Flood Control Zone District

Capital Projects

Capital Projects



No. 1 Canyon Flood Debris Basins: A team of experts designed a series of flood debris basins that were built on county-owned land in No. 1 Canyon in Wenatchee. The debris basins will provide a collection-and-release point for reoccuring, debris-laden floodwaters that often strike the canyon following rain events or during heavy snowmelt. Construction was completed in March 2023.



Ski Hill Basin Analysis: In the past, the Ski Hill Basin has experiencd increased volumes of runoff, impacting both public and private property. A FCZD consultant team completed an analysis of the basin identifying flood risks and creating a framework for reducing flooding impacts to public and private property within Chelan County and the City of Leavenworth. The analysis will guide future capital projects that will protect property and the health and safety of the public.

No. 2 Canyon Mitigation Strategy Analysis: Located west of the city of Wenatchee, No. 2 Canyon is a 9.5-square-mile basin that is situated along the east slopes of the Cascade Mountain foothills. Runoff from the canyon's high slopes pose a significant risk to public and private property and safety. A comprehensive assessment of the No. 2 Canyon conveyance in both Chelan County and the city limits will be used to assist the two agencies in identifying and mitigating flood risks. The assessment will be a tool in guiding future capital projects that protect property and the health and safety of the public from flooding. It is expected to take about two years to complete.



Slide Ridge Retrofit: A team of experts designed a bridge structure for this location to eliminate Slide Ridge’s impact on South Lakeshore Road (photo above). A bridge reduces the risk of damage to life and property through the conveyance and control of mud and debris flows originating from Slide Ridge. A bridge also ensures a year-round, continuous corridor for the community that surrounds Lake Chelan and it will be a proactive solution to a problem that Chelan County has dealt with for decades. Construction was completed in 2022.

No. 1 Canyon Conveyance Project: Completed in 2018, construction involved the installation of 450 feet of 36-inch culvert to aid in the conveyance of reoccuring flood flows from No. 1 Canyon.

No. 1 Canyon Gap Analysis: No. 1 Canyon can be characterized as having a steep channel profile throughout its 6.8-square-mile basin, allowing for alluvial sediment transport in debris flows typically occurring during floods on the order of 10-year and greater recurrence intervals.  When this happens, flooding of private and public property occurs, leaving costly cleanup to homeowners, Chelan County and the City of Wenatchee. The Gap Analysis analyzes the basin as a whole and determines where and what is needed to minimize the damage experienced from this type of flooding event.

Antoine Creek Road Culvert Replacement: Spring runoff events in the Antoine Creek Basin have been so severe since the 2015 Chelan Complex Fire that on more than one occasion the water has left the creek bed and covered Antoine Creek Road, causing severe road damages and even landlocking some property owners until waters receded. Three culverts that run adjacent to the road could no longer convey these increased water flows; they were upsized to box culverts, allowing for increased water flows and debris to pass during larger runoff events. Paid for in part with a $180,000 federal post-fire grant, the project was completed in July 2021.

Posted: 10/30/2019 08:35 AM
Last Updated: 04/19/2023 10:43 AM

Chelan County Calendar

Upcoming events and schedules at the county!

  • 25
    Jun 2024
    10:00 AM - 11:00 AM

    Public Meeting: Official Logic and Accuracy Test of Voting System and Accessible Voting Unit (AVU) Demonstration

    Posted by: Chelan County Elections

    Chelan County Auditor’s Office
  • 21
    Jun 2024
    08:00 AM - 05:00 PM

    Ballots mailed for military, overseas and out of state voters

    Posted by: Chelan County Elections

    Ballots mailed for Military, Overseas and Out of State voters

  • 19
    Jun 2024
    01:00 PM - 02:00 PM

    Hearing Examiner - June 19, 2024

    Posted by: Community Development

    By Zoom Video Conference or in person call 667-6518 ******HOLIDAY***********
  • 05
    Jun 2024
    11:00 AM - 12:00 PM

    Chelan County Civil Service Commission

    Posted by: Human Resources

    The Chelan County Civil Service Commission will be meeting on June 5, 2024.

    Chelan County Commissioners Office, ES Conference Room.
  • 05
    Jun 2024
    09:00 AM - 10:00 AM

    Hearing Examiner - June 5, 2024

    Posted by: Community Development

    By Zoom Video Conference or in person call 509-667-6518