The storage ratio of Tsugaru Shirakami Lake was 12.7% as of 8:30 on August 8, and the Aomori River National Highway Office and the Iwakigawa Dam Integrated Management Office announced that they had moved to a warning system.

The artificial lake "Tsugaru Shirakami Lake" created by the completion of the Tsugaru Dam in 2017 (Heisei 29) is located in the upstream part of the Iwaki River, and is used for flood control and hydroelectric power generation as well as irrigation water supply and Tsugaru Plain It was created for the purpose of drought control.

According to the office, the amount of rainfall in the Tsugaru Dam basin from May to July is about 40% lower than the average for the past five years, and the reservoir level at 12:00 on the 9th is 177.49 meters. The lowest water level since April 2017, when full-scale operation started.

From 8:30 on the 8th, the amount of water taken by the Tsugaru Dam was reduced by 20% from about 17,000 liters per second to about 14000 liters per second. As a result, the minimum required amount of irrigation water was adjusted so that it could be replenished until around August 20.

It was announced that the amphibious bus operating in the lake will be suspended from 9th to 20th due to the drop in water level. The person in charge of the "Tsugaru Shirakami Tour" that he is planning says, "There is currently no forecast of rain, and depending on the amount of rainfall in the future, suspension may be prolonged."