Cianbro replaced two double-circuit lattice towers and transmission line on a 115 kV / 34.5 kV section of the transmission line over a major river. The existing towers were replaced by two new 240-foot lattice towers and four monopole dead-end structures on an offset centerline and were reconnected back into their respective and existing lines.

• Installed and removed access for the demolition of two lattice towers and several wood structures
• Erected two 240-foot-tall lattice towers
• Erected four 75-foot steel monopoles
• Managed the installation of 12 foundations for a total of six structures
  • Four 8-foot-by-10-foot deep caisson foundations in solid bedrock
  • Eight 5-foot-by-10-foot deep caisson foundations
• Managed the removal of over 100 vertical feet of rock for foundation installation
• Managed the installation of two new lattice towers totaling almost 90 tons of steel
• Self-performed the installation of five spans of 115 kV wire with helicopter assistance and three spans of 34.5 kV wire including:
  • 21,000 feet of conductor
  • 3,200 feet of OPGW
  • 4,000 feet of OHSW
• Managed environmental efforts including endangered species restrictions

Challenges the project team encountered on this project include unpredictable Maine winter weather, the logistical coordination between the two work sites (hour-long driving distance), access and terrain due to the topography along the river bank, and completing a majority of the work on the grounds of a fully-functioning private school.