Posted on September 11th, 2017 by

The New Hampshire Site Evaluation Committee (SEC) will today hear from Terry DeWan and Jessica Kimball of  Terrence J. DeWan & Associates, a landscape architecture and planning firm located in Yarmouth, Maine. Both conducted research and compiled data that was submitted as part of the Northern Pass’ state application, including view simulations along the proposed route. Northern Pass has made the photo simulations of the proposed route available on its website.

Key Points:

  • A visual impact assessment, or VIA, is a systematic analysis of possible changes to the visible landscape resulting from proposed development activity, and the investigation of possible means to avoid, minimize or mitigate the effects of the change
  • The methodology follows a systematic path of inventory, analysis, and determination of effect. It is based upon established criteria developed by federal and state agencies over the past several decades, and is similar to previous work done with regards to transmission lines and other VIA projects
  • Scenic resources are defined as publicly accessible places that have been recognized by local, regional, state, or national authorities for their scenic or recreation quality and are visited by the general public, in part for the use, observation, enjoyment, and appreciation of natural, cultural, or visual qualities. All scenic resources that were identified within the Northern Pass Project Study Area were mapped and added to a database for further evaluation
  • Of the 525 scenic resources identified within three miles of the proposed route, none had overall visual impacts that were characterized as ‘high’, based on the observations and methodology used
  • A significant number of mitigation measures have been incorporated into the planning and design of Northern Pass including:
    • Locating portions of the Project underground to avoid sensitive scenic resources, such as the White Mountain National Forest
    • Using existing road rights-of-way (ROW) for most of the underground sections to minimize the need for new cleared transmission corridors
    • Co-locating the majority of the transmission line in existing transmission corridors to minimize the amount of new corridors
    • Using weathering steel monopole structures in certain areas results in a decrease in color contrasts with the surrounding landscape because they are generally darker in color and have a hue that is more commonly found in the landscape. Monopole structures also have a thinner profile and a simpler appearance than lattice structures
    • Locating new transmission structures in proximity to existing structures in certain locations to maintain the same spacing and avoid irregular linear patterns that can be caused by adjacent conductors being out of synch with each other
    • Matching the materials used for both the relocated 115 kV structures and the proposed transmission structures to minimize contrasts in color and texture and contribute to a sense of visual continuity within the corridor
    • Relocating existing transmission and distribution lines within the existing corridors to provide adequate clearance for the proposed structures and minimize the amount of clearing necessary for their installation
  • Northern Pass as a whole will not be a dominant feature in the landscape. The views from most of the scenic resources already contain evidence of existing human development, often prominently visible from the key observation points
  • Northern Pass will not result in unreasonable adverse effects on aesthetics, to either the six subareas that were identified or to the approximately 900 square-mile Project Study Area as a whole


Posted on September 11th, 2017 by

Posted In: Permitting, SEC