Consideration and Adoption of Resolution No. 2025-18: A resolution of the Flagstaff City Council, approving an Intergovernmental Agreement between the Coconino County Flood Control District and the City of Flagstaff to repair damaged sediment basins and trails and transfer right, title, interest and ongoing responsibilities for the same from the District to the City
 

1. Read Resolution No. 2025-18 by title only
2. City Clerk reads Resolution No. 2025-18 by title only (if approved above)
3. Adopt Resolution No. 2025-18

The sediment basins have been constructed by the Coconino County Flood Control District (CCFCD) and were funded in part by the Natural Resources Conservation Service as part of an Emergency Watershed Protection (EWP) grant. The basins are constructed within the Spruce Wash floodplain with a primary purpose to capture sediment flowing from post-fire runoff following the 2019 Museum Fire. That fire burned over 1,900 acres, including 52 percent of the watershed of the Spruce Wash. This IGA will allow the Water Services Stormwater team to provide ongoing inspections and maintenance to the basins and service road as recommended by Natural Channel Design Engineering Co.
Tasks include:

• Inspect sediment accumulation in the basins after significant runoff events or annually at a minimum.
• Remove sediment to restore original storage volume
• Inspect rip rap and repair as necessary
• Inspect channel both upstream and downstream of the basins and remove large woody debris

Minimal budget impact. Existing staff will inspect and maintain the Park Way basins similar to other maintained regional detention basins.

This IGA transfers responsibility of inspection and maintenance tasks of the Park Way basins from the CCFCD to the City.

No previous decisions, however; the Park Way basins were constructed by CCFCD in support of the City's Spruce Wash flood mitigation efforts approved as part of Prop 441 in November 2022.

1. Approve the IGA to maintain the Park Way basins
2. Reject the IGA to maintain the Park Way basins, lack of maintenance reduces the ability of the detention basins to serve their intended purpose of flood control.

• High Performing Governance: Serve the public by providing high quality customer service
• Safe and Healthy Community: Provide public safety services with resources, staff,and training responsive to the community's needs
• Sustainable and Innovative Infrastructure: Deliver outstanding services to residents through a healthy well-maintained infrastructure system
• Environmental Stewardship: Strengthen Flagstaff's resilience to to climate change impacts on the built, natural, economic, health and social systems

Goal E&C.3.

• Policy E&C 3.1 Increase the region’s preparedness for extreme climate events.

Goal WR.5.

• Policy WR.5.1. Preserve and restore existing natural watercourse corridors, including the 100-year floodplain, escarpments, wildlife corridors, natural vegetation, and other natural features using methods that result in a clear legal obligation to preserve corridors in perpetuity, where feasible.
• Policy WR.5.4. Develop any necessary stormwater infrastructure improvements consistent with City of Flagstaff stormwater master plans or studies as adopted by the City.
• Policy WR.5.5. Give preference to regional detention facilities that are designed in conjunction with smaller low-impact development features, rather than numerous smaller dispersed basins. Encourage regional detention basins to incorporate natural watershed characteristics as well as offering recreational components.

Goal PF.1.

• Policy PF.1.2. Allocate available public resources necessary for the City and County to prepare and adapt for natural and human-caused hazards so that all government operations support community resiliency.
• Policy PF.1.4. Build, sustain, and leverage partnerships with local and regional stakeholders for collective investment, efficient action, and shared responsibility in the building of local resiliency.

CR-2 Strengthen existing community systems to create resilience to both short-term shocks and long-term change

None

Stormwater Manual