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". If Harrisville guage is dropping add 150 cfs to the flows above.
Below 600cfs - You will scrape in numerous areas, however is still runnable.
The upper runnable level is not a definite as the river will have larger wave trains as the level increases. But caution should be taken as flipping may result in a longer swim.
|WEST BRANCH OSWEGATCHIE RIVER NEAR HARRISVILLE NY|
|usgs-04262500||400 - 4000 cfs||I-II||01h47m||~ 284 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.