It's a good location to get off at Hatonosu Station on the Ome Line. There is a free parking lot nearby. There is a waterfall, a water god, a suspension bridge, and the water is beautiful. There are cafes near the entrance to the valley and on the way overlooking the valley, so it's a very nice place. I went there because the autumn leaves information on the internet said it was the best time to see them, but it seems it was still too early. The maples, which will soon turn red, are still mostly green. The tips of the leaves are slightly red? That's about it. It takes about an hour to get to just before Shiromaru Dam and turn back. It's a compact walk, and many people go beyond the dam, towards Lake Okutama. It's quite a steep slope, and the footing is not good, with cobblestones and rocks. It was a bit disappointing to see the accommodation that had closed down and was in ruins.