| Soil mass and chemistry in 25 Catskill headwater catchments | Participant | 2010-06-01 | 2014-05-31 |
| New York City Watershed Lands Forest Inventory | Participant | 2002-01-02 | Ongoing |
| New York City Watershed Lands Forest Stand Delination | Participant | 2003-01-01 | Ongoing |
| New York City Water Supply Stream Sampling | Participant | 1987-01-01 | Ongoing |
| New York City Water Supply Reservoir Monitoring | Participant | 1987-01-01 | Ongoing |
| New York City DEP Wastewater Treatment Plants Monitoring | Participant | 1987-01-01 | Ongoing |
| Catskill Mountains Vegetation Sampling | Participant | 1997-01-01 | 2000-12-31 |
| Catskill Mountains Vegetation Cover Maps | Participant | 1997-01-01 | 2001-08-01 |
| New York City DEP Reference Wetlands Monitoring | Participant | 2004-06-01 | Ongoing |
| New York City DEP Catskills Meteorological Data | Participant | 1996-01-01 | Ongoing |
| New York City DEP Snow Surveys | Participant | 1963-01-01 | Ongoing |
| Surveillance Monitoring for Invasive Species in New York City DEP Reservoirs | Participant | 1992-01-01 | Ongoing |
| Catskill Mountains Nitrogen Fertilization Study | Participant | 1997-07-01 | 2010-09-30 |
| New York City DEP Seasonal Pool Wetland Monitoring | Participant | 2010-04-01 | Ongoing |
| Adirondack and Catskill Stream Fish Survey | Participant | 2012-01-01 | 2017-12-31 |
| USGS Stream Gages | Participant | 1931-10-01 | Ongoing |
| National Atmospheric Deposition Program (NADP) - Mercury Deposition Network (MDN) | Participant | 2004-03-09 | Ongoing |
| Clean Air Status and Trends Network (CASTNET) | Participant | 1994-05-01 | Ongoing |
| National Oceanic and Atmospheric Administration (NOAA) Weather Stations | Participant | 1924-06-01 | Ongoing |
| Visitors’ Perceptions of Trail Registries in the Catskill Park | Participant | 2019-05-29 | 2019-08-20 |
| Catskill Mountains Stream Restoration Study | Participant | 2020-05-01 | 2020-12-01 |
| Hydrocarbons in Upland Groundwater, Marcellus Shale Region, Northeastern Pennsylvania and Southern New York, U.S.A. | Participant | 2017-06-05 | 2017-09-05 |
| Stream chemistry in 27 Catskills headwater streams (2010-2013) | Participant | 2010-06-01 | 2013-07-31 |
| Reducing human-black bear conflicts in the Catskills | Participant | 2020-04-01 | 2020-12-01 |
| Point Assessment Trail Monitoring | Participant | 2022-05-01 | 2022-12-31 |
