Although one of the highest bridges in the United States, exactly how high the main span is above ground is unclear. When it was placed on the
National Register of Historic Places in 1967, this distance was cited as over the
Rio Grande. Today, that number is still widely used. However, in 2010, the Highest Bridges Web Site came out with a substantially lower () figure. Wikipedia used this figure in 2012 when updating its
List of bridges in the United States by height, but kept the figure for the bridge in its
Rio Grande del Norte National Monument article. In 2015, a height of appeared on the scene. An author of a bridge book noted this discrepancy and recommended this compromise number be used until the matter was authoritatively resolved. This height figure then cropped up in a January 2016 Materials Performance Magazine white paper about the bridge's then just completed inspection by the
New Mexico Department of Transportation. ==In popular culture==