In this paper, we show the measurement results of the engine sounds of small boats that cruise in a canal. It was measured from October to November in 2011. The canal that is called an Toyosu canal is in the residential area in Tokyo in Japan. It is a canal with the role of the waterway traffic in Tokyo. There were a lot of tugboats in daytime, were a lot of fishing boats day and night, and there were a lot of houseboats at night. Many of engine sounds were sound exposure level around Lae=80dB. The level of the the greatest was more than sound exposure level Lae=90dB. The most a lot of boats were passing in the morning and the evening. They passed in the early morning when the background noise was 50dB. They passed while obstructing the conversation or waking up. It was a sound with the influence for the inhabitant by the canal.