Other · 2026
Mill Swamp Mitigation Bank
Bryans Road, MD · near Maryland (4.0 mi)
What this outcome means
The FAA studied the proposal and concluded it would not be a hazard to air navigation. A no-hazard determination is not permanent — it carries an expiration date, and if the structure is not built by then the case has to be re-filed.
The proposal, in the filer's words
"The proposed Mill Swamp Mitigation Bank design is built on extensive environmental assessments to guide the creation of a stable stream and floodplain system that mimics historic pre disturbance conditions. Using Maryland IRT approved methods and a modified Rosgen/floodplain restoration approach tailored to the coastal plain the design focuses on restoring natural hydrology sediment balance and ecological function. Key goals include creating a low gradient frequently connected floodplain; establishing diverse wetland habitats; reducing flow velocities; increasing channel complexity; and preserving existing forest stands while using native soils woody material and microtopography to build a resilient system. Wood structures hydric soils native vegetation and small tributaries all work together to enhance habitat promote carbon sequestration and support long-term geomorphic stability.\nWetland and stream features are designed as an integrated system where water moves freely between the channel and floodplain creating shallow emergent habitats diverse pools and hyporheic exchange. The design emphasizes reusing onsite materials avoiding stone armoring and constructing wetlands that quickly establish hydric soils and native vegetation. Coarse woody debris log structures and restored zero order channels add habitat complexity and improve ecological processes such as nutrient cycling and sediment deposition. This work supports development of a mitigation bank a large-scale ecological restoration site that generates environmental “credits” which can be purchased to offset unavoidable impacts elsewhere ensuring no net loss of natural resources while restoring high quality stream and wetland functions on the project site.\nIt should be noted that no above grade structures or open water features are proposed."
Filing details
- Case number (ASN)
- 2026-AEA-2643-OE
- Structure
- Mill Swamp Mitigation Bank
- Type
- Other
- Category
- Other
- Height above ground
- 1 ft
- Height above sea level
- 34 ft
- Site elevation
- 33 ft
- Notice of
- New Construction
- Duration
- Permanent
- Marking & lighting
- —
Timeline
- Filed
- February 24, 2026
- Determined
- April 13, 2026
- Determination expires
- October 13, 2027
A determination that lapses before the structure is built has to be re-filed. The FAA does not send a reminder.
Who filed it
- Sponsor
- Johnson, Mirmiran, & Thompson, Inc.
- Representative
- Johnson, Mirmiran, & Thompson, Inc.
Names are shown as they appear in the FAA's public record. How we handle names
Location
- Coordinates
- 38.654694, -77.080772
- Degrees / minutes / seconds
- 38°39'16.9"N 77°04'50.8"W
- County
- Charles
- Open in a map
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Other filings within 5 miles
Organisation-sponsored 2026 filings whose coordinates sit near this one.
About this record
This page is a readable copy of a public record published by the FAA's Obstruction Evaluation / Airport Airspace Analysis system. It is not the official record and may lag it. For the authoritative case status, search this ASN at the FAA's OE/AAA portal. If something here is wrong, email support@idea-engine.studio and we will correct it.
Source: FAA Obstruction Evaluation / Airport Airspace Analysis (OE/AAA) public archive (oeaaa.faa.gov), data as of September 12, 2026. Compiled by LOS Analyzer (Idea Engine LLC). This is not an official FAA record or an FAA determination; the FAA's portal is authoritative. LOS Analyzer is not affiliated with or endorsed by the FAA.
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