Drainage Surfaces

The Maintenance and Operations (M&O) Surface Drainage Management section ensures that all drainage structures are maintained and in good working condition. This includes:

• Catch basins
• Culverts
• Drainage ditches
• Manholes

Drainage Section Responsibilities

• Maintenance of stormwater drainage facilities
• Managing runoff to prevent flooding, road damage
• Ditching to establish or re-establish flow lines
• Installation of temporary soil erosion and sediment control devices
• Emergency response to flooding
• Inventory of drainage facilities

 Culverts & Catch Basins

• Resetting or replacement to meet WDFW fish passage standards
• Replacement of undersized culverts that restrict flow
• Annual maintenance for debris removal and cleaning
• Compliance with state and federal permitting requirements
• Adherence to "fish windows" during maintenance activities
• Use of best management practices (BMPs) to maintain fish friendly work areas