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Council approves $80,046 AECOM amendment for additional hydrologic modeling on Flying Fortress/Airway extension
Summary
City council approved a $80,046 amendment to AECOM’s services to fund additional hydrologic modeling and plan revisions for drainage where Flying Fortress Parkway and Airway Avenue cross Rattlesnake Wash.
The Kingman City Council on Tuesday approved a professional‑services amendment with AECOM for additional hydrologic modeling related to the Flying Fortress (formerly Rancho Santa Fe) Parkway and the Airway Avenue roadway extension.
Background and why it matters
AECOM designed the Flying Fortress Parkway interchange and the connection of Flying Fortress and Airway Avenue to Prospector Phase 2. County flood‑control staff completed updated FEMA modeling with higher‑resolution terrain data that identified increased stormwater flows (Rattlesnake Wash) crossing the planned roadway corridor. City staff said additional modeling and plan revisions were required to ensure the culverts and roadway drainage would safely convey flows.
The amendment and council discussion
The amendment adds $80,046 to the AECOM contract to perform the needed hydrologic and hydraulic modeling and to revise plans for culverts under Flying Fortress Parkway and Airway Avenue. City Manager Tim Walsh told the council that timing was critical: off‑ramps and paving work on the interchange are already under construction and final roadway design needs to be complete so the city can bid and build its roadway sections concurrently.
Walsh said the additional work had been delayed during a dispute over an adjacent development agreement but that recent settlement/closing on relevant parcels meant the city should move forward with the modeling now to avoid schedule conflicts. He noted that if the adjacent property owner (KDP Managers) proposes to provide alternate drainage accommodations at no cost to the city, the city could consider that proposal later, but the design path approved Tuesday keeps drainage along its historical pattern and advances the project timeline.
Funding and next steps
Funding for the amendment will come from the I‑11 East Kingman Connection Project Fund, staff said. Once the modeling and plan revisions are complete, staff expects to put the roadway construction work out to bid and return to council with construction approvals and estimated costs for the earthwork and culverts identified in the revised plans.
Outcome
Council approved the AECOM amendment by motion; staff will continue design and bring construction bids and timelines to council when available.
