The USGS gauge on the Oswegatchie in Harrisville provides an "approximation". The benchmarks below have many variables, so make sure you assess each drop yours
This is the next drop after No Thanks pool, this rapid also varies greatly as does the flows. At low levels this is a small hole but at high flows it become sticky with large boils and water pushing into the wall. Scouting can be either left or along the rock pennisula. A sneak line is available along the far right at high levels.