2024 40 USC 8127 – Part of Washington Aqueduct for playground purposes

2023 40 USC 8127 – Part of Washington Aqueduct for playground purposes

2022 40 USC 8127 – Part of Washington Aqueduct for playground purposes

2021 40 USC 8127 – Part of Washington Aqueduct for playground purposes

2020 40 USC 8127 – Part of Washington Aqueduct for playground purposes

2018 40 USC 8127 – Part of Washington Aqueduct for playground purposes

2017 40 USC 8127 – Part of Washington Aqueduct for playground purposes

2015 40 USC 8127 – Part of Washington Aqueduct for playground purposes

2014 40 USC 8127 – Part of Washington Aqueduct for playground purposes

2013 40 USC 8127 – Part of Washington Aqueduct for playground purposes

2012 40 USC 8127 – Part of Washington Aqueduct for playground purposes

2010 40 USC 8127 – Part of Washington Aqueduct for playground purposes