagittata (arrowhead violet) 4/22/04 5/01/99
Viola sororia (common blue violet) 4/22/04 5/01/99

Luzula multiflora (multiflora wood rush) 5/01/99

Carex laxiflora (loose-flowered sac sedge)
Carex pensylvanica (Pennsylvania sedge) 4/22/04 5/01/99
Carex stricta (tussock sedge)

Andropogon virginicus var. virginicus (broom sedge)
Panicum clandestinum (deer-tongue grass)
Phragmites australis (giant reed grass)
Schizachyrium scoparium (little blue stem grass)

Ferns and Fern Allies:
Equisetum arvense (field horsetail) 5/01/99
Equisetum hyemale (scouring rush horsetail)
Lycopodium clavatum (common clubmoss)
Lycopodium digitatum (ground cedar)
Lycopodium lucidulum (shining clubmoss)
Lycopodium obscurum (ground pine)
Athyrium filix-femina (lady fern)
Dennstaedtia punctilobula (hay-scented fern)
Dryopteris intermedia (evergreen wood fern)
Onoclea sensibilis (sensitive fern)
Osmunda cinnamomea (cinnamon fern)
Polypodium appalachianum (rock cap fern)
Polystichum acrostichoides (Christmas fern)