Nera (Danube) basin and it is not navigable. After the filling of the artificial Lake Đerdap, as a result of the Iron Gate I Hydroelectric Power Station which was finished in 1972, the mouth of the river into the Danube was flooded. In order to allow the optimal electricity production, the water level of the Nera at the mouth should not go below , while it must not exceed it if the flooding of the banks is to be avoided. Since the mid-1990s, there are significant problems in fixing the river's level, as the process is costly and complicated. In 2018, representatives
Ust-Nera Ust-Nera Ust-Nera (; ) is an urban locality (an urban-type settlement) and the administrative center of Oymyakonsky District in the Sakha Republic, Russia, located in one of the coldest permanently inhabited regions on Earth, approximately northeast of Yakutsk, the capital of the republic. As of the 2010 Census, its population was 6,463. Ust-Nera is located at the confluence of the Nera and Indigirka Rivers, from which it takes its name (the "ust-" part means "river mouth" in Russian). Ust-Nera is located about north of the "selo" of Oymyakon, which one of two places in the Sakha Republic (the other being