Season: April and May are generally the best months for the Grass, but Oct and Nov also offer windows of boatable flows following three or four days of good rain.
Flows: The USGS gauge on the Oswegatchie in Harrisville provides an "approximation". The benchmarks below have many variables, so make sure you assess each drop yourself. I
Below 600cfs - You will scrape in numerous areas especially in the lower section, some drops may not be runnable. However, the holes will be tame.
Above 2000cfs- The holes start to get sticker, portaging may be necessary for some drops.
If Harrisville guage is dropping add 150 cfs to the flows above.
|WEST BRANCH OSWEGATCHIE RIVER NEAR HARRISVILLE NY|
|usgs-04262500||600 - 3000 cfs||IV+||01h48m||200 cfs (too low)|
Reports give the public a chance to report on river conditions throughout the country as well as log the history of a river.