Annual winter-spring nitrogen loads for the Susquehanna and Potomac Rivers, 1985 to 2018

Winter-spring nitrogen loads as measured at the Susquehanna River at Conowingo Maryland and Potomac River at Washington, D.C. have been determined to be an effective indicator of summer anoxic and hypoxic volume in Chesapeake Bay. The U.S. Geological Survey (USGS) provides an estimate of winter-spring nitrogen loadings to support an annual forecast of summer Chesapeake Bay conditions. The specific period of estimation includes the months of January through May. This forecast is coordinated through an established relationship with the National Oceanic and Atmospheric Administration (NOAA), University of Maryland Center for Estuarine Science (UMCES) and Maryland's Department of Natural Resources. The results presented here are updated annually, and are revised as additional monitoring results are available. The results presented here cover the period 1985 through 2018.

Data and Resources

Field Value
accessLevel public
bureauCode {010:12}
catalog_@context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
catalog_conformsTo https://project-open-data.cio.gov/v1.1/schema
catalog_describedBy https://project-open-data.cio.gov/v1.1/schema/catalog.json
identifier USGS:5b118b5de4b092d9651bac44
metadata_type geospatial
modified 20200821
old-spatial -79.1675, 36.2085, -74.9048, 42.7144
publisher U.S. Geological Survey
publisher_hierarchy Department of the Interior > U.S. Geological Survey
resource-type Dataset
source_datajson_identifier true
source_hash dac563d61920565fbdc540041a6aa8b040287a16
source_schema_version 1.1
spatial {"type": "Polygon", "coordinates": [[[-79.1675, 36.2085], [-79.1675, 42.7144], [ -74.9048, 42.7144], [ -74.9048, 36.2085], [-79.1675, 36.2085]]]}
theme {geospatial}
Groups
  • AmeriGEOSS
  • National Provider
  • North America
Tags
  • amerigeo
  • amerigeoss
  • chesapeake-bay
  • ckan
  • geo
  • geoss
  • national
  • nitrogen-load
  • north-america
  • potomac-river
  • susquehanna-river
  • united-states
  • usgs-5b118b5de4b092d9651bac44
isopen False
license_id notspecified
license_title License not specified
maintainer Joel D Blomquist
maintainer_email jdblomqu@usgs.gov
metadata_created 2025-11-21T09:02:23.406889
metadata_modified 2025-11-21T09:02:23.406893
notes Winter-spring nitrogen loads as measured at the Susquehanna River at Conowingo Maryland and Potomac River at Washington, D.C. have been determined to be an effective indicator of summer anoxic and hypoxic volume in Chesapeake Bay. The U.S. Geological Survey (USGS) provides an estimate of winter-spring nitrogen loadings to support an annual forecast of summer Chesapeake Bay conditions. The specific period of estimation includes the months of January through May. This forecast is coordinated through an established relationship with the National Oceanic and Atmospheric Administration (NOAA), University of Maryland Center for Estuarine Science (UMCES) and Maryland's Department of Natural Resources. The results presented here are updated annually, and are revised as additional monitoring results are available. The results presented here cover the period 1985 through 2018.
num_resources 2
num_tags 13
title Annual winter-spring nitrogen loads for the Susquehanna and Potomac Rivers, 1985 to 2018