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Sammamish Town Center (not licensed)

Stormwater Pipe Inspection, Assessment & Rehabilitation Program

Public Works

Associate Stormwater Engineer

Jayden Abrams
(425) 295 0551

🌧️ Program Overview

Protecting Our Watersheds Through Proactive Maintenance

The City of Sammamish maintains a complex stormwater network that protects public safety and local waterways. In 2022, the City Council adopted the 2023–2028 Capital Improvement Plan, launching the Storm Pipe Rehabilitation Program — a data-driven effort to identify, inspect, and address aging or at-risk stormwater pipes.

📊 Stormwater System At a Glance 

  • 235 miles of pipe

  • 64 miles of ditches

  • 12,000+ catch basins

  • 484 public & 144 private stormwater facilities


🎯 Program Goals

  • Evaluate the condition of stormwater pipes using CCTV inspections

  • Identify and prioritize pipes for repair, rehabilitation, or replacement

  • Support risk-based asset management using standardized scoring systems

  • Maintain the performance of the City’s stormwater system over the long term


🛠️ Key Benefits

  • Prevents pipe failures and sinkholes

  • Reduces flood risk and backups

  • Improves maintenance planning and budgeting

  • Protects Sammamish’s lakes, streams, and critical areas

  • long term


Scope of Inspection

  • Included:

    • Stormwater conveyance pipes and culverts

    • Pipe segments 8 inches to 48 inches in diameter

    • Prioritized by size, age, and material

  • Excluded:

    • Pipes under 8 inches

    • Detention structures

    • Phantom flow/minor drain types