National Waterways Passing Through Bihar – Routes, Rivers and Importance

National Waterways Passing Through Bihar include Ganga, Gandak, Ghaghara, Punpun and Sone, supporting inland transport, trade and connectivity.

National Waterways Passing Through Bihar

Bihar is one of India’s most important riverine states, with major rivers such as the Ganga, Gandak, Ghaghara, Sone and Punpun flowing through or along its territory. These rivers have historically supported agriculture, settlements, trade and transportation. With the development of inland water transport, several rivers associated with Bihar have also been recognized as National Waterways (NWs) by the Government of India.

The National Waterways Act, 2016 declared 111 inland waterways as National Waterways across India. Among them, several important waterways are connected with Bihar. These include National Waterway-1 (Ganga-Bhagirathi-Hooghly River System), National Waterway-37 (Gandak River), National Waterway-40 (Ghaghara River), National Waterway-81 (Punpun River), and National Waterway-94 (Sone River). The Ministry of Ports, Shipping and Waterways officially lists these waterways and identifies Bihar among the states through which the relevant waterways pass.

1. National Waterway-1 – Ganga-Bhagirathi-Hooghly River System

National Waterway-1 (NW-1) is the most significant national waterway connected with Bihar. It follows the Ganga-Bhagirathi-Hooghly river system between Haldia and Allahabad (Prayagraj). The officially notified length is 1,620 km, and it passes through West Bengal, Jharkhand, Bihar and Uttar Pradesh.

In Bihar, the Ganga forms the central part of the state’s river system and passes by several important cities and river ports. Patna, Bhagalpur and other locations along the river are connected with the wider inland water transport network. IWAI documents identify locations such as Digha Ghat and Danapur in the Patna area as points associated with NW-1.

NW-1 is particularly important for the transportation of bulk commodities. According to the Ministry of Ports, Shipping and Waterways, cargo moved on National Waterways has grown substantially in recent years, and NW-1 is among India’s major waterways for cargo movement. Commodities transported include coal, fly ash, fertilizers, containerized and general cargo, and other materials.

For Bihar, NW-1 provides an opportunity to strengthen connections between river-based transport, road networks and railways. It can also reduce pressure on highways when suitable cargo is shifted from road to waterways.

2. National Waterway-37 – Gandak River

The Gandak River is designated as National Waterway-37 (NW-37). The officially listed waterway has a length of 296 km and passes through Bihar and Uttar Pradesh.

The Gandak is one of the major northern rivers of Bihar. It enters the state from the Himalayan region and eventually joins the Ganga. Because of its geographical connection with the Ganga basin, the Gandak has potential importance for inland navigation and regional transportation.

The development of NW-37 is significant from the perspective of improving water-based connectivity in northern Bihar. Better utilization of the Gandak can support the movement of goods and potentially provide an additional transport option for communities and commercial centers located near the river.

3. National Waterway-40 – Ghaghara River

Another important waterway associated with Bihar is National Waterway-40 (NW-40), which is based on the Ghaghara River. The official list gives it a length of 354 km and identifies Bihar and Uttar Pradesh as the states through which it passes.

The Ghaghara is an important river of the Ganga river system and has a strong geographical and economic connection with northern Bihar. Its recognition as a National Waterway reflects the potential of the river for organized inland navigation.

Development of NW-40 can help improve connectivity in riverine areas, particularly where road and rail infrastructure may not provide the same direct access. Water transport can be especially useful for bulk commodities because vessels can carry large quantities of cargo in a single trip.

4. National Waterway-81 – Punpun River

The Punpun River has been designated as National Waterway-81 (NW-81). According to the official National Waterways list, the Punpun waterway has a listed length of 35 km and lies in Bihar.

The Punpun is a tributary of the Ganga and flows through parts of southern Bihar, including areas around the Patna region. Although its notified length as a National Waterway is considerably shorter than NW-1, its recognition highlights the importance of Bihar’s smaller river systems within the national inland waterway framework.

The future utility of smaller waterways depends on factors such as water depth, seasonal conditions, navigation infrastructure, terminals and cargo demand. Therefore, designation as a National Waterway does not necessarily mean that every stretch has the same level of regular commercial navigation.

5. National Waterway-94 – Sone River

The Sone River is another important Bihar waterway and is designated as National Waterway-94 (NW-94). The official list gives the Sone National Waterway a length of 141 km and identifies Bihar as the state associated with it.

The Sone is one of the major tributaries of the Ganga. It flows through the southern part of Bihar before joining the Ganga near the Patna region. The river has considerable geographical importance because it connects parts of southern Bihar with the wider Ganga river system.

The development of NW-94 can potentially improve water-based connectivity and create additional opportunities for transportation along the Sone basin. Like other inland waterways, its practical navigation potential depends on water availability, river conditions and supporting infrastructure.

Importance of National Waterways for Bihar

National waterways can play an important role in Bihar’s economic and transportation development. Water transport generally has the potential to move large volumes of cargo efficiently over long distances. It can complement road and rail transportation rather than simply replacing them.

For Bihar, the waterways are particularly significant because the state has an extensive network of rivers and tributaries. The Ganga provides a major east-west transportation corridor, while rivers such as the Gandak, Ghaghara, Punpun and Sone connect different parts of the state to the larger river system.

The Ministry of Ports, Shipping and Waterways states that cargo movement on India’s inland waterways increased from 29 million metric tonnes in 2014–15 to 218 million metric tonnes in 2025–26. NW-1 is among the country’s major cargo-carrying waterways.

Inland waterways can also support multimodal transportation. When river terminals are connected effectively with roads and railways, goods can move through different transport modes in an integrated network. This can improve supply chains and create new opportunities for river-based trade.

Challenges in Waterway Development

Despite their potential, Bihar’s waterways face several challenges. River channels can change naturally because of sediment deposition, erosion and shifting currents. Seasonal variation in water levels can also affect navigation.

Other challenges include the need for suitable terminals, navigation aids, cargo-handling facilities, vessel services, connectivity with road and railway networks, and regular maintenance. Smaller rivers may have additional limitations because their navigable conditions can vary considerably during different seasons.

Environmental considerations are also important. Development of inland waterways must balance transportation objectives with the protection of river ecosystems, aquatic biodiversity and local livelihoods.

Quick Facts

• NW-1: Ganga-Bhagirathi-Hooghly River System – 1,620 km
• NW-37: Gandak River – 296 km
• NW-40: Ghaghara River – 354 km
• NW-81: Punpun River – 35 km
• NW-94: Sone River – 141 km
• Major waterway for Bihar: NW-1
• Legal basis: National Waterways Act, 2016
• National Waterways declared under the Act: 111

Summary

Bihar’s National Waterways represent an important part of the state’s geographical and economic potential. NW-1 on the Ganga-Bhagirathi-Hooghly system, NW-37 on the Gandak, NW-40 on the Ghaghara, NW-81 on the Punpun and NW-94 on the Sone are the key National Waterways associated with Bihar in the official national list.

Among these, NW-1 is by far the most prominent because of its length, strategic location and established role in India’s inland water transport network. The other waterways add to Bihar’s broader river-based connectivity and demonstrate the importance of the state’s rivers beyond agriculture and water resources. With appropriate infrastructure, navigation facilities and environmentally responsible development, inland waterways can contribute to Bihar’s transportation, trade and regional economic growth.

Also Check: Bihar GK