The waterfall is technically a river cascade, as it processes the primary outflow of Lake Towada.
It is nicknamed 'The Fish Ladder' in local folklore due to its function as a natural barrier to aquatic migration.
The roar of the falls is audible from the main road path even before the waterfall comes into full view.
It is the final major waterfall encountered when traveling upstream from the lower valley toward Lake Towada.
Choshi Falls is the widest and most prominent waterfall within the Oirase Mountain Stream area, spanning 20 meters in width and reaching a height of 7 meters. It is situated near the outlet of Lake Towada, where the Oirase River begins its flow. Unlike many other waterfalls in the region that originate from smaller tributaries, Choshi Falls is fed by the main volume of the river, resulting in a consistent and powerful water flow. The waterfall acts as a natural barrier that historically prevented fish from swimming upstream from the Oirase River into Lake Towada. The surrounding Oirase stream path is a protected area within the Towada-Hachimantai National Park. The waterfall remains visible year-round, though the surrounding forest character changes drastically between the verdant greens of summer and the fiery colors of autumn.
The small wooden observation deck located directly adjacent to the waterfall provides the clearest vantage point.
Park at the designated areas near Nenokuchi if arriving by vehicle, as parking directly at the falls is extremely limited.
Wear footwear with solid grip, as the proximity to the waterfall creates constant moisture on surrounding rocks and walking paths.
Use a polarizing filter on your camera to reduce glare from the water spray and wet foliage.
Attempting to climb the rocks near the waterfall base, which are consistently slippery and hazardous.
Access to the Oirase Stream road may be restricted or closed during heavy winter snowfall; check local road conditions if visiting between December and April.
Stay on the designated wooden boardwalks to protect the forest floor and ensure safety.
