The closest equivalent in the United States would be the U.S. highway system.
With very rare exceptions (such as County Route 537), the 500 series follows the rule of cardinal direction used for Interstate Highways and U.S. Routes: even-numbered roads run east and west, while odd-numbered roads run north and south.
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East–west routes tend to be numbered with the lowest numbers in the northern part of the state and the highest numbers in the southern part of the state, also like the Interstate Highways and U.S. Routes.
In anticipation of the formation of the United States Highway System in 1926, the Highway Department commissioned the construction of a steel truss bridge just downstream from the dam.
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