Triad-Day Mountain Bridge, Spanning Park Loop Road at Triad-Day Mountain Pass, Seal Harbor, Hancock County, ME

Significance: This structure provides a grade separation between the Park Loop Road and the Day Mountain Carriage Road, allowing carriage road users to cross the busy park motor road in safety. The stone-faced reinforced concrete structure is typical of bridges employed in the late 1930s extension of the Park Loop Road.

Unprocessed Field note material exists for this structure: N350

Survey number: HAER ME-46

Building/structure dates: 1941 Initial Construction

concrete arch bridges transportation bridge construction carriages seal harbor triad day bridge triad day mountain bridge loop park loop road pass triad day mountain pass harbor hancock hancock county maine robert de revere leo grossman historic american engineering record thomas m lawrence philip mabel arthur w mcfarland richard h quin john d rockefeller h j spelman thomas c vint inc w h hinman photo ultra high resolution high resolution library of congress

1969 - 1980

Library of Congress

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