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Difficulty II(III) at this flow (II-III normally)
Length 4.25 Miles
Flow Range 200 - 1000 CFS
Flow Rate as of: 1 hour ago 8.77 [CFS] ℹ️
Reach Info Last Updated 01/18/2019 10:45 pm

River Description

The Green River is a classic low gradient, low volume, class II-III river that runs off the Berkshires, including Mt. Greylock. It contains 3 definable class IIIs, all short, and lots of old mill drops. There are a few strainers here or there, so keep watch. It is mostly very chill, fast-moving, class I-II, interspersed with some short drops. 

The most commonly used put-in is at the bridge for Hopper Rd, at "Hopper Dropper" the first class III (II+ at low flows). There is a parking lot on river right after you cross the bridge off 43. You can put in higher up, at various locations in Mt. Hope Park, but parking is trickier, and there are no substantial rapids. If you put in at the parking lot on Hopper Rd., gear up and then walk across the road along the path on river right (walking upstream). Put in anywhere here. 

From the Hopper Dropper the river is primarily class I until the river takes a hard left and there is a tall smokestack. This is Old Mill (class III, which appears as a substantial horizon line). This is an old mill, so be careful and scout from river left. The general line is river center working river right. Be respectful of the condominium owners here. 

Immediately after the Old Mill is the 3rd class III, Accelerator, and perhaps the most fun. A short bedrock slide, that ends in a flushy hole. Run river left to center. At lower flows, you'll feel the bumps on the hull of your boat. Below this rapid is a fun surfing hole, that becomes moderately retentive at flows greater than 350 cfs. 

The rest of the river from here until the the Route 2 bridge is class II, with another mill drop or two. Be careful of rebar here or there. After the route 2 bridge (run river right) one can take out in the long public park that parallels river left for a ways. I would recommend scouting a good location for this prior to running. Otherwise, continue down to the confluence with the Hoosic (one logjam in this section) and take out on river left along Cole Fields. Plenty of parking down there, but it makes the shuttle a fair bit longer. 

At levels below 250 cfs it's a bit of a scrapefest, but can still be fun, it's been run it down to 180. Anything greater than 250cfs is good fun, and it's mostly a float anyways. At 600 cfs it can be a bit pushy, but is still class II/III. Be cautious of strainers at higher levels, as there is a spot or two where you are ducking riverwide trees. 

If you are looking for a little play after your run of the Green, there's a beautiful playwave on the Hoosic, under half an hour away by car. If the Green is in, the Hoosic wave will definitely have enough water. 



Rapid Descriptions

Hopper Dropper

Class - III Mile - 0
Rapid Thumbnail Missing

The first rapid of the run, it can be scouted from the Hopper Bridge. Put in just upstream of the bridge on river right. At low flows, down the center is the only available line. At higher flows, a few options open up, including a boof on river right into the middle flow. There is an undercut rock at the bottom, and a recovery pool. At low flows it's an easy class II+, at higher flows, a class II+/III-. 

Old Mill

Class - III Mile - 2.5
Rapid Thumbnail Missing

This rapid presents as a sizable horizon line, and drops ~10 ft over its short entirety. Catch eddies on river left as the river turns sharply to the left, and you can see a tall brick smokestack. Get out and scout, there's a walking path for the condo owners. The general line is river center working river right. There is a hole on far right that at higher levels could become problematic. 


Class - III Mile - 2.6
Rapid Thumbnail Missing

This is the third and final class III. Just below Old Mill, the river turns hard right and lines up for this fun rapid. Scout on the rocks on river left. Be respectful, as you are in the backyard of various shops on Water St. in Williamstown. Run left/left of center working center into a fun, splashy hole. This rapid can be run again and again, walk up on river left.  

Dough Boy

Class - II Mile - 2.7
Rapid Thumbnail Missing

This is the playspot directly below Accelerator - a fun, river wide, playspot with eddy-service. At levels about 350 cfs, it becomes a bit-retentive, but I've always been able to get out whilst upside down. 


Gage Descriptions

The gauge is downstream of most of the run, but it's so short that it provides a good estimate of conditions most of the time. 

Directions Description

We have no additional detail on this route. Use the map below to calculate how to arrive to the main town from your zipcode.

No Accident Reports



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Jim Michaud


Alex Barham


Jackson Ennis


Matt Muir


Revision #Revision DateAuthorComment
1190482 04/19/01 Jim Michaud n/a
1209809 06/12/18 Alex Barham updated rapid name
1210859 01/18/19 Jackson Ennis updated description with put-in details
1209180 04/08/18 Jackson Ennis changed rapid description
1209181 04/08/18 Jackson Ennis
1209196 04/10/18 Jackson Ennis changed flows and updated info
1209183 04/09/18 Jackson Ennis fixed flow correlation
1209218 04/15/18 Jackson Ennis fixed directions
1198533 11/01/10 Matt Muir Gauge and flow correlation