Project Overview
To support increased grid strength in an area experiencing growth in wind power assets, Liberty selected Mortenson to design, procure, construct, commission, and complete the rebuild of the 91-0 transmission line spanning Missouri and Arkansas. The project rebuilt 45 miles of 161kV transmission infrastructure, replaced aging transmission structures, and emphasized landowner communication and community engagement throughout project delivery.
Key Takeaways
- Rebuilt Liberty's 45-mile, 161kV single-circuit 91-0 transmission line across Missouri and Arkansas.
- Replaced 250 aging wood H-frame structures with freestanding and guyed steel structures.
- Completed construction ahead of schedule.
- Achieved zero recordable injuries during project execution.
- Implemented a landowner communication plan that included mailed letters, phone calls, and community flyers.
- Supported local community initiatives in partnership with Liberty Utilities and area organizations.
- Delivery Method
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General Contractor
- Additional Project Facts
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45-Mile 161kV Transmission Line Rebuild
Completion Date: December 2020
Replacing Aging Transmission Infrastructure
A major component of the project involved replacing aging transmission structures throughout the corridor.
Mortenson replaced 250 wood H-frame structures with steel structures. The majority of the replacement structures were freestanding, while guyed structures were utilized at angle locations. Installation activities also required significant rock drilling to support structure foundations throughout the route.
While the existing conductors were reused, the project included replacement of the optical ground wire (OPGW).
Coordinating with Landowners and Communities
Because the transmission corridor crossed numerous private properties, Mortenson developed and implemented a comprehensive communication strategy to help minimize disruption and maintain open communication throughout construction.
The outreach effort included:
- Mailed letters to landowners
- Direct phone calls
- Informational flyers distributed throughout local communities
This approach provided landowners and community members with project information before and during construction while helping maintain engagement throughout project delivery.
Delivering Safety, Schedule Performance, and Community Support
The Liberty 91-0 Transmission Line Rebuild was constructed under a demanding schedule while spanning two states and numerous landowner properties. Through project planning, coordination, and execution, Mortenson completed construction ahead of schedule and achieved zero recordable injuries.
In addition to project delivery activities, Mortenson partnered with Liberty Utilities and local organizations to support community initiatives throughout the project area. The team contributed gift cards to Liberty Utilities' Elf Program, which supports elderly residents during the holiday season.
Mortenson also supported Children's Haven, an organization that provides temporary shelter and care for children while families work through crisis situations. In addition to financial contributions, the team donated holiday gifts for children participating in the program.