The proposed four-laning project will upgrade a key section of NH-15 between Baihata Chariali near Guwahati and Tezpur, strengthening road connectivity across Assam.
Project Overview:
The National Highways & Infrastructure Development Corporation Limited (NHIDCL) is implementing the four-laning of the Baihata Chariali to Tezpur section of NH-15 in Assam. The project covers approximately 135.87 Km and carries an estimated construction cost of 7,642.20 INR-Crore. NHIDCL has proposed the development under the BOT Toll mode, with construction planned from 2026 to 2029.
The project involves upgrading the existing highway corridor to a four-lane highway, including new and upgraded road infrastructure along the route. The construction scope covers earthwork, granular sub-base and base works, shoulders, bituminous pavement, and rigid pavement components. It also includes the construction or improvement of culverts, minor bridges, pedestrian and cattle underpasses, pedestrian overpasses, grade-separated structures, and approaches to major structures.
Furthermore, the development will incorporate supporting highway infrastructure such as service and slip roads, toll plazas, roadside drains, road signage and markings. It also includes crash barriers, bus bays, truck lay-bys, rest areas, roadside plantation, slope protection, toe and retaining walls, and utility infrastructure.
Recent Updates:
As of August 2026, the tender is floated for the selection of the private developer.
Project details:
| Name of the Project | NHIDCL Four Laning of Baihata Chariali to Tezpur Section of NH-15 |
| Latest Status | Pre-Construction Contractor – Tendering Status update : As of August 2026, the tender has been floated for selection of a private developer. |
| Location | Assam |
| Road Length | 136.881 Km |
| Construction Cost (INR-Crore) | 7,642 |
| Description | The proposed project involves the Construction of : Four-lane highway from Baihata Chariali (Chainage 0+000), near Guwahati, to Tezpur (Chainage 150+971) along NH-15, excluding the Mangaldoi Bypass section from Chainage 28+500 to 42+590. |
| Sector | Roads & Highways |
| Construction start (Tentative) | 2026 |
| Project completion (Estimated timeline) | 2029 |
ABOUT
Established by the Government of India, the National Highways & Infrastructure Development Corporation Limited (NHIDCL) is responsible for developing, maintaining and managing national highways and strategic road infrastructure, particularly across the Northeast and other challenging regions of the country. The corporation undertakes highway development through various project delivery models, including BOT and other public-private partnership frameworks.
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Disclaimer: The information in this article is gathered using data from Biltrax Construction Data’s proprietary platform. This article uses feature images that may not represent the project. However, they are merely for illustration purposes.
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