Raiden-yama Sabo Dam Route

雷電山(1046mピーク)

Posted on Feb 22, 2023
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S
Posted on Feb 22, 2023
0 0
S
12.5km

Distance

4 hours

Time

995m

Ascent

1046m

Highest point

6/10
Difficulty
Snow Icon | Hokkaido Wilds
Jan-Apr

Best season

TOPO
Raiden-yama 雷電山 (1211m) at the far western end of the Niseko Range is a sprawling massif with a number of appealing winter routes to the summit. This Sabo Dam route 砂防ダムコース approaches from the south-southwest, ascending a wide ridge with well-spaced old-growth forest. There's no tricky creek crossings on this route, and it offers the same expansive views across the entire Niseko Range, and south towards Shimamaki. Here, we describe a route to the 1046m peak. From there, skiers can brave the final icy ridge to the summit, or explore the myriad options for lapping and good downhill skiing.

We visited this route on Mar 31, 2022

Last updated Feb 28, 2024

Topomap

Route Map

Need to know details

Location

Raiden-yama is the last major peak of the Niseko Range, before reaching the Japan Sea coast, in southwestern Hokkaido. This route follows the snowed-in gravel access road towards Lake Kokkuri コックリ湖, before heading north-northwest up one of the main ridges on the southern side of the main Raiden-yama peak.

General notes

There are many ways to skin the cat that is Raiden-yama. Here are some of them:

This route adds to those options, as a pleasant and relatively straightforward way to access the greater southern bowl and gullies area. There are guides who do the occasional snowmobile-access backcountry trip up here, so there is certainly plenty of great terrain to enjoy.

The name of this route – Sabo Dam – means ‘erosion-stop dam’. There are a lot of small concrete erosion-stop dams on the river next to the Kokkuri-ko Lake access road.

Hut
None
Route details

Start from the Lake Kokkuri-ko access road entrance, and skin along the road for 2.5km. After that, head towards the north-northeast through some relatively non-descript old-growth forest. The climb begins very mellow at first before adding steepness at around 400m. That said, overall the climb is quite mellow, with kick turns only occasionally needed. Generally, if you’re ascending, this southern face of the Raiden-yama foothills will eventually funnel you up to the 1046m point. For notes on the final approach to the Raiden-yama summit, check out the Osannai-gawa Route post, which also goes via the 1046m peak.

For the descent from the 1046m point, returning the way you came is the simplest option, keeping towards the skier’s right – it’s easy to get sucked into heading skier’s left, which can make the return to the trailhead a bit complicated – there are a lot of undulating spurs and small gullies where it wouldn’t be impossible to get rather lost without the aid of a GPS. There’s also a lot of very good skiing terrain that drops down towards the Osannai Gully to skier’s left from the 1046m point. Skiing into the gully will require climbing back out again to gain the ridge.

Route Timing
Up | 3hrs
Down | 1hrs

A simple up-and-back trip will likely take fit parties around 4 hours return – perhaps slightly longer if doing this route in deep winter.

Transport

Public transport:

There is no public transport to this route.

By car:

There’s no dedicated parking for this route. Skiers will typically park on the side of the road near the entrance to the Kokkuri-ko lake access road (location), clearing some extra room to the side of the road so as to not block traffic. This is technically illegal, however, so we recommend getting a drop-off by a non-skiing member of your party.

Physical maps
Print: HokkaidoWilds.org 1:25,000 TOPOMAP+
Niseko Backcountry map: Buy on Amazon.co.jp | See companion site for more purchase options
Official Topo Map: Raidenyama (雷電山) – map no. NK-54-20-11-2

NOTE: The official 1/25000 topo map(s) above can be purchased for 350yen from Kinokuniya bookstore next to Sapporo Station or online (in Japanese).

Aspect
The main aspect skiers are exposed to on the descent and/or ascent is South. Therefore, keep an eye on the weather forecast a few days ahead of your trip to monitor wind, snow, and temperature. Also, since this route is in the general vicinity of the Shiribeshi area, consider looking at the Japan Avalanche Network avalanche bulletins (updated Tuesdays, Thursdays, Saturdays at 8am) or the daily Niseko Avalanche Information website. These may give extra insight into avalanche conditions in the greater area around the route.

Snow and
route safety

This up-and-back route along the ridge has very low exposure to avalanche hazards, but skiing off the ridge to the skier’s left will get you into some steeper, more committing terrain that requires good snowpack stability. Also note that on the descent along the ridge, it’s easy to be pulled to the skier’s left into fairly confusing undulating terrain lower down. Keep an eye on the GPS and err on keeping skier’s right. Beyond the treeline will be very exposed to the strong winds off the Japan Sea. Also, keep an eye (and ear) out for snowmobiles on the Kokkuri-ko Lake access road. They won’t be expecting to see skiers on the road.

Raiden-yama Sabo Dam Route Difficulty Rating

Category

Grade

Points

Strenuousness

Vertical Gain

A

40

Time ascending

C

3

Technicality

Altitude

B

6

Hazards

D

0

Navigation

B

12

Totals

61/100

GRADES range from A (very difficult) to D (easy).  More details here. Rating rubric adapted from Hokkaido Yukiyama Guidebook 北海道雪山ガイド.

Weather forecast

Windy.com weather forecast for Raiden-yama 1046m Peak
Onsen nearby

If you’re headed back towards the direction of Niseko, our natural choice of onsen is the down-to-earth and local Yusenkaku Onsen 幽泉閣温泉 (location, 500yen) next to Kombu JR Train station. They’ve got a decent selection of indoor baths, an outdoor bathing area, and a nice relaxation area. They often sell local vegetables in the foyer area, as well as other local crafts, foods, and of course the famous Rankoshi rice.

Extra Resources
No extra English resources that we know of. If you know of any, please let us know in the comments.

Guide Options

If you’d like to ski this route and/or explore other Niseko areas together with a local certified guide, get in touch with Yasuko Kikuchi. Born and raised in Hokkaido, she’s a JMGA-certified guide now based in Sapporo. Her outdoor experience is broad and worldwide, having worked as a Canadian Ski Patrol member, and has sumitted a number of 6,000m+ peaks around the world. She speaks good English. In addition to Yasuko, also see a full list of English-speaking Hokkaido Mountain Guides Association (HMGA) guides on the HMGA website here

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Show Full Route Notes Close Route Notes

Route Trip Notes

It was the last day of March. It had been a warm couple of days, with clear blue skies and below-freezing nights. This did not bode well for this walk up the southern side of Raiden-yama. I was fully expecting to have bulletproof conditions, but the weather looked stellar for the day, and this was one of the few Niseko Range routes I was still to tick off the list for the season.

As I set off from the trailhead at just after 5:30am, it was indeed very solid underfoot. At least this would mean easy skinning. And If I was lucky, perhaps the surface conditions would soften up just enough on the descent for some decent downhill.

This was a quick solo trip, so I took most of the photos using the drone. With the DJI Mini 2 being so small, I could just put it in my trouser pocket – setting it up therefore was quick.

As expected, the ascent was fairly quick and straight forward. Great old-growth forest from relatively low down. The ridge just as the treeline was incredible, with amazing views south along the Japan Sea coast to Shimamaki and Kariba-yama.

Because I’d left so early in the morning, it was only about 9am when I started the descent. This meant that surface conditions for most of it were very solid. But the surface was consistent, and the views couldn’t be beat. An amazing way to start the day – I was done by 10am.

Comments | Queries | Reports

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Raiden-yama Sabo Dam Route Difficulty Rating

Category

Grade

Points

Strenuousness

Vertical Gain

A

40

Time ascending

C

3

Technicality

Altitude

B

6

Hazards

D

0

Navigation

B

12

Totals

61/100

GRADES range from A (very difficult) to D (easy). Hazards include exposure to avalanche and fall risk. More details here. Rating rubric adapted from Hokkaido Yukiyama Guidebook 北海道雪山ガイド.