The aim of this paper is to present the influence of hydrotechnical structures on morphological changes in the Jamne stream channel in the Gorce Mountain. The channel of the Jamne stream was still intact in the early 70’s. Before regulation, it was characterized by the occurrence of the large quantity of gravel bars. The width of the active channel was up to 20 m. The bottoms of channels in longitudinal profile were approximately equal, and in cross sections it was possible to distinguish a few currents separated with gravel bars, constantly filled up with water. At present, channel of stream is single-threaded, in lower sections sinuous, and its width does not exceed 8 m. Only at the outlet of side valleys the width of channel is growing up to 10 m. The banks of stream are regulated, shaped and strengthened with hydrotechnical structures. For example in the catchment of the Jamne on section from 700 to 3640 m the length of the stream became shortened for 180 m. The longitudinal profile of stream is stair due to wooden steps and concrete drop structures located next to rock thresholds in different intervals from each other. Its occurrence is more frequent in the outlet parts of the stream. An asymmetry of bank is still noticeable in its most parts. However, it occurs along with the significant decrease in the size of the surface areas of accumulated gravel bars and the length of erosion cuttings of the river banks, which is a result of the river regulation. The paper also addresses the regulatory compliance initiatives of the stream with the Water Framework Directive. Attention also given to the problem of illegal gravel mining from the channels of mountain streams and its effect on the degradation of the channels. The thesis of this article is to demonstrate a type of irregularity technical regulation, which directly influenced the change in stream channel morphological processes

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