{"nrhp_refnum":"74001437","name":"Detroit-Superior High Level Bridge","other_names":[],"category":"structure","location":{"address":"Over Cuyahoga River Valley, between Detroit Ave. and Superior Ave.","address_restricted":false,"city":"Cleveland","county":"Cuyahoga County","state":"OH","lat":41.494199114000025,"lon":-81.70235762599998,"geom_source":"nps_gis"},"listed_date":"1974-01-18","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Engineering","Transportation"],"significance_levels":["local"],"summary":{"what_it_is":"A double-deck arched concrete and steel bridge carrying roadways across the Cuyahoga River Valley in central Cleveland, Ohio, between Detroit Avenue and Superior Avenue. It was completed in 1917 and designed by county engineers.","why_significant":"When completed in 1917 it was the largest double-deck reinforced concrete bridge in the world. It helped unify a city divided by the river valley. Its design shows functional simplicity and an excellent expression of the reinforced concrete technology of its time, with a long central steel span that was remarkable for its date.","narrative":"Spanning the Cuyahoga River Valley between Detroit Avenue and Superior Avenue, this double-deck bridge links the two halves of central Cleveland. It is 2,656 feet long, or 3,112 feet with approaches, and its roadways rest on twelve reinforced concrete arches anchored in four large concrete piers. The central span over the river hangs from a steel arch 591 feet wide and 196 feet above the water. Completed in 1917 and designed by county engineers A. B. Lea and Frank R. Lander, it cost $5,407,000. The upper level carried road traffic and the lower level streetcars, the first of which crossed on December 24, 1917. At completion it was the largest double-deck reinforced concrete bridge in the world, and it helped unify a city divided by the valley. Its design is valued for functional simplicity and as an expression of contemporary concrete technology. A 1967 widening added a lane on each side, leaving six lanes on the upper roadway.","period_of_significance":"20th Century; specific dates 1917, 1967","architect_builder":"A. B. Lea and Frank R. Lander, county engineers","architectural_style":null,"criteria":[],"status_note":"Listed in excellent condition and altered; in 1967 an additional lane was added on each side, so the upper roadway carries six lanes of modern traffic. Marked occupied and open to the public without restriction, with transportation as its use.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:53:10.218662-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_OH/74001437.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/74001437/8f075530ac-800.webp","url_1600":"https://nationalhistoricalregister.com/media/74001437/8f075530ac-1600.webp","licence":"CC BY-SA 4.0","author":"Michael Barera","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Cleveland_August_2015_24_(Detroit%E2%80%93Superior_Bridge).jpg\" rel=\"noopener\">Michael Barera</a>, <a href=\"https://creativecommons.org/licenses/by-sa/4.0\" rel=\"license noopener\">CC BY-SA 4.0</a>, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Cleveland_August_2015_24_(Detroit%E2%80%93Superior_Bridge).jpg"},"district":{"nrhp_refnum":"13001117","name":"Cleveland Centre Historic District","url":"https://nationalhistoricalregister.com/districts/ohio/cleveland-centre-historic-district-13001117/"},"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71987877","wikipedia":"https://en.wikipedia.org/wiki/Detroit%E2%80%93Superior_Bridge","wikidata":"https://www.wikidata.org/wiki/Q2493242"},"indexable":true,"url":"https://nationalhistoricalregister.com/ohio/cuyahoga-county/detroit-superior-high-level-bridge-74001437/"}