Outfall Repair & Rehabilitation

Before: Broken concrete, After: stone step pools

Storm drain pipes end at outfalls, where water leaves the pipe and enters local streams. Over time, runoff can create erosion and the outfall infrastructure can degrade or break. Outfall rehabilitation projects repair the infrastructure and stabilize steep slopes.

Outfall infrastructure condition is evaluated as part of Arlington's stream assessments. By reducing erosion near streams, outfall repair projects also help fulfill the water quality requirements of the Stormwater Permit issued to Arlington County by Virginia Department of Environmental Quality.

Project goals can typically include:

  • Create a stable outfall
  • Maintain the storm sewer infrastructure
  • Repair erosion
  • Remove invasive plants.


Projects in Design

  • Donaldson Run Headwaters – Construction in Summer 2023
  • Monroe St near 36th St N Outfall to Gulf Branch – Construction in Fall 2023
  • 26th St N Outfall near Potomac Overlook Regional Park – Temporary repair in 2019.  Full repair in Fall, 2023
  • Donaldson Run near N. Utah Street/Tributary A stream repair – Construction Fall/Winter 2023
  • Quebec St near N. Randolph St Outfall to Rixey Branch – Construction in Fall 2023
  • Palisades Outfall near 25th St N (Emergency Repair) – Design
  • S Kensington St & 5th Rd S Outfall to Upper Long Branch – Pre-Design
  • Gulf Branch "Reach 4" Outfall near N Peary St – Pre-Design
  • Gulf Branch "Reach 5" Outfall near N Nelson St – Pre-Design


Completed Projects

Some of the outfall stabilization projects Arlington has completed include:

  • Woodrow Street near N Vernon St – Outfall to Donaldson Run (2022)
  • N Randolph Street near Chain Bridge – Outfall to Pimmit Run (2022)
  • Windy Run Outfall (2018)