Transmission Line Designs

A variety of transmission line designs will be used in the construction of the Gateway West transmission line. Structures will be a combination of single and double circuit towers and steel lattice and tubular steel towers. The current design standards are listed below.

Illustrations are not to scale and are for information only, as tower types and designs will vary by location along the project route. Details below describe some of the towers that could be used. Please also see our perspective photos for scale examples.
230 kV Single Circuit Steel H-Frame
Segment 1W only
Design Standards
Height: 60-90 ft
Ground clearance: 28 ft
Average span: 800 ft
Right of way: 125 ft
Segment: 1W (eastern Wyoming)
345 kV Single Circuit Steel H-Frame
Segment 3a only
Design Standards
Height: 80-110 ft
Ground clearance: 30ft
Average span: 800 ft
Right of way: 150 ft
Segment: 3a
500 kV Single Circuit Steel Lattice Tower
Most segments
Design Standards
Height: 145-180 ft
Ground clearance: 35 ft
Average span: 1,200 - 1,300 ft
Right of way: 250 ft
Perspective photos

A series of perspective photos of a 500 kV line crossing Highway 46, east to west, midway between Gooding and Wendell, Idaho