Skip to main content
U.S. flag

An official website of the United States government

Data

USGS has been collecting hydrologic data in Long Island Sound and its watershed for decades. Collected data include surface-water discharge, continuous and discrete groundwater levels and water-quality sampling. The data are used for a variety of purposes related to the management of water resources in the basin. Explore data releases below.

Filter Total Items: 21

Hydroacoustic Data to Support Embayment Monitoring in Long Island Sound, Southport and Saugatuck Embayments, Connecticut, 2022-2024 Hydroacoustic Data to Support Embayment Monitoring in Long Island Sound, Southport and Saugatuck Embayments, Connecticut, 2022-2024

This data release includes hydroacoustic data for the 2022 to 2024 water years at four stations. These stations are part of a discrete and continuous monitoring project in embayments on Long Island Sound to support nutrient management activities in Connecticut. The data were collected by the U.S Geological Survey (USGS) in cooperation with the Connecticut Departments of Energy and...

Water Quality Vertical Profile Data to Support Embayment Monitoring in Long Island Sound, Saugatuck and Sasco-Southport Embayments, Connecticut, 2022-2024 Water Quality Vertical Profile Data to Support Embayment Monitoring in Long Island Sound, Saugatuck and Sasco-Southport Embayments, Connecticut, 2022-2024

This data release includes vertical water-quality profile data collected from April 2022 to April 2024 at three locations in the Saugatuck River Embayment near Saugatuck, Connecticut, and two locations in the Mill River and one at the mouth of Sasco Brook near Southport Harbor, Connecticut, for the Sasco-Southport Embayment that discharge to Long Island Sound. These data were collected...

Hydroacoustic Water Velocity Data to Support Embayment Monitoring in Long Island Sound, Mystic, Norwalk, Saugatuck, and Sasco-Southport Embayments, Connecticut, 2021-2024 Hydroacoustic Water Velocity Data to Support Embayment Monitoring in Long Island Sound, Mystic, Norwalk, Saugatuck, and Sasco-Southport Embayments, Connecticut, 2021-2024

This data release includes hydroacoustic transect data collected in 2021, 2022, 2023, and 2024 water years at multiple locations throughout four embayments. These locations are part of a discrete and continuous monitoring project in embayments on Long Island Sound to support nutrient management activities in Connecticut. The transect data were collected by the U.S. Geological Survey...

Data to Assess Nitrogen Export from Forested Watersheds in and near the Long Island Sound Basin with Weighted Regressions on Time, Discharge, and Season (WRTDS) Data to Assess Nitrogen Export from Forested Watersheds in and near the Long Island Sound Basin with Weighted Regressions on Time, Discharge, and Season (WRTDS)

The U.S. Geological Survey, in cooperation with the U.S. Environmental Protection Agency's Long Island Sound Study (https://longislandsoundstudy.net), characterized nitrogen export from forested watersheds and whether nitrogen loading has been increasing or decreasing to help inform Long Island Sound management strategies. The Weighted Regressions on Time, Discharge, and Season (WRTDS...

Water quality vertical profile data to support embayment monitoring in Long Island Sound, Mystic and Norwalk Embayments, Connecticut, 2021-2023: U.S. Geological Survey data release Water quality vertical profile data to support embayment monitoring in Long Island Sound, Mystic and Norwalk Embayments, Connecticut, 2021-2023: U.S. Geological Survey data release

This data release includes vertical water-quality-profile data from April 2021 to April 2023 at four stations in the Mystic River embayment and three stations in the Norwalk River embayment in Connecticut. These stations are part of a discrete and continuous water-quality monitoring project in embayments on Long Island Sound to support nutrient management activities in Connecticut. The...

MODFLOW6 Groundwater Flow Model, MODPATH Particle-Tracking Simulation, and Groundwater-Transported Nitrogen Load Model of Average Monthly Conditions in Coastal Connecticut and Adjacent Areas of New York and Rhode Island, 1993 - 2022 MODFLOW6 Groundwater Flow Model, MODPATH Particle-Tracking Simulation, and Groundwater-Transported Nitrogen Load Model of Average Monthly Conditions in Coastal Connecticut and Adjacent Areas of New York and Rhode Island, 1993 - 2022

A groundwater flow model simulating average monthly conditions, using MODFLOW6, was developed to better understand groundwater flow and groundwater-transported nitrogen loads in coastal Connecticut and adjacent areas of New York and Rhode Island. Elevated nitrogen loads are a pervasive issue in the Long Island Sound, an estuary that receives freshwater and nutrients from both surface...

Summary Simulated Groundwater-transported Nitrogen Loads on the North Shore of Long Island Sound and Associated Data Summary Simulated Groundwater-transported Nitrogen Loads on the North Shore of Long Island Sound and Associated Data

A monthly model of groundwater-transported nitrogen loads was developed for 12-digit hydrologic unit code (HUC12) watersheds on the north shore of Long Island Sound in coastal Connecticut and adjacent areas of New York and Rhode Island. As part of the analysis, potential management actions that upgraded septic systems or reduced fertilizer application to areas of turf-grass were also...

Soil-Water-Balance Model Developed to Simulate Net Infiltration in Watersheds on the North Shore of the Long Island Sound Soil-Water-Balance Model Developed to Simulate Net Infiltration in Watersheds on the North Shore of the Long Island Sound

This model archive provides input and output for Soil-Water-Balance (SWB) models developed to simulate groundwater recharge (net infiltration) for a groundwater model of watersheds on the north shore of the Long Island Sound. The simulated groundwater recharge was further refined in the calibration of the groundwater flow model, which is published in a separate ScienceBase archive (https...

Hydroacoustic Data to Support Embayment Monitoring in Long Island Sound, Mystic and Norwalk Embayments, Connecticut, 2023 Hydroacoustic Data to Support Embayment Monitoring in Long Island Sound, Mystic and Norwalk Embayments, Connecticut, 2023

This data release includes six months of hydroacoustic data collected during the 2023 water year, starting October 1, 2022 and ending April 11, 2023. Data were collected at four stations that are part of a discrete and continuous monitoring project in embayments on Long Island Sound to support nutrient management activities in Connecticut. The data were collected by the U.S. Geological...

Nitrogen Loads, Yields, and Associated Field Data Collected During Baseflow Conditions and Site Attributes for Small Basins Draining to Long Island Sound Nitrogen Loads, Yields, and Associated Field Data Collected During Baseflow Conditions and Site Attributes for Small Basins Draining to Long Island Sound

During the spring and summer of 2022, the U.S. Geological Survey collected water-quality samples for nutrient analysis at 45 stations across the state of Connecticut and adjacent areas of New York and Rhode Island to better understand the groundwater discharge component of nitrogen loading to the Long Island Sound. The targeted stations were located in small drainage basins (less than 50...

Nitrogen Concentrations and Loads and Seasonal Nitrogen Loads in Selected Long Island Sound Tributaries, Water Years 1995-2021 (ver. 1.1, February 2024) Nitrogen Concentrations and Loads and Seasonal Nitrogen Loads in Selected Long Island Sound Tributaries, Water Years 1995-2021 (ver. 1.1, February 2024)

This U.S. Geological Survey (USGS) data release presents tabular data on nitrogen concentrations and loads for multiple nitrogen species, and river discharge data used in the analysis of data collected from October 1994 to September 2021. Data on flow and nitrogen concentrations were analyzed using the USGS Exploration and Graphics for RivEr Trends (EGRET) R package, and the method of...

Hydroacoustic Data to Support Embayment Monitoring in Long Island Sound, Mystic and Norwalk Embayments, Connecticut, 2021-2022 Hydroacoustic Data to Support Embayment Monitoring in Long Island Sound, Mystic and Norwalk Embayments, Connecticut, 2021-2022

This data release includes hydroacoustic data for the 2021 to 2022 water years at four stations. These stations are part of a discrete and continuous monitoring project in embayments on Long Island Sound to support nutrient management activities in Connecticut. The data were collected by the U.S Geological Survey (USGS) in cooperation with the Connecticut Department of Energy and...
Was this page helpful?