Upstream North Dumbarton Street Culvert Replacement

Public Notice

Arlington County Department of Environmental Services is accepting comments on the project to replace the upstream culvert that carries Little Pimmit Run under N Dumbarton St. from October 3, 2025 to October 24, 2025 (more details below under engagement)

Location

3777 North Dumbarton Street,    View Map

Status

In Design

Project Background 

The existing culverts that carry Little Pimmit Run under North Dumbarton St have reached the end of their useful life and are in need of replacement.  The culverts are also undersized for the location and sometimes Little Pimmit Run stream overflows the top of the culverts.  The new culverts will be an open span arch design to better allow flow through the culvert.  The culvert replacement project aims to provide a long-term solution for the residents of North Dumbarton Street, improving their quality of life and reducing the risk of flood damage to properties. Furthermore, the project will contribute to the overall health and sustainability of the Little Run stream and watershed. Both the upstream and downstream culverts will be replaced.  

The Federal Emergency Management Agency (FEMA) floodplains have also been analyzed to ensure the most effective flood mitigation strategies are implemented.

Project Tasks 

• Replace the existing upstream metal culvert (12'Wx8'Hx40'L) with a proposed precast concrete arch culvert (27'Wx9.4'Hx40.1'L).
• Install stone riprap along the eroding areas of the channel upstream to prevent further erosion.
• Install a proposed storm drain inlet near property # 3777, connected to the stream with a 15-inch concrete pipe to improve drainage issues.
• Relocate the existing water main and gas lines along N Dumbarton Street to accommodate the new culvert placement.
• Stabilize the surrounding areas affected by construction to minimize environmental impact and ensure a safe environment for residents.

Project Plans 

Upstream Culvert 

• Existing Conditions Upstream Culvert(PDF, 2MB)
• Plan and Profile Upstream Culvert(PDF, 2MB)
• Final Plans Upstream Culvert(PDF, 60MB)

Environmental Documents 

• Cultural Resources Review(PDF, 2MB)
• Threatened and Endangered Species Review(PDF, 8MB)
• Park and Recreational Lands Review(PDF, 12MB)
• Army Corps of Engineers Nationwide Permit(PDF, 243KB)

 

Project Schedule

Project Design - 2023-2025

Construction start  - Estimated Fall, 2026 (depends on VDOT approvals).  Construction is estimated to last 6-12 months.

Project Engagement 

Event Date	Event Type	Meeting Materials
May 1, 2023, 6 PM	Community Meeting	Meeting Presentation(PDF, 21MB)    Meeting video
2024-2025	Meetings with adjacent property owners
October 3-24, 2025	Public Notice Project Comment Period(PDF, 842KB)