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, especially at MED and HIGH flows. If Harrisville gauge is rising:

MIN:750-800cfs (3.5') - You will scrape in numerous areas, but have enough for the main drops.
MED: 1100cfs (4.0') - Only slight scraping, but holes are tame.
HIGH: 1700 (4.75') - Ratchet up the difficulty of all rapids at least half a level. Holes are bad!

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

Visual "Gauge": Check the Graffiti on the river right rock just below the bridge in Degrasse. If water is rising and touching the bottom of the "heart", then you can scrape down the wide places and have good water for the drops. If water is dropping then middle of "heart" is the MIN mark.

Gauge Information

Name Range Difficulty Updated Level
usgs-04262500 800 - 2000 cfs IV-V 01h34m 39.5 cfs (too low)

gauge graph
RangeWater LevelDifficultyComment
0 - 800 cfs extremely Low-barely Low IV-V gauge is important or has warning
800 -2000 cfs barely runnable-high runnable IV-V gauge is important or has warning

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
Grasse [ny] Grasse, Twin Falls 900 cfs simon wiles
Lower S. Branch of Grass River [NY] Basford Falls 3 High! Tim Kelley
Lower S. Branch Grass River [NY] Twin Falls n/a Tim Kelley
Grass River [NY] Large Marge (Rainbow Falls) n/a Tim Kelley
Grasse River [NY] Iron Bridge n/a Tim Kelley
6y153d08h22m /Grass, Lower S. Branch-Twin Falls [NY] Grass wood 0 cfs Jim Dobbins
7y134d19h26m /Grass, Lower S. Branch-Twin Falls [NY] Basford Falls 900 cfs Gregory R. Miller
7y134d19h33m /Grass, Lower S. Branch-Twin Falls [NY] Sinclair 750 cfs Gregory R. Miller
7y134d19h37m /Grass, Lower S. Branch-Twin Falls [NY] Twin Falls 1500 cfs Gregory R. Miller
7y135d17h00m /Grass, Lower S. Branch-Twin Falls [NY] Adrenaline Falls 1500 cfs Gregory R. Miller
7y135d17h08m /Grass, Lower S. Branch-Twin Falls [NY] Twin Falls n/a Gregory R. Miller
> 10 years Grass, Lower S. Branch [NY] Twin Falls n/a Glenn Wallace
> 10 years Grass, S. Branch [NY] Grass River n/a Patrick Rogers