In India, the Dhola Sadia Bridge, also known as Bhupen Hazarika Setu, has been built over which tributary of the Brahmaputra River?

Introduction / Context:
This question links Indian geography with important transport infrastructure in the north eastern region. The Dhola Sadia Bridge, officially named Bhupen Hazarika Setu, is a major road bridge that improves connectivity between Assam and Arunachal Pradesh. It has often been mentioned in news reports as one of the longest river bridges in India. The bridge crosses a tributary of the Brahmaputra River system, and remembering the correct tributary helps candidates strengthen their understanding of both river geography and strategically important projects in the country.

Given Data / Assumptions:

• The bridge in question is Dhola Sadia Bridge or Bhupen Hazarika Setu.
• It is associated with the Brahmaputra River system in north eastern India.
• Options list four rivers: Kameng, Lohit, Subansiri and Manas.
• All four are known tributaries of the Brahmaputra, but only one hosts this bridge.

Concept / Approach:
The main idea is to connect the specific bridge with the correct tributary. Dhola Sadia Bridge links Dhola in Assam to Sadia in Tinsukia district and crosses the Lohit, an important eastern tributary of the Brahmaputra. Some learners may confuse it with other tributaries in Assam and Arunachal Pradesh, so it is useful to associate the bridge name directly with the Lohit in memory. A systematic approach involves recalling that Kameng, Subansiri and Manas are significant rivers in the region, but the nationally highlighted road bridge was built over the Lohit arm of the Brahmaputra.

Step-by-Step Solution:
Step 1: Identify the project as Dhola Sadia Bridge or Bhupen Hazarika Setu in Assam and Arunachal Pradesh. Step 2: Recall that this bridge was inaugurated to improve connectivity to Arunachal Pradesh across a wide channel of the Brahmaputra system. Step 3: Remember that news reports describe it as built over the Lohit, which is a major eastern tributary. Step 4: Compare each option and note that only Lohit River matches this description. Step 5: Conclude that the correct answer is Lohit River.

Verification / Alternative check:
A useful verification technique is to recall other associations of the remaining rivers. Kameng is often linked with western Arunachal regions near Tawang, Subansiri flows near Arunachal and Assam border areas associated with dam projects, and Manas is linked with Manas National Park and wildlife conservation. None of these are repeatedly connected with the Dhola Sadia Bridge in standard current affairs sources. In contrast, Lohit and Dhola Sadia Bridge appear together frequently, confirming that Lohit River is correct.

Why Other Options Are Wrong:
Kameng River is a tributary of Brahmaputra but is not the channel over which the Dhola Sadia Bridge was constructed. Subansiri River is another important tributary known for hydroelectric projects but not for hosting this particular long bridge. Manas River is associated more with Manas National Park and flows through a different part of Assam, not the Dhola Sadia stretch.

Common Pitfalls:
Candidates often mix up the north eastern tributaries of the Brahmaputra because there are many with overlapping regions. A common error is picking Subansiri due to its frequent mention in dam debates. Others may choose Manas because of its link with a well known national park. To avoid such confusion, aspirants should create simple memory links such as Dhola Sadia Bridge equals Lohit River, and revise a concise map of the Brahmaputra and its main tributaries before exams.

Final Answer:
Dhola Sadia Bridge or Bhupen Hazarika Setu has been built over the Lohit River, a major tributary of the Brahmaputra.