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    Wie alt sind die Brücken Ihres Landkreises? Durchschnittliches Alter von US -Brücken zugeordnet [OC]
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    Wie alt sind die Brücken Ihres Landkreises? Durchschnittliches Alter von US -Brücken zugeordnet [OC]

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    1. TreeFruitSpecialist on

      [OC] This map shows the median bridge age by county in the United States, based on the 2025 National Bridge Inventory, which includes 743,398 bridges. Only structures longer than 20 feet that meet federal criteria are included. Additional information for what qualifies in this dataset can be found in previous posts:

      [Concrete vs. Steel pt. 2](https://www.reddit.com/r/dataisbeautiful/comments/1m9yz8w/comment/n5aqx96/?utm_source=share&utm_medium=web3x&utm_name=web3xcss&utm_term=1&utm_content=share_button)

      [Concrete vs. Steel pt. 1](https://www.reddit.com/r/dataisbeautiful/comments/1m9adn7/steel_vs_concrete_what_are_americas_bridges/?utm_source=share&utm_medium=web3x&utm_name=web3xcss&utm_term=1&utm_content=share_button)

      Each county’s value represents the median construction year of its qualifying bridges. Gray counties indicate either missing data or no qualifying bridges.

      The interactive map has tooltips that have the number of bridges, median age, year of first bridge and newest bridge by county. [Interactive map](https://www.datawrapper.de/_/8qRq7/)

      I processed the data in R and visualized the results in Datawrapper.

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