A 158 day old warning about this river was added. Click on comments below to read it.

Ammonoosuc - 4. Twin Mountain to Pierce bridge


Ammonoosuc, New Hampshire, US

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4. Twin Mountain to Pierce bridge

Usual Difficulty II-III (for normal flows)
Length 2.9 Miles
Avg. Gradient 41 fpm
Max Gradient 48 fpm

Gauge Information

Name Range Difficulty Updated Level
AMMONOOSUC RIVER AT BETHLEHEM JUNCTION, NH
usgs-01137500 3.10 - 6.00 ft II-III 00h48m 1.6 ft (rc= -0.5 )


River Description

This is a nice intermediate run in the Northern White Mountains of NH. The most difficult rapid (Boat Breaker) is at the end of this run near the take out.

Technical info

Put in elevation........1286'
Take out elevation......1167'
Total drop..............119'
1st mile................46'
2nd mile................30'
2.9 mile................43' (48' average)
Average drop/mile.......41'
Distance................2.9 miles
River width average.....70'
River geology...........Small to medium granite boulders
River water quality.....good to excellent, clarity good.
Scenery.................Nice Mountain scenery, most of this stretch runs away
                        from the road.
Wildlife................Deer, hawks, moose, beavers. 


StreamTeam Status: Verified
Last Updated: 2006-11-05 17:56:17

icon of message No photos found.


Gauge Information

Gauge Description:

Historical Flow Information

Historical Dates: Mean High Water Date: April 23rd / 707 cfs Mean Low Water Date: August 27th/ 63 cfs Based on 67 years of flow information
The table above gives the historical mean high and low flow dates for this particular stretch of river. This information is extrapolated from the USGS database.

USGS gauge located at the takeout on river left. The Ammonoosuc starts high up on Mt Washington (6288') and runs later in the season than most other White Mountain rivers. Late April and early May is generally the high water period. Forecast

River Flow information

Gauge: USGS (Bethlehem) Minimum level: 3.1?/429 cfs

Low: 3.7?/660 cfs

Medium: 5.0?/1380 cfs

High: 5.5?/1800 cfs

Waterline: 1-800-452-1737 site code: 331114

Gauge Information

Name Range Difficulty Updated Level
AMMONOOSUC RIVER AT BETHLEHEM JUNCTION, NH
usgs-01137500 3.10 - 6.00 ft II-III 00h48m 1.6 ft (rc= -0.5 )

RangeWater LevelDifficultyComment
3.10 -6.00 ft barely runnable-high runnable II-III

Report - Reports of Ammonoosuc 4. Twin Mountain to Pierce bridge and related gauges

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

Reports

No Reports Filed

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News





User Comments


2011-10-04 12:14:41 (129 days ago)
jacquese (151921)
Post Irene update. Carl F and I ran this section on Monday Oct 2nd at 4.07 ft on the gage. The run
is currently clear of strainers and debris. We had an enjoyable run. Lots of surf and technical
eddy hopping. Enjoy, Steve Jacques, Bartlett, NH

2011-09-05 09:24:53 (158 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,
Users can submit comments.

Rapid Descriptions

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 4. Twin Mountain to Pierce bridge, Ammonoosuc New Hampshire, US (mobile)