All Data

The Maumee River basin is the largest watershed in the Great Lakes region and plays a critical role in managing runoff into western Lake Erie. Despite decades of implementing improved field management strategies aimed at reducing nutrient inputs, particularly phosphorus (P), the persistence of nuisance and harmful algal blooms indicates that sediment- bound P from in-stream and legacy...

This data release contains input and output files for fifteen (15) MODFLOW 6 models that simulate future groundwater nitrogen transport under potential nitrogen management decisions. The development approach for the flow and transport models is described in Jahn and Walter (2026). Each scenario adjusts nitrogen inputs (Monti and others, 2024) based on communication with local...

We computed mean groundwater ages and age distributions at eight wells by calibrating lumped parameter models (LPMs) to concentrations of tracers (3H, CFCs, SF6) in samples using the computer program TracerLPM (Jurgens and others, 2012). We also measured 14C but all samples contained ancient carbonate from the limestone bedrock, and we were unable to resolve the atmospherically-derived...

The dataset presents 5- or 15-minute data for turbidity and Fluorescent Dissolved Organic Matter (FDOM) measured by in-stream sensors at the USGS gage Rio Icacos near Naguabo (50075000), Luquillo Experimental Forest, Puerto Rico. The measurement period was 10 March, 2017 to 1 March, 2019. The USGS sensors were co-located with sensors for nitrate and specific conductance operated by...

This data release supports publications on the Sleepers River Research Watershed near Danville, Vermont. Most of the research at Sleepers River takes place at W-9, the 40.5-hectare forested headwater site. Topics include understanding hydrologic flow paths, biogeochemical cycling, and organic carbon dynamics. Flow and precipitation data are integral to understanding these processes, for...

This data release presents water-quality and streamflow data from 12 streams on Cape Cod, Massachusetts, which were used to identify potential land areas that are sources of high nitrogen loading from groundwater directly to streams. The sources of nitrogen loading to groundwater in this region include wastewater from septic systems and fertilizer and stormwater runoff. Streamflow in the...

The dataset includes identification, densities, and dry masses of aquatic invertebrates and crustaceans sampled in benthic and water column habitats of Great Basin terminal lakes in California, Nevada, Oregon, and Utah during 2024 and 2025

This dataset provides details from stream metabolism models for 11 stream sites in Connecticut that were monitored during 2015 to 2018 by the U.S. Geological Survey (USGS). Metabolism was estimated at each site using the streamMetabolizer package in the R computing environment. When data were collected for multiple years at a site, stream metabolism was separately estimated for each year...

This data release documents nitrate-nitrogen concentration, groundwater ages, age-weighted nitrogen loads, and aquifer and other characteristics that could be used to model time-varying nitrate concentration in groundwater on Long Island, New York. Concentration data consist of median annual nitrate concentrations at approximately 700 supply wells from 1988 to 2019 based on data provided...

We captured Mohave ground squirrels from four study sites in the Coso Range, California, between 1988 and 2021. This dataset includes capture and recapture records of squirrels at each site and individual and environmental variables associated with those records. We used these data in a mark-recapture analysis to estimate six demographic parameters of Mohave ground squirrels: survival...

Various water variables, including dissolved inorganic nutrients, total alkalinity, dissolved inorganic carbon, and carbon and oxygen isotopes were measured in samples collected using both a Niskin-bottle rosette and Niskin-bottle attached to a ROV at selected depths from sites along the Aleutian Arc in June and July 2025 during the R/V Atlantis Ship AT50-38 (USGS field activity 2025-307...

This is accompanying data produced for the study "Implications of Model Selection: Inter-Comparison of Publicly-Available, CONUS-Extent Hydrologic Component Estimates". These datasets were converted from their primary structures (rasters and shapefiles) to EPA Ecoregions Level I. Conversion was performed by averaging timestep layers via mean area weight to produce a single vector of...