Bali Pass Trek

Bali Pass is a high crossing, not a valley walk. From Sankri you climb the Supin and Ruinsara drainages past Devsu Bugyal to Ruinsara Tal at about 3,600 m, then keep going up through Odari to a high camp somewhere between 4,560 m and 4,700 m, well above anything on the neighbouring Har Ki Dun trek. Crossing day starts in the dark, usually around 4 am, on snow or hard neve, and tops out at roughly 4,940 m (16,207 ft) on a narrow saddle with the Bandarpunch and Kalanag wall on one side and the Yamunotri valley falling away on the other. The descent is the serious half: a short exposed ridge section where operators report placing fixed rope, then 1,500 to 1,900 m of continuous loss over scree, snow and rock down to the Dhamni camps, and out past the Yamunotri temple to Janki Chatti. It is a point-to-point route, so there is no turning back once you commit past the high camp. This trek is for people who have already slept above 4,000 m, who are comfortable walking in crampons on a slope, and who accept a real evacuation problem. It is not a first Himalayan trek under any framing.

• Devsu Bugyal, a broad meadow early on the Sankri side that most Har Ki Dun trekkers never turn off to see.
• Ruinsara Tal at around 3,600 m, a glacial lake under Kala Nag with Bandarpoonch behind it — a destination trek in its own right, passed here on the way to the pass.
• Odari and the high camp at 4,560-4,700 m, above everything green, with the pass visible as a notch in the skyline.
• The pass itself at 4,940 m: a snow saddle reached up steep neve, with an exposed ridge section on fixed rope.
• The view from the saddle in both directions at once — the Supin side you climbed from, and the Yamunotri valley you are about to drop 1,500-1,900 m into.
• Kala Nag (Black Peak) and Swargarohini close enough on pass day to pick out individual ridgelines.
• Yamunotri temple and Janki Chatti at the far end — you finish at one of the Char Dham shrines rather than back where you started.

Insist on a rest or acclimatisation day at Ruinsara Tal, or a walk-high-sleep-low day between Ruinsara and Odari; it is the single most effective change to this itinerary. Drink 3 to 4 litres a day, eat even without appetite, no alcohol, no sleeping tablets at any point. The operator should be measuring oxygen saturation and pulse twice daily from Devsu onwards and recording it, and should be prepared to turn an individual back at the high camp on those numbers plus symptoms. Non-negotiable equipment on a trek at this altitude: bottled oxygen with a working regulator and mask at the high camp, a portable altitude chamber (Gamow or PAC bag) or a documented reason why not, dexamethasone and nifedipine in the hands of a trained guide, and a written evacuation plan for both sides of the pass. The rule remains that descent is the treatment. The complication specific to Bali Pass is that from the high camp, descent means going back down two days of trail, or over a 4,940 m pass and down the far side; a sick person on the Yamunotri side after the crossing is easier to evacuate than one at the high camp before it, which is exactly the judgement the guide has to make at 3 am.

• The operator grades this Easy - Moderate; independent sources support Difficult. We list the sourced grade — see the sources below.
• Train for 10 to 12 weeks. Targets: 5 km running in under 30 minutes or 10 km in under 60 minutes, three times a week; a weekly long hill session of 3 to 4 hours with 800 to 1,000 m of ascent carrying 10 kg; two strength sessions a week emphasising step-downs, lunges and calf work for the descent. Separately from fitness, there is an experience prerequisite that independent sources are near-unanimous about: prior trekking experience with at least one night slept above 4,000 m, and ideally prior comfort walking in crampons on a slope. Himalayan Hikers ask for completed moderate-to-difficult treks and high-altitude experience above 4,000 m; Himalaya Trekkers ask for prior Himalayan high-altitude experience around 4,500 m; Himalayan High, euttaranchal, Meraki Triangle and Boots and Crampons all state that this is not a first-timer's trek.
• Concretely: a whiteout or storm catching the group on or just past the pass, with 1,900 m of unfamiliar descent below and no shelter; a slip on the exposed ridge section or on hard morning neve without crampons or a rope, where the fall is not survivable; high-altitude pulmonary or cerebral oedema at the 4,600 m high camp, where the nearest help is two days away in either direction and evacuation is a carry; a late start that puts the group on soft afternoon snow on the descent, in wet-slide conditions; and hypothermia at the high camp with an under-rated sleeping bag, which is the most common preventable cold injury on this route. Anyone who has never slept above 4,000 m and who reaches that high camp for the first time on this trek is the person most likely to be at the centre of any of these.

Nearest railhead: Dehradun (DDN). Approximately 190 to 210 km to Sankri at the start, 8 to 11 hours by road; the trek ends at Janki Chatti, roughly 180 to 200 km from Dehradun, 8 to 10 hours by road via Barkot. Nearest airport: Jolly Grant, Dehradun (DED), approximately 210 to 230 km from Sankri and about 170 to 190 km from Janki Chatti. Basecamp: Sankri (start). The trek finishes at Janki Chatti, the road head for Yamunotri, so it is a point-to-point route and your transport has to reposition.

• 3 to 4 x quick-dry full-sleeve trekking t-shirts
• 2 x thermal base layer sets, merino or synthetic, mid to heavy weight (200 to 260 gsm), one always kept dry for the high camp
• 2 x quick-dry trekking trousers plus 1 x insulated or softshell trouser for the high camp and pass day
• 2 x fleece or synthetic mid layers, roughly 200 and 300 weight
• 1 x down jacket rated to about -20 C for the high camp; 650 fill or better, with a hood. A -10 C jacket that is adequate on Har Ki Dun is not adequate at 4,600 m in October
• 1 x hardshell jacket, fully waterproof and windproof, with a helmet-compatible hood and taped seams
• 1 x hardshell overtrousers with full or three-quarter side zips so they go on over boots and crampons
• 1 x insulated balaclava or a beanie plus a face-covering buff; a sun cap for the lower days
• 3 x buff or neck gaiter
• 3 layers of hand protection: thin liner gloves, an insulated glove, and a waterproof over-mitt for pass day. Losing a glove at 4,900 m is a frostbite event
• 6 to 7 pairs of wool or wool-blend socks, including 2 heavy pairs, plus 1 pair reserved only for sleeping
• 1 x thermal leggings for sleeping
• 1 x waterproof, insulated, high-ankle trekking boots with a stiff sole that will take microspikes or strap-on crampons without flexing them off. A soft-soled boot is the usual reason someone cannot use crampons on the pass
• Confirm crampon compatibility with your actual boots before the trek, not at the high camp
• 1 x full-length waterproof gaiters, not ankle gaiters
• 1 x closed-toe camp shoes
• Spare laces
• 60 to 70 litre backpack with a proper hip belt and a rain cover if self-carrying; 30 litre summit pack for pass day
• Sleeping bag with a comfort rating of -15 to -20 C for the high camp, plus a fleece or silk liner. Confirm the comfort rating of any operator-supplied bag in writing; a bag rated -10 C at extreme is not a -10 C bag
• Insulated sleeping mat with an R-value of 4 or better, or a foam mat under an inflatable one. At 4,600 m the ground takes more heat out of you than the air does
• Crampons or heavy-duty microspikes, an ice axe, a climbing helmet, and a harness with a carabiner and sling for the fixed-rope section. Establish in writing which of these the operator supplies, which you must bring, and who is qualified to fix and manage the rope
• 2 x trekking poles with snow baskets
• Headlamp with at least 200 lumens plus 2 spare battery sets, because pass day starts around 04:00 in the dark on snow
• 2 x 1 litre insulated bottles. Hydration bladders freeze solid on pass day and are the wrong choice here
• Water purification tablets or a filter for the lower valleys; above Odari water is snowmelt
• UV400 wraparound glacier-suitable sunglasses, category 4, plus a spare pair. Snow blindness on a pass crossing is an emergency because it makes you a stretcher case
• Power bank of 20,000 mAh, kept inside your sleeping bag at night
• Dry bags for the sleeping bag and the dry base layer set
• Personal whistle and a small emergency bivvy or foil blanket
• Toilet paper, sealable bags for waste, and a rubbish bag. There is no infrastructure above Ruinsara
• Original government photo ID plus 2 photocopies for the Sankri forest check post
• 2 to 4 passport photographs
• Foreign nationals: passport and valid Indian visa plus copies, and a higher park fee
• Medical fitness certificate. On a pass trek this should be recent and should follow an actual examination, not a signature
• Signed indemnity or self-declaration as required by the operator
• Insurance policy that explicitly covers trekking above 5,000 m and helicopter evacuation, with the policy number and 24-hour emergency line carried on paper
• Written emergency contacts, and a copy left with someone at home along with your itinerary and the operator's number
• Blister and foot care kit: zinc oxide tape, hydrocolloid dressings, antiseptic, a needle
• Paracetamol; ibuprofen or diclofenac with food
• Diamox (acetazolamide) for altitude, and dexamethasone and nifedipine are the emergency drugs for cerebral and pulmonary oedema. All three are prescription decisions for a doctor who knows your history, and the emergency drugs should be in the hands of someone trained to use them, not carried as a talisman. Do not take Diamox for the first time on the trail; trial it at home
• Ondansetron or similar anti-emetic, loperamide, oral rehydration salts
• Personal prescription medication in original packaging, double quantity, split between two bags
• SPF 50+ sunscreen and SPF lip balm, reapplied through the day. UV at 4,900 m on snow burns skin inside an hour
• Antiseptic cream, crepe bandage, and a knee support if you have any history of knee pain, because the pass-day descent is 1,500 to 1,900 m in one push
• Personal hygiene items and sealable bags to carry waste out