South Cooper Creek runs stream order 4 (mid-range in the network, on a scale that runs from 1 for a headwater trickle up to 6 or more for a full river) and stretches roughly 11 km before it joins
Cooper Creek, which then drains into the
duncan river. Channel-geometry data puts the median width at about 7.2 m (narrow), the gradient at about 6.18% (moderately steep), and the peak mean-annual discharge at about 1.314 m³/s (low flow): a small backcountry creek, not fishable river water. A 2013 Kootenay Lake bull trout monitoring appendix lists a historic redd count of 17 on South Cooper Creek under the wider Cooper Creek system, spawning-survey evidence from the past rather than a current population estimate.