News Release
NPS
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Contact: GWMP Superintendent, gwmp_superintendent@nps.gov
MCLEAN, Va. – The National Park Service (NPS) is seeking public comments on a Clara Barton Parkway Cantilever and Glen Echo Overpass Environmental Assessment (EA). The EA evaluates the potential environmental impacts from replacing the cantilever structure and adjacent retaining walls between Cabin John Parkway and the Macarthur Boulevard exit ramp, and demolishing the unused Glen Echo Overpass, an associated feature of Clara Barton Parkway.
The Federal Highway Administration (FHWA) has determined during recent inspections that the cantilever structure and adjacent retaining walls on Clara Barton Parkway are reaching the end of their useful remaining service life. The NPS will be required to implement weight restrictions on the westbound cantilevered lane as soon as 2026 if action is not taken to rehabilitate or replace the cantilever structure. Shortly thereafter, eastbound and westbound lane closures will be necessary for public safety. Recent FHWA inspections of the unused Glen Echo Overpass have similarly identified issues requiring corrective action and eventual rehabilitation if left in place.
30-day Public Comment Period: Comments on the EA will be accepted September 9, 2025 through October 9, 2025. Please go to https://parkplanning.nps.gov/clbacantilever to access the project webpage where you can view or download the EA and submit comments electronically. Comments can be submitted online until 11:59 p.m. Eastern Standard Time (EST) on October 9, 2025.
You are also welcome to mail comments postmarked by October 9, 2025 directly to:
Superintendent
Attn: Cantilever EA
700 George Washington Mem Parkway
McLean, VA 22101
Please be aware that the entire comment submitted – including personal identifying information such as address, phone number, and email address – may be made publicly available. Requests to withhold such personal identifying information from public release will be considered, but there is no guarantee that they will be withheld.
Last updated: September 2, 2025