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City releases stream‑bank stabilization assessment; staff says repairs will take years and require new funding choices
Summary
City engineering staff presented a citywide stream‑bank stabilization assessment that identified more than 3,000 erosion locations and estimated roughly $91 million in prioritized city‑responsibility repairs; staff said completing that work would take about 20 years without additional funding.
Caleb Thornhill, director of engineering, presented the results of a citywide stream‑bank stabilization assessment conducted by staff and consultants. Thornhill said teams walked roughly 127 miles of channel (an initial 30 miles then about 97 more) and identified more than 3,000 locations with signs of erosion. He said the assessment used a 0–100 scoring system (100 = very low risk; 0–20 = critical) to rank urgency and that consultants provided cost estimates only for locations scoring 60 or below.
Thornhill reported that approximately 70 percent of erosion locations were on city‑owned or city‑responsibility land, 24 percent were on private property and 6 percent on property managed by homeowners associations. The consultant’s cost estimates for the most urgent (“critical”) locations totaled just over $10 million. For the set of locations scoring at or below the consultant threshold (0–60), city‑responsibility work was estimated at roughly $91 million; staff said addressing those city locations at that scale would take about 20 years and require roughly $9 million per year (including inflation assumptions used by staff). Thornhill also noted the city’s current annual spend on erosion projects is about $2.5 million.
The presentation included examples of past repair projects and a review of how peer cities handle cost allocation; peers vary widely (some split costs for private/commercial sites, some do not). Thornhill estimated that if the full city‑responsibility portion were funded immediately, the residential average drainage fee would rise from the current average (about $5.40 per reporting metric) to an estimated $8.94 — a 65 percent increase — to generate the roughly $9 million a year needed to complete the prioritized work over 20 years.
Public commenters representing affected homeowners and homeowners associations urged the city to assume responsibility for streambank repairs that have worsened as runoff from development upstream increased. Brent Emke, president of the Hills of Indian Creek HOA, told council that runoff from roads and parking lots outside neighborhoods has increased erosion and asked the council to “place responsibility for residential stream bank maintenance and erosion control where it belongs with the city.” Other speakers cited failed retaining walls, exposed tree roots, falling trees, failed fences and a market impact when buyers back out of transactions during due diligence because of unresolved erosion and ownership ambiguity.
Council members said they want to prioritize critical sites for immediate attention and asked staff to return with policy options for cost allocation, potential funding sources, and a phased implementation plan; staff said they will present refined options to the next council for policy decisions and budgeting. No binding decision was taken at the meeting.
