Several Bethesda and D.C. residents who live near the Potomac River inside the Beltway are reporting that they hear a loud, low humming sound during the night in recent months. There have been other nighttime noise mysteries from time to time in that area since the 1980s. Some would attribute them to secret goings-on at intelligence and military facilities in Sumner or Carderock.
While we can't definitively declare the current mystery solved, there's a possibility this particular noise may not require the attention of Fox Mulder. Since late summer, National Park Service contractors have been repaving Clara Barton Parkway. This work was to begin at Carderock and work its way in towards the District line by the end of the year.
The noise described does sound consistent with that heard in the River Road corridor when it was repaved about three years ago. Long, low humming and growling noises. At a distance, or inside structures, the sound may not immediately bring roadway resurfacing to mind.
Topographical factors may enhance the noise in this case. Clara Barton Parkway runs below neighborhoods at the bottom of a steep drop-off from homes located above it along MacArthur Boulevard. So the noise is going to refract off of the higher elevations on either side of the Potomac, and in the quiet of night, be even more noticeable.
Keep the reports coming in, however, in case the Mothman of West Virginia has relocated to our suburbs.
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