Decree 21 October1955 (Ministry of Agriculture), declaring Aigüestortes and Estany de Sant Maurici a national park (Spanish Official Gazette 25, 21-11-55)
Law 7/1988 of 30 March reclassifying the National Park of Aigüestortes and Estany de Sant Maurici (OJGC 978, 15-04-88)
Law 22/1990 of 28 December partially modifying the boundaries of the peripheral protection area of the National Park of Aigüestortes and Estany de Sant Maurici (OJGC 1392, 11-01-91)
Order of 17 December 1993, on the access of public service vehicles carrying up to 9 passengers, landowners and residents in the municipalities of Espot and Barruera, to the National Park of Aigüestortes and Estany de Sant Maurici. (OJGC 1845, 12.1.94)
Decree 234/1996, of 5 July 1996, extending the National Park of Aigüestortes and Estany de Sant Maurici (OJGC 2228, 10-07-96)
Order of 20 October 1997, approving the plan for closure of forest tracks in the National Park of Aigüestortes and Estany de Sant Maurici and the peripheral protection area. (OJGC 2515, 11-11-97)
Law 41/1997, of 5 November (modifying Law 4/1989, of 27 March on the conservation of natural areas and wild flora and fauna ), includes Aigüestortes and Estany de Sant Maurici in the national park network (Spanish Official Gazette 266, 06-11-97)
Order PTO/46/2002, of 19 February, regulating certain aspects of the introduction of a discretionary public transport service vehicles carrying up to nine passengers in the National Park of Aigüestortes and Estany de Sant Maurici. (OJGC 3587, 4-3-2002).
Decree 39/2003, of 4 February, approving the second Master Plan of Use and Management of the National Park of Aigüestortes and Estany de Sant Maurici (OJGC 3825, 19-2-2003)
International protection:
Special Protection Area, September 1987, in accordance with Directive 79/409 EEC, on the conservation of wild birds
Extension of the Special Protection Area for Birds, December 2002
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