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Northern River Assessment
Project
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Findings of Fluvial
Geomorphic Assessments
A fluvial geomorphic assessment seeks a
scientific understanding of how the nature of a
river's watershed and human land use affect the
river channel. Rivers are constantly adjusting to
many changes, from dam building or breaching to
road and railroad building and even deglaciation.
Understanding how these changes alter the width,
depth, and form of a river channel is essential for
identifying potential problems in a river system
and identifying long-term solutions for channel
instability.
The results of our 2004 and 2005 investigations
are presented below.
New river restoration planning is underway on
Mill Brook in Stark and the lower Mohawk River in
Colebrook. Learn
more.
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Erosion Maps of Northern
River Towns
The erosion maps posted here were created for
CRJC by Dr. John Field of Field Geology
Services, based on his 2004 assessment of 85 miles
of the Connecticut River in northern New Hampshire
and Vermont. Each town has received a large
planning scale version of these maps, showing
erosion and riverbank condition. At
right: Northumberland, NH
(Note: Mapping software is not
necessary to view or print these maps, although
Adobe Acrobat Reader must be installed on
your computer. If you do not already have this
software, you may download it for free. Click here:

Download the guide that accompanies these maps
(large file):
Causes
and Management of Bank Erosion on the Upper
Connecticut River
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Vermont Erosion
Maps
Canaan (northeast,
north,
central,
south)
Lemington (north,
central,
south)
Bloomfield (north,
central,
south)
Brunswick (north,
central,
south)
Maidstone (north,
south)
Guildhall (north,
south)
Lunenburg (north,
central,
south)
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New Hampshire Erosion
Maps
Pittsburg (central,
south)
Clarksville (north,
central,
south)
Stewartstown (north,
central,
south)
Colebrook (north,
south)
Columbia (north,
central,
south)
Stratford (north,
central,
south)
Northumberland (north,
central,
south)
Lancaster (north,
central,
south)
Dalton (north,
south)
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Fluvial Geomorphology
Assessment of the Northern Connecticut River,
Vermont and New Hampshire
Field Geology Services,
October, 2004
A fluvial geomorphic
assessment of 85 miles of the northern Connecticut
River between Murphy Dam in Pittsburg, NH
downstream to Gilman Dam between Gilman, NH and
Lunenburg, VT has identified the major natural and
human factors controlling channel morphology and
causing bank erosion.
Final
Report
selected
appendices:
Phase
2 Cross-Sections of 18 Reaches
Options
for Restoration at the Colebrook Industrial
Park

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Bank Stabilization Implementation and
Assessment of the Connecticut River near Colebrook
and Groveton, New Hampshire.
Field Geology Services, January
2006
Continuing efforts to address
bank erosion problems along the Connecticut River
have led to the permitting of a bioengineering
project at the Colebrook Business Park, a detailed
assessment of bank instability at the
Northumberland Cemetery, and production of erosion
hazard maps for each town in the study area.
Bank instability at the
Northumberland Cemetery is related to several
factors including: 1) the breaching of the Old
Wyoming Dam 3.0 miles downstream of the cemetery;
2) the breaching of Nash Stream Bog Dam in the
Upper Ammonoosuc watershed; and 3) the resulting
sand bar development on the Connecticut River at
the confluence with the Upper Ammonoosuc
River.
Final
Report
selected appendices:
Phase
3 Survey Data
Hydraulic
Modeling Results
Bioengineering
Design Specifications,
Colebrook Business Park
Conceptual
Restoration Designs,
Northumberland Cemetery
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Fluvial Geomorphology Assessment of Northern
Connecticut River Tributaries
Field Geology Services,
January 2006
A fluvial geomorphic
assessment of the Mohawk and Upper Ammonoosuc
Rivers, tributaries to the Connecticut River in New
Hampshire, has identified the major natural and
human factors controlling sediment delivery to the
Connecticut River mainstem where bank erosion
threatens the Colebrook Business Park (adjacent to
the Mohawk River) and Northumberland Cemetery
(adjacent to the Upper Ammonoosuc).
Final
Report
selected
appendices:
Lower
Mohawk River Conceptual Design
Options
Mill
Brook Conceptual Design Options
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Mohawk River Stream
Restoration Planning
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Restoration planning is
occurring on the lower Mohawk River near its
confluence with the Connecticut River in Colebrook,
NH. The project will result in engineering designs
for the long-term resolution of erosion problems at
the Colebrook Business Park on the mainstem of the
Connecticut River, caused by sediment deposition at
the mouth of the Mohawk River after the channel was
artificially straightened several decades ago.
Other benefits will be the creation and improvement
of habitat and reduction of sedimentation. The work
is an outgrowth of previous studies (see above) and
is supported by grants from the Upper Connecticut
River Mitigation & Enhancement Fund of the NH
Charitable Foundation and the Watershed Assistance
and Restoration Program of NH Dept. of
Environmental Services. Field Geology Services is
conducting the study.
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