An upcoming Puget Sound Energy construction project at the Agate Pass Bridge will likely cause traffic delays of an hour or longer over the week following Sept. 1.

The construction project centers on improving the electrical system between the north end of Bainbridge Island and Suquamish.

The project will replace two transmission lines, and two lattice steel towers built over 50 years ago with four 140-foot-tall weathered steel poles.

The replacement of the towers is expected to begin on Sept. 1, and will probably take the rest of the week to finish. The new poles won’t be able to set for another four weeks once the concrete foundations are in place.

The steel poles will be set in early to mid-October. After the new transmission wires are strung, removal of the old towers will start.

Workers are busy clearing trees and bushes to be prepared for the hard work to come after Labor Day weekend.

It’s important that the towers be quickly replaced since they are the only two medium-capacity transmission lines carrying power between Bainbridge and Suquamish, PSE officials said.