State of Conservation
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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(37) Housing(36) Water infrastructure(25) Storms(22) Invasive / alien freshwater species(22) 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.
