State of Conservation
Category of site
Cultural site Natural site Mixed site
Site inscribed on the List of World Heritage in Danger
Cultural site Natural site Mixed site
States Parties
United States of AmericaThreats
Surface water pollution 39 Housing 38 Water infrastructure 27 Storms 24 Invasive / alien freshwater species 24 Ground transport infrastructure 18 Impacts of tourism / visitor / recreation 15 Industrial areas 14 Mining 14 Crop production 13 Ground water pollution 12 Management systems/ management plan 9 Air pollution 8 Effects arising from use of transportation infrastructure 7 Renewable energy facilities 7 Forestry /wood production 7 Oil and gas 7 Input of excess energy 6 Air transport infrastructure 5 Pollution of marine waters 4 Management activities 3 Temperature change 2 Commercial development 1 Land conversion 1 Water (extraction) 1 Other climate change impacts 1 Invasive/alien terrestrial species 1
* :
The threats indicated are listed in alphabetical order; their order does not constitute a classification according to the importance of their impact on the property.
Furthermore, they are presented irrespective of the type of threat faced by the property, i.e. with specific and proven imminent danger (“ascertained danger”) or with threats which could have deleterious effects on the property’s Outstanding Universal Value (“potential danger”).
** : All mission reports are not always available electronically.