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Spruce Wash Flood Projects Continue 

City-County-US Forest Service Work Together to Increase Channel Capacity 

Post Date: 10/29/21


The Stormwater Section completed one in a series of projects to mitigate Museum Fire flooding with a channelberm and floodplain expansion at the top of Paradise Road, where Spruce Wash enters the eastside neighborhoods. This joint project with Coconino County and Coconino National Forest addresses the potential of increased flows resulting from the Museum Fire scar at the jurisdictional interchange

Channel improvements were based on flood flow modeling of a 2” rainfall in one hour yielding 1329 cubic feet per second (cfs). Thisflow caption channel was designed to maximum capacity in the footprint available of up to 1460 cfs, when modeling indicated flows could overtop the barriers.

The channel was widened, and bollards were installed to bolster the concrete barriers, then backfilled to create a berm for stability, covered by erosion-control matting. Rock alignments were constructed in the channel to direct flows to the center of the channel and reduce erosion. 

bollards captionrocks caption

Water Services is in the design phase to deliver additional channel and road crossing improvements in the Museum Fire watershed, along with drainage improvements for the East Flagstaff-Dry Lake Hills watersheds. Stay tuned!

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Blog Archive


September: Telling the Story as We Plan for the Future

August: A Summer of improvements - Getting Tanked Up (PDF)

July: Testing Groundwater Recharge Strategies with Recycled Water (PDF)

June: Managing Flagstaff's Sewer Infrastructure with GIS Technology (PDF)

May: Flagstaff Plans for a New Groundwater Well in its Portfolio (PDF)

April: Coconino Estates Improvements Continue This Summer (PDF)

March: Keep Flagstaff's Water Clean: Only Snow and Rain in Stormwater Drains (PDF)

February: Rio de Flag Water Reclamation Plant Receives Necessary Upgrades (PDF)

January: McAllister Well and Pumphouse Adds Capacity to our Water System (PDF)


December: Woody Mountain Clarifier Project Wraps Up 2020 Capital Improvements (PDF)

November: Updates on Capital Improvement Projects Started in Summer 2020 (PDF)

October: Planning for Flagstaff's Water Future (PDF)

September: Flagstaff Water Services Receives Two National Water Conservation Awards (PDF)

August: Updates on Stormwater Maintenance in Flagstaff (PDF)

July: Ground-Breaking Infrastructure Upgrades Continue This Summer (PDF)

June: Focus on Infrastructure Development for Summer 2020 (PDF)

augMay: Brad Hill, Water Services Director, Retires After 12 Dedicated Years (PDF)

April: Keeping Your Water Clean and Safe (PDF)

March: Linda Vista Drive Construction Tackles Two Water Projects Simultaneously (PDF)

February: Are There "Forever Chemicals" in Our Drinking Water? (PDF)

January: Planning for the Next Decade (PDF)


July: Inner Basin Pipeline repaired just in time to aid Fire Operations (PDF)

June: Control Room Modernization at Lake Mary Water Treatment Plant (PDF)

February: Upgrades at Rio Water Reclamation Plant Improve Efficiency & Safety (PDF)


December: NAU and Flagstaff Water Services Create Winning Partnerships (PDF)

November: I-40 Transmission Line (PDF)

June: New Aerator Protects Aquatic Life in Frances Short Pond (PDF)

May: How TV Vans are a Driving Force for Efficiency (PDF)

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