Olathe sewer project reaches late-July target window, impacts continue

Olathe’s West Cedar Creek Sewer Interceptor project has reached its late-July target window for a pipeline crossing near Dennis Avenue and Wyckford Road, but that milestone does not mark the end of the larger construction effort.

In an April 15, 2026 update, the City of Olathe said crews were installing pipeline beneath a small pond east of the Dennis Avenue and Wyckford Road intersection. That portion of the work was tentatively expected to be completed by the end of July.

The target applies to one section of pipeline installation. Other major parts of the interceptor project remain active, with construction and restoration work expected to continue into fall and, in some areas, through the remainder of 2026.

What remains after the pond crossing

The project includes a large sanitary sewer line running along Cedar Creek from the 159th Street area toward a new regional lift station on Dennis Avenue near the south side of Lake Olathe. From the lift station, another line will continue north toward Olathe’s Cedar Creek Wastewater Treatment Plant at 119th Street west of Clare Road.

The regional lift station is expected to be completed in fall 2026. Pipeline installation along the north side of Cedar Lake is expected to continue through fall, and additional construction remains planned inside Cedar Lake Park.

Trail restoration is another remaining step. The city’s April update said pipeline work along the Johnson County Parks and Recreation Cedar Niles trail system was close to completion and that the full trail had reopened, but additional restoration was still expected. That work could include a short closure for asphalt replacement on sections excavated during sewer construction.

Along Olathe’s Cedar Creek trail system between Dennis Avenue and Cedar Lake, surface restoration, including reconstruction of larger sections, is anticipated to be completed by fall 2026. The city says those trails are expected to reopen at that time.

What residents should expect

Cedar Lake Park remains closed to the public because of construction. The city’s park information page directs visitors to the sewer-project updates and says the park is closed while construction continues.

The sewer-project page says the park is currently expected to remain closed through the remainder of 2026 until it can be restored to a condition safe for public access. That schedule is subject to change.

Residents, trail users and nearby property owners should continue to expect construction equipment, active work areas and changing access conditions around Cedar Lake, Dennis Avenue and nearby trails. The city posts transportation impacts through its road-closure and construction information, but individual restoration dates and other schedule targets may move as work progresses.

Why Olathe is building the interceptor

Olathe says the interceptor is needed to add sanitary-sewer capacity for continued residential, commercial and industrial development in the southwestern part of the city. The city identifies the main growth area as south of 143rd Street and west of U.S. 169.

The project is designed to provide sewer service and convey flows from those areas to Olathe’s treatment system. The city’s capital-improvement plan describes the project as including 5.6 miles of gravity sewer mains, 2.1 miles of force main and one regional lift station.

An Olathe City Council record for the project says overall completion is currently anticipated in fall 2026. The next major watchpoints are the lift-station target, trail-restoration work and any updated city notices affecting Cedar Lake Park, Cedar Creek trails or nearby roads.

Sources

• City of Olathe West Cedar Creek Sewer Interceptor Project
• Olathe City Council Amendment No. 4