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Sandyhook Soils

Soil Map Unit Description from the RI Soil Survey Report (2010 Update)

Sa - Sandyhook mucky peat, 0 to 3 percent slopes (2010 Update for the RI Coastal Zone Soil Survey Phase I - please download the latest copy of the spatial data).

This nearly level, very poorly drained soil is in tidal marshes and is subject to tidal flooding. Most areas are in salt marshes, some areas are in brackish phragmites marshes. Slopes are dominantly less than 3 percent.

Typically this soil has a surface layer of very dark gray mucky peat less than 8 inches thick. The underlying material is gray to black sand to a depth of 60 inches or more.

Included with this soil in mapping are a few small areas of very poorly drained Ipswich, Pawcatuck, and Matunuck soils on similar positions. Succotash and Fortress soils are on higher elevations, and Nagunt, Marshneck, and Massapog soils are in permanently submersed areas. Some areas have human transported dredge material in the surface layers. Included areas make up about 5 percent of this map unit.

The permeability of this soil is rapid in the surface layer, rapid to very rapid between depths of about 12 and 18 inches, and very rapid at a depth of more than 18 inches. Available water capacity is low. Runoff is very slow, and water is ponded on some areas. The soil is strongly acid through neutral.

The daily tidal flooding and a high salt content make this soil unsuitable for most uses except as habitat for saltwater-tolerant wildlife. Capability subclass VIIIw; not assigned to a woodland group.

Sandyhook soils are HYDRIC soils associated with wetlands which are protected from disturbance under state and Federal law. Any work done in or near this soil should be conducted following the proper permit procedures.

Official Series Description:

UPDATE: The Coastal Zone of Rhode Island is currently being updated and re-mapped, for more information on this update visit: