He said five bridges would be constructed on the river to ease transportation.
The bridges would connect Jorhat with Nematighat, Disangmukh with Tekeliphuta, Louit with Khablu, Numaligarh with Gohpur and North Guwahati with Guwahati, the union minister said at the flagging-off ceremony in Majuli Island in Assam.
"Another roll-on, roll-off (ro-ro)' ferry service to transfer passengers and vehicles in large numbers will start here soon," Nitin Gadkari said.
Stating that modern and well-equipped river ports would be established along the banks of the river, the minister said transportation of cargo on the National Waterway 2 -- from Pandu in Guwahati to Dhubri along the Assam-Bengal border would reduce logistics cost and save 300-km road travel.
The 891-km stretch of the Brahmaputra river between Sadiya in the easternmost part of upper Assam and Dhubri was declared the National Waterway-2 in 1988.
Sources said the Inland Water Authority of India (IWAI) will charge Rs 318 per tonne of cargo from Pandu to encourage entrepreneurs and logistic operators to shift to inland waterway from road transportation.
Mr Gadkari also laid the foundation stone for a new scheme for protecting Majuli Island from flood and erosion.
The Rs 233.57 crore scheme was framed by the Brahmaputra Board after taking into account the recommendations of a high-level expert committee of the central government.
Members of the committee visit the island at least twice a year to monitor anti-erosion measures, official sources said.
As part of the scheme, riverbank revetment work would be carried out with sand or earth-filled geo bags at 14 locations.
Majuli district, with an area of 1,245 sq km, includes the main Majuli Island, a large number of smaller islands, some of which are inhabited, and the Brahmaputra river up to its south bank touching Jorhat and Sibsagar districts.
Although measures were taken by the Assam government in the past, the problem of erosion and flood remain largely uncontained, Brahmaputra Board sources said.