The gate was officially designated as a tangible cultural property by the Japanese government for its historical and architectural significance.
The structure marks the original starting point of the Sumida River, where it diverts from the main Arakawa channel.
The transition from the old gate to the new Iwabuchi Watergate occurred in 1982 to improve the city's overall flood resistance.
It is a popular location for observing river engineering history alongside modern Japanese riparian infrastructure.
The Old Iwabuchi Watergate, known locally as Akasuimon, is a historic floodgate located at the confluence of the Arakawa and Sumida rivers in Kita City, Tokyo. Constructed in 1924 following the 1923 Great Kanto Earthquake, it was designed to regulate water levels and protect Tokyo from flooding. The structure is built in a distinctive red-brick Neo-Renaissance architectural style. It served as a critical piece of water management infrastructure until it was decommissioned in 1982. A newer, modern watergate was constructed adjacent to the old one to handle current flood control requirements. Today, the site functions as a preserved landmark and a public park space. The area serves as a junction for the Arakawa and Sumida river cycling and walking paths. The gate's mechanical equipment, including the original sluice gate components, remains visible for public viewing.
From the riverbank path looking toward the front of the gate to capture both the red brick structure and the river backdrop.
Bring a bicycle to connect to the extensive riverside cycling trails that follow the Arakawa river.
Visit during the cherry blossom season to see the rows of trees planted along the nearby riverbanks.
Combine the visit with a walk through the adjacent Akabane Nature Observation Park.
Do not attempt to climb or touch the original mechanical gate components for safety and preservation reasons.
