i
ii
iii
iv
v
vi
vii
viii
ix
x

State of Conservation

146
Reports
25
Properties concerned
20
States Parties with SOC reports
Date Start: 1999close
Threats* : Surface water pollutionclose
States Parties: United States of America
Year: 2004
Document Source: WHC-04/28.COM/15B.Add
Threats*: Surface water pollution
Other Threats: Brucella infection threat to bison population
States Parties: United States of America
Year: 2001
Document Source: WHC-01/CONF.208/09,WHC-01/CONF.208/9,WHC-2001/CONF.205/4
Threats*: Surface water pollution
Other Threats: Infection threat to bison population
Danger List:  Yes
States Parties: United States of America
Year: 2000
Document Source: WHC-2000/CONF.202/4,WHC-2000/CONF.204/9
Threats*: Surface water pollution
Other Threats: Infection threat to bison population
Danger List:  Yes
States Parties: United States of America
Year: 1999
Document Source: WHC-99/CONF.209/13
Threats*: Surface water pollution
Other Threats: Infection threat to bison population
Danger List:  Yes
States Parties: China
Year: 2021
Initialy proposed for examination in 2020
Document Source: WHC/21/44.COM/7B
Threats*: Surface water pollution
States Parties: China
Year: 2018
Document Source: WHC/18/42.COM/7B
Threats*: Surface water pollution

* : 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.