Crews today will begin upgrading the irrigation main at Point Defiance Park, a project that should take about eight weeks to complete.
Nearly 7,000 lineal feet of main line, which is about the length of 20 football fields, will be installed.
Park Superintendent Vito Iacobazzi said workers will do everything possible to minimize the impact on visitors, but some areas may close and traffic could be rerouted as lines under the roads are replaced.
Pathways from the Pearl Street entrance through the pond and gardens will be affected, as well as the Visitors Center, Pagoda and tennis courts.
The project is intended to fix leaks that have persisted for decades and reduce water usage in the area by 20 percent. Millions of gallons flow through the leaking main to irrigate that area of the park, officials said.