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LIS Dredged Material Disposal Sites

Metadata Updated: February 9, 2024

LIS Dredged Material Disposal Sites is a polygon feature-based layer that depicts the official locations of the four active (currently used) sites for depositing sediments approved for open water disposal in Long Island Sound. It does not include historic or discontinued disposal sites. The layer was compiled initially between 1999 and 2001 and depicts current conditions. Compilation scale is unknown. Attribute information is comprised of codes to uniquely identify individual features (locations of dredge disposal sites), encode the features, and cartographically represent (symbolize) these features on a map. This layer is updated as needed. Disposal activities in Long Island Sound are regulated by the following Federal statutes: the Clean Water Acts of 1977, the Coastal Zone Management Act, the Endangered Species Act of 1973, the Marine Protection, Research, and Sanctuaries Act of 1972, the National Environmental Policy Act of 1969, the Fish and Wildlife Coordination Act of 1958, and the Rivers and Harbors Act of 1899. In addition to Federal oversight, both Connecticut and New York also regulate open water disposal in the waters of Long Island Sound. In Connecticut, authority stems from the state's Structures, Dredging and Fill statute, the Tidal Wetlands statute, and the Connecticut Coastal Management Act. In New York, disposal is regulated through the Use and Protection of Waters Regulation, the Tidal Wetlands Use Regulations, the Coastal Erosion Management Regulations, the State Environmental Quality Review Act, the State Historic Preservation Act, the Waterfront Revitalization and Coastal Resources Act, and the New York Coastal Management Program. The practice of open water disposal in Long Island Sound utilizes one of the following management strategies: 1. Unconfined Open Water Disposal: A process by which material deemed to be environmentally safe is deposited at a given site. 2. Confined Open Water Disposal: A process by which sediments not suitable for unconfined open water disposal are deposited and then covered or "capped" with environmentally safe material. A variation of this method occurs when previous sediment mounds are used to form a ring into which material not suitable for unconfined open water disposal can be placed and then capped accordingly. The datalayer was originally created from information provided by: (1) Carey, D., Valente R., Murray P., and Rhoads, D. 1998. State of Connecticut Dept. of Environmental Protection Office of Long Island Sound Programs Dredged Sediment Management Study: Long Island Sound Dredged Material Management Approach. SAIC Peport No. 442, Science Applications International Corporation. Appendix F.; and (2) Various US ACOE DAMOS Monitoring Cruise Reports, 1991-2000. Updates for the 2005 edition included information from The Final Rulemaking and Response to Comments Document for the Final Environmental Impact Statement (FEIS) for the Designation of Dredged Material Disposal Sites in Central and Western Long Island Sound, US Environmental Protection Agency, May 19, 2005.

As part of the overall management approach, the four sites have been extensively monitored by the US Army Corps of Engineer's (ACOE) Disposal Area MOnitoring System (DAMOS) since 1977. Each site is briefly summarized as follows: Western Long Island Sound Disposal Site: The Western Long Island Sound Disposal Site (WLIS) is located 4.63 km south of Long Neck Point, CT. Dredged material has been deposited annually at the 5.35 km2 site since 1982 and consists mainly of fine silts and clays. Sensitive local resources and public concern limit disposal to material with only low levels of contamination, therefore, only unconfined open water disposal is employed. WLIS has been extensively monitored by the DAMOS program since the mid 1980's. Feature data updated as of 2005. Central Long Island Sound Disposal Site: The Central Long Island Sound Disposal Site (CLIS) was designated in 1979 and incorporates a previous disposa

Access & Use Information

Public: This dataset is intended for public access and use. Non-Federal: This dataset is covered by different Terms of Use than License: Creative Commons CCZero

Downloads & Resources


Metadata Created Date September 2, 2022
Metadata Updated Date February 9, 2024

Metadata Source

Harvested from Connecticut Data.json

Additional Metadata

Resource Type Dataset
Metadata Created Date September 2, 2022
Metadata Updated Date February 9, 2024
Publisher Department of Energy & Environmental Protection
Data First Published 2018-12-21
Data Last Modified 2019-10-18
Category geospatial
Public Access Level public
Metadata Context
Metadata Catalog ID
Schema Version
Catalog Describedby
Harvest Object Id 176bba0f-8c2a-4986-b425-e3459595395e
Harvest Source Id 36c82f29-4f54-495e-a878-2c07320bf10c
Harvest Source Title Connecticut Data.json
Homepage URL
Metadata Type geospatial
Old Spatial -73.4964,40.9815,-72.0655,41.2793
Source Datajson Identifier True
Source Hash ea3dc3ad1f732c7ce89dc2636768aa423bdf060c1f920ae80e6513249a3e660a
Source Schema Version 1.1
Spatial {"type": "Polygon", "coordinates": -73.4964, 40.9815, -73.4964, 41.2793, -72.0655, 41.2793, -72.0655, 40.9815, -73.4964, 40.9815}

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