Updated at 7:30 p.m. on Wednesday, Oct. 26

If you enjoy walking, running or biking on the Tony Knowles Coastal Trail, get ready for some detours.

Work began to replace two bridges on the trail, starting with the Sisson Loop bridge at mile 6.6 of the trail on Oct. 17. Work on the Fish Creek bridge followed about a week later.

Anchorage municipal park planner Maeve Nevins said crews are removing the bridges — one of which was built in the 1980s — after a similar bridge near Westchester Lagoon collapsed two years ago. She said it’s an ongoing project that will take several months to complete and people who use the trail can expect detours through December.

“The total closure for each section is going to be anywhere from four to six weeks,” Nevins said. “ So we are saying the beginning of December is when we will reopen and that will be reopening just for the winter and then next spring we will come in and repave the whole area.”

Nevins said there are a total of four bridges that need replacing. Voters are financing the current projects with a bond passed in 2015. Nevins said it’s likely the city will look to bonds again to replace the remaining two bridges.

Visit the Municipality of Anchorage’s website for more information on the project.

KTVA 11’s Lauren Maxwell can be reached via email or on Twitter.