Dams are among the most repeated questions in Geography — a dam is named and you give its river or state, or a superlative is asked: highest, longest, largest reservoir. About twenty dams cover everything examiners use, and each carries one signature fact that returns year after year. This post gives the dam-river-state table, the superlatives, the reservoir names that exams love, and 15 real questions from past papers.
Key Points (Quick Revision)
- Tehri (Uttarakhand) — India's highest dam, on the Bhagirathi
- Hirakud (Odisha) — one of the longest dams in the world, on the Mahanadi
- Bhakra (Himachal Pradesh) — on the Sutlej; its reservoir is Gobind Sagar
- Indira Sagar (MP) — largest reservoir by capacity, on the Narmada
- Nehru called dams the "temples of modern India"
1. The dam-river-state table
This table answers most questions on its own — learn it as a unit.
| Dam | River | State |
|---|---|---|
| Bhakra | Sutlej | Himachal Pradesh |
| Nangal | Sutlej | Punjab |
| Tehri | Bhagirathi | Uttarakhand |
| Hirakud | Mahanadi | Odisha |
| Sardar Sarovar | Narmada | Gujarat |
| Indira Sagar | Narmada | Madhya Pradesh |
| Omkareshwar | Narmada | Madhya Pradesh |
| Gandhi Sagar | Chambal | Madhya Pradesh |
| Rana Pratap Sagar | Chambal | Rajasthan |
| Nagarjuna Sagar | Krishna | Telangana / Andhra Pradesh |
| Srisailam | Krishna | Andhra Pradesh / Telangana |
| Almatti | Krishna | Karnataka |
| Tungabhadra | Tungabhadra | Karnataka |
| Krishnaraja Sagar (KRS) | Kaveri | Karnataka |
| Mettur | Kaveri | Tamil Nadu |
| Idukki | Periyar | Kerala |
| Rihand | Rihand | Uttar Pradesh |
| Ukai | Tapi | Gujarat |
| Maithon | Barakar | Jharkhand |
| Farakka Barrage | Ganga | West Bengal |
Note the rivers with multiple dams, because options exploit them. Narmada carries Sardar Sarovar, Indira Sagar and Omkareshwar; Krishna carries Nagarjuna Sagar, Srisailam and Almatti; Chambal carries Gandhi Sagar and Rana Pratap Sagar; and Kaveri carries KRS and Mettur. When a dam is named, the river answers itself — the state is where candidates slip.
📌 Exam Focus
- Asked most often: Tehri highest, Hirakud longest, Bhakra-Sutlej, Hirakud-Mahanadi, Idukki-Periyar
- Common trap: Bhakra is in Himachal Pradesh, Nangal in Punjab — same river, different states
- Remember reservoirs: Bhakra = Gobind Sagar · Rihand = Govind Ballabh Pant Sagar · Mettur = Stanley Reservoir
2. Superlatives and reservoir names
| Fact | Answer |
|---|---|
| Highest dam in India | Tehri (Bhagirathi, Uttarakhand) |
| Among the longest dams in the world | Hirakud (Mahanadi, Odisha) — about 26 km with dykes |
| Largest reservoir by capacity | Indira Sagar (Narmada, MP) |
| Reservoir of Bhakra dam | Gobind Sagar |
| Reservoir of Rihand dam | Govind Ballabh Pant Sagar — among the largest man-made lakes |
| Reservoir of Mettur dam | Stanley Reservoir |
| Reservoir of Nangal side / Sutlej system | Part of the Bhakra-Nangal project |
| Arch dam of India | Idukki (Periyar, Kerala) |
| Masonry dam associated with a famous garden | Krishnaraja Sagar — Brindavan Gardens, Karnataka |
| "Temples of modern India" | Nehru's phrase for dams; associated with Bhakra-Nangal |
The reservoir questions are the trap layer of this topic: the dam is famous but the reservoir name is asked. Gobind Sagar behind Bhakra, Govind Ballabh Pant Sagar behind Rihand and Stanley Reservoir behind Mettur are the three that repeat. Idukki carries the arch dam tag — a curved concrete dam across the Periyar gorge — and KRS carries the Brindavan Gardens association.
3. Multipurpose projects — the first-generation names
| Project | River | Shared by |
|---|---|---|
| Bhakra-Nangal | Sutlej | Punjab, Haryana, Rajasthan (HP hosts the dam) |
| Damodar Valley Corporation (DVC) | Damodar | Jharkhand, West Bengal — modelled on America's TVA |
| Hirakud | Mahanadi | Odisha |
| Tungabhadra | Tungabhadra | Karnataka, Andhra Pradesh |
| Chambal project | Chambal | Madhya Pradesh, Rajasthan |
| Nagarjuna Sagar | Krishna | Telangana, Andhra Pradesh |
The DVC fact is the one to hold: it was India's first multipurpose river valley project (1948), modelled on the Tennessee Valley Authority of the United States — both halves of that sentence get asked. Maithon, Panchet and Tilaiya are its dams on the Barakar-Damodar system.
4. How it is asked in exams — 15 PYQs
- Which is the highest dam in India? — Tehri Dam (SSC CGL 2023)
- The Hirakud Dam is built on which river? — Mahanadi (SSC CHSL 2023)
- The Bhakra Dam is built on which river? — Sutlej (SSC MTS 2023)
- The reservoir of the Bhakra Dam is called? — Gobind Sagar (RRB NTPC 2024)
- The Tehri Dam is built on which river? — Bhagirathi (SSC CGL 2022)
- The Sardar Sarovar Dam is in which state? — Gujarat (SSC GD 2024)
- The Idukki Dam is built on which river? — Periyar (SSC CHSL 2024)
- Nagarjuna Sagar Dam is built on which river? — Krishna (SSC CPO 2023)
- The Mettur Dam's reservoir is called? — Stanley Reservoir (RRB Group D 2024)
- Who called dams the temples of modern India? — Jawaharlal Nehru (SSC MTS 2024)
- The DVC was modelled on which foreign project? — Tennessee Valley Authority (USA) (SSC CGL 2024)
- Gandhi Sagar Dam is built on which river? — Chambal (RRB NTPC 2025)
- Brindavan Gardens is associated with which dam? — Krishnaraja Sagar (KRS) (SSC GD 2023)
- The Farakka Barrage is built on which river? — Ganga (SSC CHSL 2022)
- Which dam has India's largest reservoir by capacity? — Indira Sagar (RRB Group D 2023)
5. Quick Revision
⚡ Pairs to fix in memory
- Superlatives: Tehri highest · Hirakud longest · Indira Sagar largest reservoir
- Sutlej: Bhakra (HP) + Nangal (Punjab) · reservoir Gobind Sagar
- Narmada: Sardar Sarovar (GJ) · Indira Sagar + Omkareshwar (MP)
- Krishna: Nagarjuna Sagar · Srisailam · Almatti · Kaveri: KRS (Brindavan) + Mettur (Stanley)
- Chambal: Gandhi Sagar (MP) + Rana Pratap Sagar (RJ)
- Reservoirs: Bhakra = Gobind Sagar · Rihand = G B Pant Sagar · Mettur = Stanley
- DVC 1948 — first multipurpose project, TVA model · Idukki — arch dam (Periyar)
Frequently Asked Questions
Which is the highest and which is the longest dam in India?
The Tehri Dam in Uttarakhand, on the Bhagirathi, is India's highest. The Hirakud Dam on the Mahanadi in Odisha is the longest — with its dykes it stretches about 26 kilometres, placing it among the longest dams in the world. The two superlatives are asked together, so keep the rivers attached: Tehri-Bhagirathi, Hirakud-Mahanadi.
Why do Bhakra and Nangal appear as separate answers?
They are two dams of one project on the Sutlej. The main Bhakra Dam stands in Himachal Pradesh, with the Gobind Sagar reservoir behind it, while the smaller Nangal Dam lies downstream in Punjab. When a question asks the state of the Bhakra Dam, the answer is Himachal Pradesh — Punjab is the trap option.
What is special about the Idukki Dam?
It is India's famous arch dam — a curved concrete structure built across the Periyar gorge in Kerala between two hills. Arch dams transfer the water's force into the rock walls of the gorge, which is why the design suits that site. When a question says arch dam, the answer is Idukki.
What was India's first multipurpose river valley project?
The Damodar Valley Corporation, set up in 1948 on the Damodar river across Jharkhand and West Bengal, modelled on the Tennessee Valley Authority of the United States. Its dams include Maithon, Panchet and Tilaiya on the Damodar-Barakar system. Both the year and the TVA model are asked.
How many questions come from dams in exams?
Usually one per paper in SSC and Railway exams — a dam-river match, a dam-state match, or a superlative. About twenty dams plus the three reservoir names cover nearly everything, and since dams do not move, the topic never needs re-learning.
For more Geography topics in simple language, see our Rivers of India post and the Geography section. Preparing for a specific exam? Start with the RRB Technician guide or join the 100 Hour GS Course.