| SNo | Activities/Component | As on Date |
| 1 | Original conceptualization of project by the then Madras Presidency | 01-07-41 |
| 2 | First survey (by Diwan Bahadur Venkata Krishna Iyer) | 01-09-42 |
| 3 | Preliminary investigation was taken up and the project was named as Ramapada Sagar (FRL was proposed at 170 ft) | 01-10-42 |
| 4 | Another survey was conducted and height was proposed at 208 ft | 1944 |
| 5 | A detailed investigation was done and it was proposed to keep height at 198 ft in the first phase and 208 ft in the second and final phase | 1946-47 |
| 6 | Experts committee lead by then chief engineer N. Govindaraya Aiyangar decided to go for the two-phase project | 1947 |
| 7 | Sir SV Rama Murthy proposed a Ramapadasagar scheme with 130 m dam height and a 1,500 MW of power generation capacity, but it was not pursued due to geological reasons. | 1951 |
| 8 | A technical committee headed by AC Mitra recommended a barrage at Polavaram to irrigate uplands | 1965 |
| 9 | Godavari Water Disputes Tribunal was formed | 01-04-69 |
| 10 | Andhra Pradesh government named the project Polavaram and made a case before the tribunal for river control work at Polavaram | 1969 |
| 11 | Andhra Pradesh presented a project report for Polavaram barrage with a145-ft-high dam and two canals | 1970 |
| 12 | Andhra Pradesh submitted another project report to the CWC for construction of a 150-ft-high earth-cum-rock-filled dam. | 1978 |
| 13 | Inter-state agreements with Karnataka, Maharashtra, Madhya Pradesh and Orissa with a dam height of 150 ft | 04-08-1978, 11-07-1979, 02-04-1980 |
| 14 | Agreements placed before the Godavari Water Dispute Tribunal and finalized | 03-04-80 |
| 15 | Detailed project report of Polavaram Project completed | 1985 |
| 16 | Project report submitted to the CWC | 1987 |
| 17 | R&R reports prepared by CESS | 1996 |
| 18 | EIA-EMP prepared by Environment Protection Training & Research Institute based on data of 1996 | 2002 |
| 19 | The execution of the Project started during the year 2004. | 2004 |
| 20 | EIA-EMP updated by AFC Ltd. Hyderabad during 2005 submitted to MoEF | 16-09-05 |
| 21 | Application submitted to MoEF for site clearance | 23-03-05 |
| 22 | MoEF-constituted expert committee visited the project site | 4-5 Sept 2005 |
| 23 | APPCB notified for public hearing held on 10 Oct 2005 | 10-09-05 |
| 24 | Application for site clearance filed | 16-09-05 |
| 25 | EIA submitted to MoEF | 16-09-05 |
| 26 | Chief Engineer, Indira Sagar Project sought clearance from Member Secretary, Orissa Pollution Control Board. | 16-09-05 |
| 27 | MoEF asks clarifications on EIA | 17-09-05 |
| 28 | MoEF gives site clearance | 19-09-05 |
| 29 | Chief Engineer, Indira Sagar Project writes to District Collector, Malkangiri, Orisssa seeking rehabilitation details | 29-09-05 |
| 30 | Public hearing is held at five places in East Godavari, W. Godavari, Khammam, Visakhapatnam and Krishna districts | 10-10-05 |
| 31 | Andhra Pradesh Pollution Control Board grants consent letter to establish the project | 18-10-05 |
| 32 | A presentation given in the expert committee meeting held at MoEF. | 19-10-05 |
| 33 | Replies to the queries posed by the experts submitted to MoEF | 20-10-05 |
| 34 | MoEF clearance | 25 Oct, 2005 |
| 35 | Application for forest clearance | 12-12-05 |
| 36 | Andhra Pradesh High Court hears a batch of writ petitions filed by some political parties, environmentalists, social activists and legal experts opposing the project and the judgment reserved | February-March, 2006 |
| 37 | Central Empowered Committee (CEC) of the Supreme Court advises Andhra Pradesh government to stop work on the project when it hears objections raised by tribal rights activists and environmentalists | 27-04-06 |
| 38 | Andhra Pradesh government stops the project works | 30-04-06 |
| 39 | Central Wildlife board clearance | 10-07-06 |
| 40 | The CEC of SC tours Andhra Pradesh and visits the project site | 29-31 July 2006. |
| 41 | The Project was accorded clearance by Technical Advisory Committee of MOWR during the year 2009 for an estimated cost of Rs. 10,154.04 Cr. at 2005-06 price level. | 2009 |
| 42 | Investment clearance by Planning Commission was accorded during the year 2009. | 2009 |
| 43 | The Project was included under AIBP during 2009 for the balance cost of Rs. 8427.87 Cr. at 25:75 (Central: State) sharing. | 2009 |
| 44 | Cost of the Project was revised to Rs. 16010.45 Cr at 2010-11 price level and the same was accepted by the Technical Advisory Committee in its 108th meeting held on 04.01.2011. | 04.01.2011 |
| 45 | TAC of CWC accorded techno-economic clearance for the revised estimated cost of project for Rs. 16,010.45 crore. | 4 January, 2011. |
| 46 | Central Team with Supreme Court nominated expert( Sh. M. Gopala krishnan) and members of CWC was formed on 11.4.2011for inspecting the dam to check whether construction is being carried out as per award of GWDT | 11.4.2011 |
| 47 | Project has been declared as National Project during 2014 by an Act of Parliament (Andhra Pradesh Reorganization Act, 2014). | 2014 |
| 48 | Polavaram Project Authority (PPA) has been formed as Special Purpose Vehicle (SPV) during 2014 for execution of the project. | 2014 |
| 49 | Indira Sagar project granted national status in Andhra Pradesh Re-organisation Act introduced in Parliament in February 2014 by the Congress-led UPA government at the Centre as a condition for bifurcation of the state. | 01-03-2014 |
| 50 | The Andhra Pradesh State Re-organization Act, 2014 declared the project as a national project | 01-03-2014 |
| 51 | The office of the Polavaram Project Authority started functioning in January 2015. | Jan-15 |
| 52 | The ordinance, promulgated envisages transfer of seven mandals (talukas) to the residual Andhra Pradesh state for the smooth completion of the Indira Sagar Polavaram irrigation project. | 28-05-15 |
| 53 | The NCST, GoI visited the project and displaced villages. | 26 -28 March 2018 |
| 54 | Indira Sagar Project entered into Guinness Book of World Records when 32,100 cubic meters of concrete was poured in 24 hours. | 07-01-19 |
| 55 | The 2nd Revised Cost Estimate has been examined in CWC and was placed before Advisory Committee of MoWR, RD &GR in its 141st meeting held on 11.02.2019. The same has been accepted by the Advisory Committee for an amount of Rs.55,548.87 Cr at PL 2017-18 | 11.02.2019 |
| 56 | Revised Cost Committee (RCC) was constituted vide MoWR, RD & GR O.M. No. P.101/1/1/2016/Polavaram/SPR-I/318-27 dt. 2.4.19 to examine the cost escalation of Polavaram Irrigation Project (PIP).The RCC has recommended Rs.47725.74 Cr at PL 2017-18. | 02.04.2019 |
| 57 | Spillway (April-2021,as per earlier schedule) | May, 2021 |
| 58 | Erection of Radial Gates (Nov-2021,as per earlier schedule) | April, 2021 |
| 59 | Coffer Dams (Jan-2021,as per earlier schedule) | June, 2021 |
| 60 | Upper coffer dam works completed. | January, 2022 |
| 61 | Earth Cum Rock-Fill Dam-Gap-II (Oct-2021,as per earlier schedule) | April, 2022 |
| 62 | Left Main Canal (July-2021,as per earlier schedule) | April, 2022 |
| 63 | Right Main Canal (June-2021,as per earlier schedule) | April, 2022 |
| 64 | All the 48 barrage gates are fully erected | 30th-June, 2022 |
| 65 | Lower coffer dam works completed | 17th-Feb-2023 |
| 66 | Completion of inspection and field investigation of damaged diaphragm wall during the 2020 Godavari floods and the decision was given to rectify the damage that took place. | March, 2023 |
| 67 | The Experts from U.S.A. and Canada visit Polavaram project site to assess the damage to the project and suggest remedial measures | 30-June-2024 |
| 68 | The Union government approved the release of ₹12,157 crore for the project. | 28-August-2024 |
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