1989:  As a response to the public out cry (initiated by Institute for Scientific and Technological Research), the State Forest Department proposed 414 hectares (out of total 4,000 hectares) of Deepar Beel as a Wildlife Sanctuary (preliminary gazette notification) under Wildlife Protection Act of 1972.

1995: The Revenue Department had allotted a plot of six bighas to the Tourism Development Corporation for construction of a tourist lodge despite the resolution of the high-level committee on wetland conservation.

1997: Deepar Beel Management Authority was formed by the State Government to oversee the conservation and development of Deepar Beel. It remains effectively non-functional till date.

2002: Declared Ramsar site in 2002.

2004: Bird life International included Deepar among the five select wetlands from Assam-Syhlet region as an Important Bird Area with an outstanding grade.
2006: A petition was filed by the Unnayan Samiti secretary Biplabananda Choudhary against construction on the lake bed by the state government as a part of Tourism development.

2006: The Guwahati High Court issued a stay order on September 21 on the building project.

2006: Guwahati Municipal Corporation (GMC) started to dump waste in Paschim Boragaon closer to the water body.

2006: A study conducted by the Institute of Advanced Study in Science and Technology under the Union department of science and technology found that water percolating through solid wastes has polluted the nearby water bodies, which are connected to Deepar Beel. The institute had cautioned that contamination of Deepar Beel would harm the biodiversity of the lake. The study highlighted the fact that the dumping ground is situated close to human habitation, which could create health hazard for the residents as the area would become a breeding ground of cockroaches and mosquitoes and other pests, which can transmit diseases like malaria, yellow fever, dengue and encephalitis.

2006: Deepar beel finalized the venue for the 33rd National rowing competitions. 

2006: Assam Science, Technology, and Environment Council started a massive desilting and digging project at Deepar with an objective of increasing water storage and deterring further encroachment into the wetland.

2006: The dredging activity by the Assam Science Technology and Environment Council got mired in legal and financial problems.

2007: Campaign launched to save Deepar beel, the lone Ramsar Site of the State by the authorities. The participants included the faculty members, research scholars, students, officers, employees and workers of the Guwahati University, concerned citizens of the city and the students and teachers of the Gopinath Bordoloi Nagar Academy.

2007: The residents near the dumpsite files a PIL. 

2007: A three-member committee was formed by the High Court. GMC was directed to spray pesticides in the neighboring area of the lake to prevent health hazards.

2008: Pollution control had given the state government issued a warning for outbreak of epidemic in the area.

2008: The Guwahati Water bodies (Preservation and Conservation) Bill, 2008 passed. The objective is to preserve the wetland, minimize the problem of water logging in the city and create an eco-friendly atmosphere. With this Bill at its command, the Government of Assam is planning to re-acquire land in the periphery of Deepar Beel, to undertake development projects, including water sports at the beel, and for this purpose a budgetary allocation of about US $3 million (Rs.12 crores) has been approved.

2009: Despite prohibition by the government and its various steps for eco-tourism development, illegal earth cutting is continuing at Deepar Beel. The conscious people in the locality feared that unless such illegal activities are stopped, the very existence of the beel will collapse. They therefore urged the authority concerned to halt such activities soon.