Nagdhunga tunnel

Nagdhunga tunnel (नागढुंगा सुरुङ्ग) is a under-construction highway tunnel connecting Sisnekhola of Dhading district and Nagdhunga in Kathmandu. The tunnel will be a part of Tribhuvan Highway. The tunnel has a height of 8.3m and have a lane of 9.5m wide. The length of the tunnel is 2688 m.

Geology
The tunnel passes through bedrocks of Sopyang formation. There are six shear zones in the alignment.

Nagdhunga Tunnel Construction Project
The contractor of the project is Hazama Ando Corporation. The project was scheduled to be finished by April 2023. The cost estimate of the project is about NPR 22 billion.

Features

 * Tunnel,  2.688 km, 2 lanes, total tunnel (carriageways) width 9.5 m, grade 3.5%
 * Approach road, 2.60 km, 2 lanes, carriageway width 7m, 2 m shoulder
 * Bridge, 3
 * Flyover, 1 at Balambu interchange
 * Toll facility, west side 3 booths, 3 lanes each and east side 2 booths, 2 lanes each
 * Tunnel management office, west side area 390 m2 and east side 300 m2
 * Disposal area development at the east portal;
 * Transmission line 4.14 km.