American
Transmission Co. has just completed its work in the Milwaukee Zoo Interchange to relocate and
erect new electric transmission infrastructure to accommodate the Wisconsin
Department of Transportation’s interchange expansion plans.
ATC
began the transmission line portion of the project in June 2013 to relocate
seven overhead 138-kilovolt transmission lines and erect 59 single pole
structures to replace 58 lattice towers.
“Residents
and commuters were able to watch the transformation over the past year and a
half while we removed the old structures, installed the new poles and strung
wire across six lanes of traffic – all while the interchange was kept open to motorists,”
said Barbara Mikolajczyk, ATC major project manager. “We were able to complete
our work more than two months ahead of schedule because there was great
communication and collaboration among the DOT and the multiple utilities
involved.”
“Because ATC completed its portion of the project ahead
of schedule, that helps our scheduling with other contractors this winter and
next spring,” said DOT Construction Project Manager Mike Burns.
Project highlights include:
- Line energized and project complete: November
2014 – two-and-half months ahead of schedule
- Line length: approximately 11 miles
- Voltage: 138,000 volts
- 58 lattice structures removed (circa 1954);
equals 1.24 million pounds of steel removed
- 59 new single-pole structures erected; equals
2.3 million pounds of steel installed
- 40.5 miles of wire removed and new wires installed
- Transmission pole height: 115 to 180 feet; new poles are 50-60 feet
taller than the lattice structures
- Tallest transmission pole: 180 feet with five
sections, nine feet in diameter at the base and weight of 130,000 pounds
- Longest span between two transmission poles: 1,000 feet
- Project cost: approximately $50 million