Stream flow is a principal element of the hydrological cycle and its temporal variability is important from both the scientific and practical point of view. In the present study the monthly stream flow trends of 3 gauging stations viz. Kedar, Naula and Sarpdully in Ramganga river catchment were detected using the Mann–Kendall (MK) non parametric test and Sen’s slope estimator. For the trend detection of Kedar and Naula gauging stations stream flow data for the period 1973-2012 was used and for Sarpdully the

data for the period 1986-2012 was used. Trend estimation with Mann-Kendall non parametric test at 5% level of significance and Sen’s slope magnitude were determined for each months. The trend result for Kedar gauging station was found to be negative from January to July and December whereas positive trend was observed during August to November. At Naula gauging station a negative trend was noted in all months whereas at Sarpdully station there was positive trend in all months. Sen’s slope estimator indicated increasing and decreasing magnitude of slope during different months.