This gate faced the mouth of the Tamsui River, so its defense mattered, and it was also the main way for people of Dadaocheng to enter and leave the city. On its north side stood a square outer enclosure, a barbican, whose arched opening deliberately did not line up with the gate's own passage. It carried a plaque with four characters meaning roughly the lock and key of a rugged frontier. When the Japanese authorities pulled the enclosure down, that plaque was left to drift away. The rest of the wall met the same fate. Its foundations were turned into three-lane tree-lined boulevards, called the Three Line Roads. This gate ended up at the junction of the northern road, today's Zhongxiao West Road, and the western one, today's Zhonghua Road, standing on a round traffic island. Nearby, the Japanese built the Railway Department building, finished in 1919, and the Taipei Post Office, finished in 1930. A railway station named Beimen, meaning North Gate, served the Tamsui line from 1915 to 1923. Then in 1978 an overpass was opened right beside the gate and hid it from view for decades. After an urban renewal push in 2015, the overpass was taken down in 2016, and an open plaza was laid out around the gate. In June 2024, the city government began restoration work on it. Before that, the gate had twice been close to demolition, and public campaigning saved it each time.