|March 2012 (35.713 Degrees, 139.848 Degrees) Hirai Bridge
It looks like someone is planting a garden along the river. Perhaps residents are allowed to lease the land for gardens? More likely it's a flower garden planted by the City.
Tokyo, Japan's Bridges: Hirai Ohashi across the Arakawa by Mark Yashinsky is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 United States License.