Olathe continues to experience healthy growth in both residential and commercial/industrial development. Much of this development is concentrated in the southwestern portions of the City, specifically south of 143^rd Street and west of US-169 highways. In order to continue to serve the growth in these areas, additional sanitary sewer infrastructure is needed to provide service to and also convey flows from these areas. Construction of these improvements will allow the City to continue to provide new housing, commercial and industrial opportunities to those looking to make Olathe home.

As of February 2025, tree clearing work along the alignment of the new sanitary sewer lines has begun. This work will continue through March 2025. Excavation for the sanitary sewer lines and construction of the regional sewer pump station at Lake Olathe is expected to begin in April 2025. Please expect to see construction traffic, materials, equipment, and most importantly, construction activity on site. The City will post updates to the project website throughout construction. We will also post any traffic impacts as a part of this work to our Road Closures & Construction Projects page.

July 3, 2025

On Monday, July 14, Dennis Ave will be closed for construction between Wardcliff Dr. and Lakeshore Dr. on the south side of Lake Olathe. Access will be maintained for residents inside the closure area throughout construction. Through traffic on Lakeshore Dr. will also be maintained. The closure is currently anticipated to last six weeks.

June 27, 2025

Blasting activities continue along the alignment of the new sanitary sewer lines, with work now occurring along the north side of Cedar Lake. After this area is completed, the blasting contractor will complete the remaining areas near 127^th Street and then between Old 56 Highway and 159^th Street. Notifications continue to be provided to all impacted properties along the blasting corridors.

In the last month, pipeline crews began installing the first sections of the sanitary sewer line starting at the City’s Cedar Creek Wastewater plant located on 119^th Street adjacent to Cedar Creek. Crews will continue to work south from this area, while additional pipeline crews have begun installing pipe south of 135^th Street. Beginning in the next couple of weeks, a third set of crews will begin installing pipe from the future pump station building located on Dennis Avenue and will cross Dennis Avenue and move south towards Old 56 Highway. As part of this work, Dennis Avenue will be closed for a period of 4-6 weeks beginning in mid-July to allow for the pipe to be installed across Dennis Avenue. Information on this road closure along with detour information will be available on the City’s webpage for Road Closures: https://www.olatheks.gov/government/public-works/road-closures-construction-projects

On May 19, 2025, Cedar Lake Park was closed to the public while sewer line construction work begins across the north side of Cedar Lake Park. Following the sewer line construction, the City will begin a construction project to make improvements to the existing dam at Cedar Lake Park. Cedar Lake Park will remain closed during construction of both projects and is expected to reopen once restoration is completed in 2026. Also on May 19, 2025, the Cedar Creek trail between Cedar Lake Park and Old 56 Highway was closed. Large sections of the Cedar Creek trail between Dennis Avenue and Cedar Lake Park will be impacted by construction activities and will remain closed until restoration of the trail is complete. As portions of the trail are restored, the City will gradually reopen portions of the trail to public access. As trail sections reopen, this information will be posted to this project page and will also be communicated out through Olathe Park & Recreation communications. At this time, it is expected that the first sections of the trail will reopen south of Dennis Avenue sometime in the Spring of 2026.

There will also be intermittent trail closures along Johnson County’s Cedar Niles trail between 135^th and 119^th Street during this project. Information on trail closures along Johnson County trails can be found on the county’s Rainout Line webpage: https://rainoutline.com/search/dnis/9136866220

Finally, construction has begun on the new sanitary sewer pump station located on Dennis Avenue, just west of the main entrance to Lake Olathe Park. Foundation work for the new pump station will begin over the next few weeks and all below ground work is expected to be completed around the end of the year 2025. The above ground portions of the pump station will begin construction in early 2026 with expected completion occurring sometime in late Summer/early Fall 2026.

May 14, 2025

Blasting activities have begun for the project along the alignment of the new sanitary sewer line between Dennis Avenue and Old 56 Highway. Blasting will slowly progress from north to south with daily blasts scheduled to continue over the next several months as the blasting contractor moves from Dennis Avenue all the way south to 159^th Street along Cedar Creek. There will be additional blasting occurring across the north side of Cedar Lake Park. Notifications will be provided to all impacted properties along the blasting corridor.

The contractor responsible for trenching and installing the sewer pipelines is scheduled to begin this work beginning the week of May 19. The first pipeline crews will begin installing pipe from the City’s Wastewater Treatment Plant on 119^th Street and will work south towards 127^th Street. Additional crews are expected to begin installing sewer pipes along Lakeshore Drive on the west side of Lake Olathe and also between Dennis Avenue and Old 56 Highway over the next couple of months. Over the summer, road closures are expected on 127^th Street and Dennis Avenue while crews dig across these roads to install pipes. Information on road closures will be provided on the City’s webpage for Road Closures: https://www.olatheks.gov/government/public-works/road-closures-construction-projects

Beginning on May 19, 2025, Cedar Lake Park will be closed to the public while sewer line construction work begins across the north side of Cedar Lake Park. Following the sewer line construction, the City will begin a construction project to make improvements to the existing dam at Cedar Lake Park. Cedar Lake Park will remain closed during construction of both projects and is expected to reopen once restoration is completed in 2026. Also beginning May 19, 2025, Cedar Creek Trail between Cedar Lake Park and Old 56 Highway will be closed. Large sections of trail between Dennis Avenue and Cedar Lake Park will be impacted by construction activities and will remain closed until restoration of the trail is completed. As portions of the trail are restored, the City will gradually reopen portions of the trail to public access. As trail sections reopen, this information will be posted to this project page and will also be communicated out through Olathe Park & Recreation communications.

There will also be intermittent trail closures along Johnson County’s Cedar Niles Trail between 135^th Street and 119^th Street during this project. Information on trail closures along Johnson County trails can be found on the county’s Rainout Line webpage: https://rainoutline.com/search/dnis/9136866220

April 18, 2025

Tree clearing operations have largely been completed on the project and the contractors will continue to work over the next few weeks to complete mulching and removal of tree debris from all areas. Beginning the week of April 21, the Cedar Creek Trail will be closed between Dennis Avenue and Old 56 Highway for an extended period of time while the contractor completes cleanup activities from the tree clearing work and prepares for blasting activities to take place in these areas. Blasting activities are tentatively expected to be followed by excavation and installation of the sanitary sewer piping through this area. The closure is tentatively expected to last through June 2025.

To complete installation of the sanitary sewer pipelines in a timely manner, multiple pipeline crews are expected to be working in several different areas at once along the full alignment of the pipelines between 159^th St and 119^th Street.  As construction progresses, information will continue to be provided for upcoming trail closures along both the City of Olathe’s Cedar Creek trail and Johnson County’s Cedar Niles trail.

March 11, 2025

Tree clearing operations should be completed between Cedar Lake and Dennis Avenue by March 15.  Grinding and mulching of trees will be taking place between Old 56 Highway and Dennis Avenue beginning March 11 and continuing through March 14.  The Cedar Creek Trail between Old 56 Highway and Dennis Avenue should be reopened to the public on Saturday, March 15.

Grinding and mulching of cleared trees will take place along the Johnson County Cedar Niles trail between 135^th and 127^th the week of March 17.  This section of the Cedar Niles trail will be closed while this work is completed and will be reopened at the end of the week.

February 20, 2025

Tree clearing operations are taking place along Cedar Creek between 159^th Street and 119^th Street. This work is expected to continue through March 2025. As part of this work, there will be intermittent trail closures along the City of Olathe’s Cedar Creek Trail between Lake Olathe and Cedar Lake and also along Johnson County Parks and Recreation’s Cedar Niles Trail between 135^th and 119^th Street. Information on trail closures will be communicated through by both the City of Olathe and Johnson County Parks and Recreation.

Pipeline construction work and excavation for the Regional sewer pump station at Lake Olathe are anticipated to begin in April 2025. The City will provide updates on specific locations of work as construction progresses.

View the temporary parking map below:

Tree clearing operations are currently underway and are anticipated to continue through March 2025.  Pipeline construction work and excavation for the regional sewer pump station at Lake Olathe are anticipated to begin in April 2025. Construction is expected to be completed by the end of 2026. The City will provide updates on specific locations of work as construction progresses. 

A public information meeting was held on January 30, 2025, at Eagle’s Landing at Lake Olathe. Project plans were made available for viewing and information was provided on the anticipated construction schedule for the project and potential impacts to Olathe’s Cedar Lake Park and Cedar Lake Trail.