National Highway 505 (India)

National Highway 505, commonly called NH 505, is a national highway in India. It is a spur road of National Highway 5. NH 505 traverses the state of Himachal Pradesh in India. NH 505 is a high elevation road, covering the Kinnaur and Lahaul and Spiti districts of Himachal Pradesh, mainly running along the Spiti River in the Spiti Valley. The highway from Kaza to Gramphu remains closed for 6–9 months in a year due to heavy snowfall and the closure of Kunzum La pass at an elevation of 4550 m.

Overview
National Highway 505 was designated Himachal State Highway 30 prior to its being named on 4 March 2014 as a national highway. The highway runs through the high-elevation cold desert area of Lahaul and Spiti valleys of Himachal, which area receives negligible rainfall. The terrain is barren and treacherous, prone to landslides and disruptions. The road is narrow and rough at places and crosses the high-elevation Kunzum pass, requiring good driving skills in mountains.

NH 505 has been of key importance to the growth of a cash crop economy, mass tourism, and the expansion of telecommunications in Spiti. This highway provides connectivity to some major Buddhist monasteries and various other interesting places.

Route
The route of NH 505 starts at the Khab Sangam in Kinnaur district from National Highway 5. It runs along the Spiti Valley through Kinnaur and enters Lahaul and Spiti district at Sumdo. It continues up the Spiti Valley to Kunzum Pass. It descends and follows the Chandra River to the terminus at Gramphoo.

Kinnaur district
The terminus at Khab, Kinnaur district is the preferred point of entry to the Spiti Valley which is located at an average elevation of 3,350 m. This mostly all-weather access point to Spiti Valley from Khab is at an elevation of about 2,600 m. Travelling from Chandigarh or Shimla to Khab gives a chance for travellers to gradually acclimatize themselves to avoid altitude sickness. NH 505 climbs steeply from Khab Sangam up to Nako (3,662 m). It descends to Chango on the Spiti River, then enters Lahaul and Spiti district at Sumdo.

Lahaul and Spiti district
From Sumdo, NH 505 runs mostly alongside the Spiti river for about 130 km until Losar. After passing through Hurling, the next town is Tabo with the well-known Tabo Monastery and caves. The highway passes through some unusual clay pillars en route to Kaza, the largest town in the Spiti Valley. Near Lingti, 15 km before Kaza, the 33 km road to Pin Valley National Park branches off over the Attargo Bridge to the right bank of the Spiti. On the Tabo side of Lingti is the road to the Dhanker Monastery. In this section, the riverbed is very wide, up to 500 m in places. The river itself is much narrower and meanders in braids along the broad riverbed.

Junctions

 * Kinnaur district
 * Khab
 * 0.0
 * 0.0
 * Southeast terminus
 * Lahaul and Spiti district
 * Attargo Bridge
 * 74.6
 * 120.0
 * Mud village, Pin Valley
 * About 1.8 km NW of Lingti
 * Lahaul and Spiti district
 * Gramphoo
 * 169.6
 * 273.0
 * Northwest terminus
 * 169.6
 * 273.0
 * Northwest terminus
 * Northwest terminus