Walnut Creek Gravel Wetland

We installed a gravel wetland at Walnut Creek Wetland Park. The wetland includes an underground gravel reservoir that will slow down and filter stormwater runoff and plant roots that will soak up and clean the water.

GSI Address: 1005 Peterson St, Raleigh, NC 27610

Project Details

Type:: Stormwater
Budget:: $350,000 (design & construction)
Project Lead:: Stormwater Management
Contractors:: Hazen and Sawyer (Design); Lanier Construction Company (Contractor)

We installed a gravel wetland at Walnut Creek Wetland Park! The 5,300-square-foot wetland captures stormwater runoff coming from Peterson Street and other nearby streets, sidewalks, and buildings. The area will prevent about 8 pounds of excess nitrogen and 135 pounds of suspended solids from polluting waterways each year.

NCDEQ Stormwater Control Measure Approval

From March 2024 to August 2025, North Carolina State University (NCSU) studied the gravel wetland and found it reduces flooding and improves water quality like other stormwater control measure (SCM) in NC. NCSU researchers are studying other gravel wetlands across the state and will present findings to the NC Department of Environmental Quality (NCDEQ) once they have gathered enough data. If NCDEQ agrees, the gravel wetlands will become an approved SCM type for statewide use.

GSI Visual Monitoring

Green stormwater infrastructure (GSI) is designed to grow and change throughout the lifetime of a project. We need your help monitoring how they're looking and functioning! Learn more about the visual monitoring program.

How It Works

Visit the gravel wetland, place your phone on the monitoring stand, snap a quick photo, and upload with our GSI Visual Monitoring Form.
You can see other uploaded photos on the GSI Monitoring Dashboard!