The physicochemical investigation of water quality of the streams in the area where dams are to be constructed has been carried out from 5th to 7th, August 1977. The data for the streams of "Golji" and "Imgye" in Imgye Myeon, Jeongson Gun, "Jeoncheon" in Bugpyeong Eup, Samcheok Gun are obtained as follows. 1. The pH was 7.70-7.75 for "Jeoncheon" whereas 8.25-8.40 for "Golji" suggesting the value is relatively higher than others. 2. The concentration of Ca^(++), Mg^(++) and SO₄^(--), and the alkalinity are high in "Golji" and the concentration of Na^+, C1^- and SiO₂, are high in "Jeoncheon". 3. In all area investigated, Ca^(++) is positively correlated to Mg^(++), total hardness, alkalinity and pH but negatively correlated to SiO₂. 4. The total hardess of "Golji" is 91-119.8㎎/ℓ which is the highest and that of "Jeoncheon", 17.5-36.9㎎/ℓ is indistinguishable to the value obtained from the north Han river basins. 5, The NO₂-N and NH₄-N are scarcely detected in all area investigated, indicating pollution in the streams, and the amount of NO₃-N 0.2-4.43㎎/ℓ, detected in the area are similar to the value of the other natural stream, suggesting that the nitrogen is originated from earth. 6. Based upon above results, the water quality of the streams investigated is found to fit for aerobic aquatic living things, with high DO and little artificial pollution.