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Council briefed on $929,000 amendment to advance downtown flood-mitigation final design and lift‑station work
Summary
Staff recommended amending the HR Green professional services agreement to move flood-mitigation design from 30% to final plan/bid documents. The $929,000 amendment covers design for extended flood walls, inlet sealing near the auditorium and storm-water lift stations to pump over the wall; funding is expected from the sales-tax increment/flood-mitigation revenue.
City staff presented amendment No. 1 to the HR Green professional services agreement at the Feb. 23 work session to advance flood-mitigation work downtown from 30% design to final design and bidding documents.
Mr. McGregor described the scope: extend permanent and temporary flood walls down Market Street toward Main, design a sealing solution for storm inlets beneath the auditorium to eliminate temporary defenses (hesco baskets), and design storm-water lift stations with valved alternate storm lines to route rainwater to pumps that would discharge over the wall during high-river events. He told council that the most complex and costly element is the lift-station work and that wet-weather pump capacity and new storm-line routing will require careful construction where existing utilities converge.
The contract amendment was presented with a total estimated design cost of $929,000. Mr. McGregor said the flood-mitigation revenue stream and associated sales-tax increment would be the primary funding source for this phase of work.
Why it matters: The amendment would move critical design work forward for downtown flood protection, reduce reliance on temporary protective measures at key facilities and identify construction-level details around storm piping and pump capacity. The work will require coordination with other utilities and minimize disruption at recently paved intersections where possible.
Next steps: Council was asked to consider the resolution as part of the next regular agenda; staff will bring the amendment forward for formal action. The design will inform final cost estimates and subsequent construction bidding.
