Mill Swamp Mitigation Banking
Ecological Restoration to Mill Swamp and Unnamed Tributary
In accordance with Maryland Environment Article 18-101(C)(1–2), JMT is required to issue a public notice upon reaching 30% design completion and to hold a public meeting at 60% design completion. This project was publicly announced through both the Maryland Department of the Environment (MDE) and the U.S. Army Corps of Engineers. A public hearing, hosted by MDE, took place on April 7, 2025.
About the Mill Swamp Mitigation Bank Project:
The Mill Swamp Mitigation Bank is an environmental restoration effort in Charles County, Maryland. The project focuses on restoring streams and wetlands, specifically improving the health of Mill Swamp and a nearby unnamed tributary, starting just downstream of Marshall Hall Road and covering about 3,573 feet of stream.
These waterways are part of the Atlantic Coastal Plain and drain areas of approximately 2.5 to 2.8 square miles. They are protected for recreational use and aquatic life, which means no construction work in the stream is allowed from March 1 to June 15 to safeguard wildlife during sensitive seasons.
U.S. Army Corps of Engineers (USACE)
Baltimore District
Project #: NAB-2022-61353
Maryland Department of the Environment (MDE)
Project #: 22-NT-0001/202261353
Agency Interest (AI) #: 175986
What the Project Will Do:
The main goals of the project are to:
- Reduce flooding and protect nearby infrastructure
- Improve water quality
- Restore natural habitats for plants and animals
To achieve this, the team will reshape the stream and surrounding areas, remove loose and nutrient-rich soil, and restore natural flow patterns. These changes will help stabilize stream banks, reduce erosion, and improve how the land filters nutrients.
The design also encourages better interaction between groundwater and surface water, which helps maintain water levels during dry periods and keeps temperatures stable—both important for supporting aquatic life. New stream shapes and habitat features will help increase biodiversity in the water.
Environmental Protections:
- No paved surfaces will be added, so stormwater systems are not needed.
- Strict erosion and sediment controls will be in place throughout the project.
Questions? Contact Catherine Hoy at choy@jmt.com or call 443-212-7152.
Public Meeting
A community meeting about the Mill Swamp Mitigation Bank Project was held on December 10, 2025.
Meeting Recording:
Meeting Notes and Resources:
Mill Swamp Mitigation Bank Public Meeting Presentation
Mill Swamp Stream Restoration Authorization Checklist
Mill Swamp MB DRAFT 60% Design Report
