Upper Ammonoosuc - Upper

Upper Ammonoosuc, New Hampshire, US



Usual Difficulty II (for normal flows)
Length 6 Miles
Avg. Gradient 30 fpm
Max Gradient 45 fpm

Corrine in Gorge-Us

Corrine in Gorge-Us
Photo by Mark L. taken 05/29/11 @ 2500 cfs

Gauge Information

Name Range Difficulty Updated Level
Upper Ammonoosuc-Upper
river-10531 2200 - 4000 cfs II cfs

River Description

The Upper Ammo needs a lot water for a fluid run.  Therefore you would be hard pressed to find this river running unless everything else in the neighborhood is at or near flood stage.  The river itself is an easy class I-II at the begining and eventually builds up to a steady class II with a few small ledge drops.  Gorge-us is the most difficult section in this run.  It is recognized by a sharp right bend up against a shear granite wall on river left approximately 4.8 miles below the put-in.  Gorge-us should be considered a class II+ or III depending on level.  It is easily portaged on river right.

Be aware that most of this run is wild and a difficult bush wack back to civilization, it makes for a great northern New England wilderness experience but a nightmare if problems arise.

StreamTeam Status: Not Verified
Last Updated: 2011-07-16 11:05:19


Rapid Summary

Mile Rapid Name Class Features (Legend)

Rapid Descriptions

Gorge-Us (Class III, Mile 4.8)

Rich Channey at Gorge-Us

Rich Channey at Gorge-Us
Photo by Mark L. taken 05/29/11 @ 2500 cfs

4.8 miles from the put in you will come across a few more difficult and tightly spaced ledge drops of about 1 to 2 feet.  When you see the river take a sharp right up against the granite wall on river left take on on river right to scout and/or portage.  The rapid itself is only 30 yards long but drops steeply with three or more large hole / waves in the center flow.  You can sneak the right side but look out for shallow rocks that could push you back into the main flow.  The tail end of the rapid produces some nice symetrical surfing waves with a good access eddy on both sides.

User Comments

Users can submit comments.
September 5 2011 (2391 days ago)
Mark LacroixDetails
On August 28th, 2011 Hurricane Irene struck New England. The resulting floods caused extensive
damage throughout the region, the worst in over 100 years. More than half the rivers in Vermont and
northern New Hampshire recorded their highest flow levels ever. Many roads, guardrails, power
lines, bridges, trees and other debris now litter several rivers throughout the region. River beds
have been scoured and changed course, many new strainers make navigation problematic at best and
downright dangerous at worse. Please realize that the river description you see here may not match
current situation after the floods. Use common sense and when in doubt scout especially on blind
drops. Also, if you run this river in the next year or so please comment on its navigability, even
if there are no problems this will be very helpful. Please report any new strainers or changes to
the rapids that will impact future boating. Thank you,

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