Gauge Description:

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.

If Harrisville guage is dropping add 150 cfs to the flows above.

Anything below 1800 will be a bit shallow in areas with some rock dogging and scrapping during the lower sections where the river widens, but will still be able to paddle.

Gauge Information

Name Range Difficulty Updated Level
WEST BRANCH OSWEGATCHIE RIVER NEAR HARRISVILLE NY
usgs-04262500 1100 - 6000 cfs II-III(V+) 01h27m 39.5 cfs (too low)
The USGS gauge on the Oswegatchie in Harrisville provides an "approximation". The benchmarks below have many variables, so proper assessment is necessary
gauge graph
RangeWater LevelDifficultyComment
1100 -3000 cfs barely runnable-perfect runnable II-III(V+) gauge is important or has warning This range of flows is based on a recommendation from Squires' book. The upper limit of the range is a rough guess.
3000 -6000 cfs perfect runnable-high runnable II-III(V+) gauge is important or has warning This range of flows is based on a recommendation from Squires' book. The upper limit of the range is a rough guess.

Reports give the public a chance to report on river conditions throughout the country as well as log the history of a river.

When River/Gauge Subject Level Reporter
[AL] 41743.jpeg n/a Dan McDonnell
7y134d19h44m @Grass, N. Branch Clare Road to Downerville [NY] Downerville Take Out n/a Gregory R. Miller
7y134d20h02m @Grass, N. Branch Clare Road to Downerville [NY] Looking up from CCM 1900 cfs Gregory R. Miller
7y134d20h03m @Grass, N. Branch Clare Road to Downerville [NY] CCM 1900 cfs Gregory R. Miller
7y134d20h10m @Grass, N. Branch Clare Road to Downerville [NY] Harper's Falls 1900 cfs Gregory R. Miller
7y134d20h19m @Grass, N. Branch Clare Road to Downerville [NY] Harper's Falls 1900 cfs Gregory R. Miller