The Reiganshima Water Level Observation Station, completed in 1994 in Chuo Ward, Tokyo, stands as a distinctive environmental conservation facility along the Arakawa River. Designed collaboratively by Architect Five, the Riverfront Development Center, and the Ministry of Construction's Arakawa Downstream Construction Office, this structure exemplifies the integration of functional infrastructure with thoughtful architectural design. Positioned strategically at Shinkawa, the station monitors water levels while contributing to the urban waterfront environment. Its design reflects the 1990s approach to balancing ecological preservation with contemporary architectural expression in riverside development.