Proposition 441

Proposition 441 passed with support from 76% of Flagstaff voters in the November 2022 election. The Proposition invests $57 million in City of Flagstaff wildfire suppression, stormwater flood mitigation and wastewater treatment infrastructure. Specifically, $26M of this funding will be used to fund stormwater infrastructure improvements in the Spruce Wash area to lessen the impacts of flooding in affected neighborhoods.

The Phase II Feasibility Study conducted by Peak Engineering has identified seven projects to be constructed with the $26 million in funding from Prop 441.

These projects will help to mitigate post-wildfire flooding in the Spruce Wash. A short description of each project is listed below. The seven projects are funded by Prop 441 and will be constructed in addition to the Park Way Basins and the Killip Basins Inlet, which are funded through other sources.

  1. Grandview Drive Reconstruction: Grandview Drive will be reconstructed from a crowned street with rolled curb to an inverted crown street with vertical curbs. The joining cul-de-sacs will also be reconstructed with new curb, gutter and pavement. New water and sewer mains and services will replace aging facilities in the areas of street reconstruction. 

  2. “The Wedge” Detention Basin: A detention basin that would receive diverted flows from Spruce Wash.   

  3. Linda Vista Drive Crossing: A new box culvert crossing will be constructed to replace the existing corrugated metal pipes, which will reduce the potential for overtopping of Linda Vista Drive. 

  4. Cedar Avenue to Linda Vista Drive Channel: The channel will be re-graded and hardened to improve capacity for stormwater runoff conveyance.  

  5. Cedar Avenue Crossing: The Spruce Wash channel will be reconstructed to convey a higher flow rate. The existing box culvert drop inlet will be reconstructed to match the new channel flow line, and the existing box culvert under Cedar Ave will be evaluated and potentially upsized.

  6. Arroyo Seco Drive to Dortha Avenue Channel: The channel will be re-graded and hardened to improve capacity for stormwater runoff conveyance. 

  7. Arroyo Seco Drive Inlet: A reconstructed inlet structure for the purpose of increasing the inlet capacity to capture more stormwater into the existing 60-inch storm drain. 

  8. Killip Basins Outlet: An outlet structure will be constructed from the Killip School Regional Detention Basins to an existing pipe in Main Street to serve as a secondary outlet for larger storm events, preventing water from overtopping the basins.

  9. Killip Basins Inlet: An inlet structure will be constructed into the Killip School Regional Detention Basins to connect the basins to the existing stormwater conveyance to provide a controlled flow into the detention basins. 

  10. Park Way Basins: A series of basins designed to capture debris and sediment to reduce the risk of stormwater infrastructure clogging downstream. 

All of these projects are tentatively scheduled to be completed by 2026, with design and construction phases for each project phased as efficiently as possible. More information on these projects, including specific project timelines, will be shared with residents as they become available.