Ammonoosuc (Upper) -

Ammonoosuc (Upper), 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
usgs-01130000 2200 - 4000 cfs II 6d22h23m 449 cfs (too low)

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: 2018-05-02 14:57:07


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.

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