Excellent place to know about the History about the Arakawa River and changes done to the route of the river over the course of history. It was known that major diversions had been done in 1924 (100 years ago). This place explains the history of the river, present condition, infrastructure. Such a valuable place. It's a bit of challenging for a foreigner as all information posters are in Japanese. Still you can get lots of info about the river. If you use Google translate by camera images you may be able to translate some of the images and get a English version. A satellite picture of the Arakawa basin was painted in the floor of the ground floor which was also attractive and easy to understand.

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Aincent industrial production Red water gate is Grarte for Japanese people

A museum for the actual environment and history of Arakawa river. You can see the biosphere of its basin, fishes, insects and birds. The history of Arakawa river is a fight with the tremendous flood, its name Ara is after it. People struggles to build a safety and stable life with the river side and achieve how to control the water and cooperates with the environment even though some part of the basin is artificial. The high light of visiting is outside. You can feel the river walking on the bank of Arakawa, feeling wind and watching the cherry blossoms along with the walkway.

This museum is highly recommended to understand how Tokyo wouldn't be what it is today without the development if this river from 1910-1030 The iwabuchi gate finished in 1924 will celebrate a 100 years of age sometime next year

No visitors seem to be inside but there is still need for registration over internet 3 days before visit :-(