The Okutadami Jukai Line is a scenic mountain road that connects Uonuma City in Niigata Prefecture to Hinoemata Village in Fukushima Prefecture. It is part of National Route 352 and stretches for about 60 km. The route offers spectacular views of Okutadami Lake, untouched beech forests, and rugged mountainous landscapes, creating a true sense of remote adventure.
Often called “Japan’s most extreme national road,” it is narrow and winding, but the journey rewards you with breathtaking nature and a strong sense of accomplishment.
Recommended Section
Okutadami Dam → Miike (御池)
This section takes you along the lakeshore of Okutadami and into deep mountain valleys. It’s especially beautiful during the fresh green season in early summer and the colorful autumn foliage.
Road Conditions & Safety
- Fully paved, but extremely narrow in many places (difficult for two vehicles to pass)
- Many blind corners and tight curves — drive with caution
- Watch out for wet pavement, fallen leaves, and moss
- Poor or no cell phone reception in most areas
- Closed in winter (early November to mid-June)
Points of Interest
- Okutadami Dam: A massive concrete dam with sightseeing boat cruises available
- Ginzandaira Onsen: A quiet hot spring area perfect for post-ride relaxation
- Miike Rest Area: Located at the mountain pass and popular as a trailhead for hikers
Local Food
- Meals with Uonuma-grown Koshihikari rice
- Mountain vegetable dishes and grilled river fish like char (iwana)
- Regional soba noodles and wild mushroom soups are also popular
Fees & Access
- Toll-free
- Closest ICs: Koide IC (Niigata side, via Kan-Etsu Expressway), Aizu-Wakamatsu IC (Fukushima side, via Tohoku Expressway)
- About 1 hour from Koide IC to Okutadami Dam by car
Best Season & Weather
- Best from late June to mid-October
- June–July: Bright green scenery and cool temperatures
- October: Famed for vibrant autumn leaves, especially around the lake
- Even in summer, higher elevations can be chilly — bring warm layers
Touring Plan Example
One-Day Trip (from Niigata side)
Koide IC → Okutadami Dam → Ginzandaira → Jukai Line → Miike → Continue toward Aizu (6–7 hours)
Overnight Trip
Stay at Ginzandaira Onsen and continue touring toward Oze or Southern Aizu the next day