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Croton Hydrilla Control Project FIVE-YEAR MANAGEMENT PLAN NOVEMBER 30, 2018

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Croton Hydrilla Control Project FIVE-YEAR MANAGEMENT PLAN NOVEMBER 30, 2018 Croton Hydrilla Control Project FIVE-YEAR MANAGEMENT PLAN NOVEMBER 30, 2018 Andrew M. Cuomo, Governor | Basil Seggos, Commissioner Executive Summary The federally listed noxious weed Hydrilla DEC is the lead agency and the Bureau of verticillata (monoecious biotype) was first Invasive Species and Ecosystem Health discovered in New York State in 2008. Now (Division of Lands and Forests [DLF]) is the lead found in more than 10 counties, this invasive program on the Croton River Hydrilla Control plant is regulated by 6 New York Codes, Rules Project. In an effort to address the complexities and Regulations Part 575 Prohibited and of the project, DLF’s Invasive Species Regulated Invasive Species. Hydrilla is a high- Coordination Section (ISCS) staff have outlined priority species for New York and many other a five-year plan that relies heavily upon adaptive states because once it becomes established it is management. This plan describes the extremely difficult and expensive to remove. It foundation for the project resulting from several alters native habitats, impacts fisheries, prohibits years of studies, field surveys, and the water recreation, and affects local economies. experience of the New York Hydrilla Task Force With the exception of three infestations, the at other locations. The plan examines all majority of the hydrilla growth in New York is management options available and recommends confined to small, isolated ponds and lakes. The the best management practice for this site, three large-scale infestations in the state are which was implemented in 2017 (Year 1). Also located in the Cayuga Inlet/Fall Creek in Ithaca, outlined is the additional work (expanding Tompkins County/Aurora, Cayuga County; the communication, education and outreach, and Tonawanda Creek/Buffalo County, Erie Canal, assessing impacts) that needs to occur in order Niagara County; and the New Croton to support the project in the future. Flexibility is Reservoir/Croton River, Westchester County. essential for this project and assessments will Each infestation presents different challenges be conducted at the end of each season. Annual that influence management decisions. Control updates will provide an evaluation of the and management of the hydrilla infestation in previous season’s results. It is DEC’s intention Croton involves the New Croton Reservoir, to deliver a thorough and effective control and which provides drinking water for New York City; management plan that can serve as a template the upper Croton River which flows over the for other projects. wellfields and aquifers that provide drinking water for the Village of Croton-on-Hudson; public swimming and fishing areas; a trout fishery managed by New York State Department of Environmental Conservation (DEC) Region 3; rare plants; and tidal influence throughout at least onethird of the Croton River, which flows directly into the Hudson River. To date, control and management of the Croton infestation is the most complex invasive management project in New York. CROTON HYDRILLA CONTROL PROJECT | FIVE-YEAR MANAGEMENT PLAN i Contents Introduction ................................................................................................................................................. 1 Hydrilla in New York .................................................................................................................................. 1 Background ............................................................................................................................................... 1 Urgency for Response .............................................................................................................................. 3 Generic Hydrilla Management Options ..................................................................................................... 4 Croton Infestation Overview ...................................................................................................................... 6 Management Scenarios in the Croton River ............................................................................................. 7 New Croton Reservoir Management ......................................................................................................... 9 Results of 2016 Pilot Study ..................................................................................................................... 11 Outreach and Communication ................................................................................................................. 12 Educational Materials .............................................................................................................................. 12 Public Stakeholder Meetings ................................................................................................................... 12 Web Page ................................................................................................................................................ 12 Shoreline signs ........................................................................................................................................ 12 Monitoring .................................................................................................................................................. 14 Plants ...................................................................................................................................................... 14 Water ....................................................................................................................................................... 15 Control and Management ......................................................................................................................... 17 New Croton Reservoir ............................................................................................................................. 17 Croton River below Black Rock Dam to the mouth of the river ............................................................... 17 Croton Bay .............................................................................................................................................. 18 Adaptive Management ............................................................................................................................ 18 Ongoing Project Considerations ............................................................................................................. 18 Permitting ................................................................................................................................................ 18 Hydrilla Hunters ........................................................................................................................................ 20 Additional Impact Assessment ................................................................................................................ 21 Benthic Macroinvertebrate Survey .......................................................................................................... 21 Vallisneria Biotype Tests ......................................................................................................................... 21 Cyanobacteria Testing ............................................................................................................................ 21 Information About Fluridone.................................................................................................................... 22 Involved Staff and Stakeholders ............................................................................................................. 23 Literature Cited .......................................................................................................................................... 24 Additional Resources ............................................................................................................................... 25 Figure 1 Location Map Figure 2 Environmental Areas Figure 3 Preferred Treatment Figure 4 Limited Treatment ii CROTON HYDRILLA CONTROL PROJECT | FIVE-YEAR MANAGEMENT PLAN List of Acronyms CFS Cubic Feet per Second (1 cfs = 1.858 million gallons per day) DEC New York State Department of Environmental Conservation NYCDEP New York City Department of Environmental Protection DLF DEC Division of Lands and Forests DMM DEC Division of Materials Management DOH New York State Department of Health DOW DEC Division of Water EAF Environmental Assessment Form ELAP Environmental Laboratory Approval Program EPA United States Environmental Protection Agency NYNHP New York Natural Heritage Program OPRHP New York State Office of Parks, Recreation and Historic Preservation PPM Parts per Million (1 ppm = 1 milligram per liter) PPB Parts per Billion (1 ppb = 1 microgram per liter) PRISM Partnership for Regional Invasive Species Management SAV Submerged Aquatic Vegetation SEQR State Environmental Quality Review USACE United States Army Corps of Engineers USMA United States Military Academy CROTON HYDRILLA CONTROL PROJECT | FIVE-YEAR MANAGEMENT PLAN iii Introduction This document provides a five-year Background management plan for the control of Hydrilla verticillata, a highly invasive aquatic plant in the Hydrilla was reported in the Croton River, Croton River Watershed, in the towns of New York City’s New Croton Reservoir, and Cortlandt and Ossining, Westchester County, Croton Bay of the Hudson River in Westchester New York
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