If you walk or bike the Tony Knowles Coastal Trail near Westchester Lagoon, you may have to adjust your route while crews put the final touches on a bridge replacement that started last fall.

A section of the trail that extends from the Fish Creek bridge to the three-way intersection where the Coastal Trail meets the Chester Creek Trail is closed.

The bridge at the south end of Westchester Lagoon is the fourth to be replaced after an engineering report found five bridges on the trails structurally unsound. That followed a pedestrian bridge collapse at the north end of the lagoon in 2014. Most of the replacement was done last fall.

Workers are finishing up the project in the next two weeks, pouring additional concrete and paving the 300-foot bridge. Maeve Nevins-Lavtar, park planner with the Anchorage Parks and Recreation department, says the trail will remain closed this week but open again on Friday, May 17 for Bike to Work Day and stay open through the weekend.

She said work will resume on Monday, May 20 and should be completely finished by May 24, in time for Memorial Day. Until then, people are asked to use a detour.

Crews are also working on Phase three of a restoration of the Campbell Creek Trail. It includes repaving from E. 76th Avenue at north Taku Lake Park to Lynwood Park.

Nevin-Lavtar said that section of the trail, which is currently closed, will also be open temporarily for Bike to Work Day on Friday and should be completed by the beginning of July; a detour is available.

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