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A recent update of a certain flight simulator made me revisit this chart and I had not noticed the lines of triangles (at the Chain Bridge / Roosevelt Bridge etc, but not at the Key Bridge) in a past version, years ago. What are they? I couldn't find the information in the FAA Chart User's Guide.

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So, applying some local knowledge, the Key Bridge is a high arch bridge in that it is a good distance above the water level, and the other ones listed, Rochambeau, Memorial , Roosevelt, and Chain Bridge are all "low" bridges, more like causeways.

I tried looking for a chart legend that said this, but I wasn't able to find one.

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They represent the bridges. You can use the bridges to gauge where to be on your approach.

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    $\begingroup$ As the Q notes, the Key Bridge doesn’t have them. What’s different about the bridges that do? $\endgroup$
    – StephenS
    Jan 14 at 5:00

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