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Flood control district approves IGA with Flagstaff to transfer Parkway sediment-basin ownership and maintenance
Summary
The Coconino County Flood Control District voted to transfer ownership and maintenance of the Parkway sediment basins to the City of Flagstaff under an intergovernmental agreement, concluding a multiagency mitigation project funded largely with NRCS support.
The Coconino County Flood Control District approved an intergovernmental agreement (IGA) on April 1 transferring ownership and maintenance responsibility for the Parkway sediment basins to the City of Flagstaff.
The basins were constructed as a multiagency response to post‑wildfire flood risk created by the 2019 Museum Fire, which generated substantial watershed sediment and prompted mitigation work above Mount Elden and the Parkview/Grandview neighborhoods. Vice Chair Patrice Horstman and flood-control staff described the basins as an “integrated system” that captures sediment upstream so downstream infrastructure and neighborhoods can be protected.
Lucinda Andreani, Flood Control District administrator, and county staff highlighted the Natural Resources Conservation Service (NRCS) and U.S. Department of Agriculture participation. Staff said the Parkway project was one piece of a broader set of post‑fire watershed-restoration and flood‑mitigation investments across nine watersheds; one speaker noted cumulative regional work in the tens of millions of dollars when downstream infrastructure and tunnels are included.
Under the approved IGA, the City of Flagstaff will assume maintenance responsibilities for the basins because they sit on city property and integrate with the city’s downstream infrastructure projects. The district’s action frees flood-control staff to concentrate on other mitigation priorities and reflects the conclusion of construction and initial performance assessments; county staff said the basins had performed as designed during recent monsoons.
The flood-control board’s resolution (Resolution 25-2025-1) was moved by Director Patrice Horstman and seconded by Director Tammy Ontiveros; the motion carried unanimously.
Speakers quoted in this article are drawn from the meeting record: Vice Chair Patrice Horstman; Lucinda Andreani (Flood Control District Administrator); County Manager Andy Bertelsen; Supervisor/Director Tammy Ontiveros.
