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- Seventh_Street_Improvement_Arches abstract "The Seventh Street Improvement Arches are a double-arched masonry highway bridge that formerly spanned the St. Paul and Duluth Railroad tracks in St. Paul, Minnesota. The Seventh Street Improvement Arches are historically significant for its rarity and the technically demanding nature of its skewed, helicoidal spiral, stone-arch design. The bridge is one of the few of its type in the United States, and is the only known bridge of its type in Minnesota. It was built in 1883-1884 by Michael O’Brien and McArthur Brothers of Chicago and was designed by William A. Truesdell. The bridge was listed on the National Register of Historic Places in 1989 and on the American Society of Civil Engineers Historic Civil Engineering Landmarks in 2000.The bridge was proposed in 1883 as part of a group of improvements along Seventh Street, linking downtown St. Paul with the Dayton's Bluff neighborhood on the east. Other parts of this project included a 300-foot iron bridge crossing the Northern Pacific Railway, a long embankment, and a stone-arch sewer for the crossing of Phalen Creek. These improvements were necessary because the hill on Seventh Street needed to be rebuilt to lessen its steepness, so streetcars could travel between downtown and the Dayton's Bluff neighborhood. The Seventh Street Improvement Arches bridge posed a special engineering challenge because the street crossed the St. Paul and Duluth tracks at a 63-degree angle. The bridge also had to carry sewer and water pipes and match the rest of the profile of the regraded hill, making a substantial amount of fill necessary. This precluded the construction of a bridge with ribbed arches, because this method could not support all the weight of the fill. Truesdell also considered using the classical French method of skewed arch construction, but the amount of skilled stonecutting necessary would have made the cost prohibitive. He turned to the helicoidal or spiral method, introduced by British architect Peter Nicholson in 1828. This method was mathematically rigorous, but since Truesdell studied mathematics as a hobby, he decided to accept the challenge. The voussoir stones were cut with curved surfaces to form a series of parallel spiral courses. The initial calculation of the curves was difficult, but once the calculation was performed, all of the voussoirs (except for the ring stones) could be cut from the same pattern. This required the stonecutters to work with more precision than they were used to, but a skilled foreman helped to organize the work. The abutments, piers, and wing walls were built with a variety of gray limestone locally quarried in St. Paul, while the voussoirs, ring stones, coping and spandrel walls were built with a buff-colored limestone quarried in Kasota, Minnesota.Construction on the bridge began in September 1883, with Michael O'Brien of St. Paul doing general contracting for excavation, foundation, and abutments. McArthur Brothers of Chicago was responsible for the final construction of the bridge, which opened for traffic on December 18, 1884. Truesdell's engineering colleagues recognized his achievements, even if the general public soon forgot the significance of the bridge. The Association of Engineering Societies Journal characterized the bridge as \"the most important piece of masonry in the city\" upon his death in 1909.The railroad tracks have since been removed, but the bridge still stands. Today, the Bruce Vento Regional Trail follows the former railroad line under the bridge.".
- Seventh_Street_Improvement_Arches bridgeCarries "Four lanes of(East Seventh Street)".
- Seventh_Street_Improvement_Arches locatedInArea Saint_Paul,_Minnesota.
- Seventh_Street_Improvement_Arches mainspan "12.4968".
- Seventh_Street_Improvement_Arches openingYear "1884".
- Seventh_Street_Improvement_Arches thumbnail SeventhStreetArches1.jpg?width=300.
- Seventh_Street_Improvement_Arches type Arch_bridge.
- Seventh_Street_Improvement_Arches type Helicoid.
- Seventh_Street_Improvement_Arches width "37.7952".
- Seventh_Street_Improvement_Arches wikiPageID "4751945".
- Seventh_Street_Improvement_Arches wikiPageLength "7162".
- Seventh_Street_Improvement_Arches wikiPageOutDegree "29".
- Seventh_Street_Improvement_Arches wikiPageRevisionID "697349182".
- Seventh_Street_Improvement_Arches wikiPageWikiLink American_Society_of_Civil_Engineers.
- Seventh_Street_Improvement_Arches wikiPageWikiLink Arch_bridge.
- Seventh_Street_Improvement_Arches wikiPageWikiLink Bruce_Vento_Regional_Trail.
- Seventh_Street_Improvement_Arches wikiPageWikiLink Category:Bridges_completed_in_1884.
- Seventh_Street_Improvement_Arches wikiPageWikiLink Category:Bridges_in_Saint_Paul,_Minnesota.
- Seventh_Street_Improvement_Arches wikiPageWikiLink Category:Bridges_on_the_National_Register_of_Historic_Places_in_Minnesota.
- Seventh_Street_Improvement_Arches wikiPageWikiLink Category:Deck_arch_bridges.
- Seventh_Street_Improvement_Arches wikiPageWikiLink Category:Historic_Civil_Engineering_Landmarks.
- Seventh_Street_Improvement_Arches wikiPageWikiLink Category:National_Register_of_Historic_Places_in_Saint_Paul,_Minnesota.
- Seventh_Street_Improvement_Arches wikiPageWikiLink Category:Railway_bridges_on_the_National_Register_of_Historic_Places.
- Seventh_Street_Improvement_Arches wikiPageWikiLink Category:Road_bridges_in_Minnesota.
- Seventh_Street_Improvement_Arches wikiPageWikiLink Category:Skew_bridges.
- Seventh_Street_Improvement_Arches wikiPageWikiLink Category:Stone_bridges_in_the_United_States.
- Seventh_Street_Improvement_Arches wikiPageWikiLink Helicoid.
- Seventh_Street_Improvement_Arches wikiPageWikiLink Kasota,_Minnesota.
- Seventh_Street_Improvement_Arches wikiPageWikiLink Limestone.
- Seventh_Street_Improvement_Arches wikiPageWikiLink Minnesota.
- Seventh_Street_Improvement_Arches wikiPageWikiLink National_Register_of_Historic_Places.
- Seventh_Street_Improvement_Arches wikiPageWikiLink Northern_Pacific_Railway.
- Seventh_Street_Improvement_Arches wikiPageWikiLink Peter_Nicholson_(architect).
- Seventh_Street_Improvement_Arches wikiPageWikiLink Saint_Paul,_Minnesota.
- Seventh_Street_Improvement_Arches wikiPageWikiLink Skew_arch.
- Seventh_Street_Improvement_Arches wikiPageWikiLink St._Paul_and_Duluth_Railroad.
- Seventh_Street_Improvement_Arches wikiPageWikiLink Tram.
- Seventh_Street_Improvement_Arches wikiPageWikiLink Voussoir.
- Seventh_Street_Improvement_Arches wikiPageWikiLink William_A._Truesdell.
- Seventh_Street_Improvement_Arches wikiPageWikiLinkText "Seventh Street Improvement Arches".
- Seventh_Street_Improvement_Arches bridgeName "Seventh Street Improvement Arches".
- Seventh_Street_Improvement_Arches caption "A view of the Seventh Street Improvement Arches from the north side. The asphalt trail is the Bruce Vento Regional Trail.".
- Seventh_Street_Improvement_Arches carries "Four lanes of".
- Seventh_Street_Improvement_Arches crosses "Former trackage of St. Paul and Duluth Railroad".
- Seventh_Street_Improvement_Arches design "Skewed, helicoidal, double stone arch bridge".
- Seventh_Street_Improvement_Arches locale Saint_Paul,_Minnesota.
- Seventh_Street_Improvement_Arches mainspan "41".
- Seventh_Street_Improvement_Arches open "1884".
- Seventh_Street_Improvement_Arches width "124.0".
- Seventh_Street_Improvement_Arches wikiPageUsesTemplate Template:Coord.
- Seventh_Street_Improvement_Arches wikiPageUsesTemplate Template:Infobox_Bridge.
- Seventh_Street_Improvement_Arches wikiPageUsesTemplate Template:Jct.
- Seventh_Street_Improvement_Arches wikiPageUsesTemplate Template:Reflist.
- Seventh_Street_Improvement_Arches wikiPageUsesTemplate Template:Registered_Historic_Places.
- Seventh_Street_Improvement_Arches subject Category:Bridges_completed_in_1884.
- Seventh_Street_Improvement_Arches subject Category:Bridges_in_Saint_Paul,_Minnesota.
- Seventh_Street_Improvement_Arches subject Category:Bridges_on_the_National_Register_of_Historic_Places_in_Minnesota.
- Seventh_Street_Improvement_Arches subject Category:Deck_arch_bridges.
- Seventh_Street_Improvement_Arches subject Category:Historic_Civil_Engineering_Landmarks.
- Seventh_Street_Improvement_Arches subject Category:National_Register_of_Historic_Places_in_Saint_Paul,_Minnesota.
- Seventh_Street_Improvement_Arches subject Category:Railway_bridges_on_the_National_Register_of_Historic_Places.
- Seventh_Street_Improvement_Arches subject Category:Road_bridges_in_Minnesota.
- Seventh_Street_Improvement_Arches subject Category:Skew_bridges.
- Seventh_Street_Improvement_Arches subject Category:Stone_bridges_in_the_United_States.
- Seventh_Street_Improvement_Arches hypernym Bridge.
- Seventh_Street_Improvement_Arches point "44.95641944444444 -93.07726111111111".
- Seventh_Street_Improvement_Arches type ArchitecturalStructure.
- Seventh_Street_Improvement_Arches type Bridge.
- Seventh_Street_Improvement_Arches type Infrastructure.
- Seventh_Street_Improvement_Arches type Place.
- Seventh_Street_Improvement_Arches type RouteOfTransportation.
- Seventh_Street_Improvement_Arches type Location.
- Seventh_Street_Improvement_Arches type Place.
- Seventh_Street_Improvement_Arches type Thing.
- Seventh_Street_Improvement_Arches type SpatialThing.
- Seventh_Street_Improvement_Arches type Q12280.
- Seventh_Street_Improvement_Arches comment "The Seventh Street Improvement Arches are a double-arched masonry highway bridge that formerly spanned the St. Paul and Duluth Railroad tracks in St. Paul, Minnesota. The Seventh Street Improvement Arches are historically significant for its rarity and the technically demanding nature of its skewed, helicoidal spiral, stone-arch design. The bridge is one of the few of its type in the United States, and is the only known bridge of its type in Minnesota.".
- Seventh_Street_Improvement_Arches label "Seventh Street Improvement Arches".
- Seventh_Street_Improvement_Arches sameAs Q7457747.
- Seventh_Street_Improvement_Arches sameAs m.0clft9.
- Seventh_Street_Improvement_Arches sameAs Q7457747.
- Seventh_Street_Improvement_Arches lat "44.95641944444444".
- Seventh_Street_Improvement_Arches long "-93.07726111111111".
- Seventh_Street_Improvement_Arches wasDerivedFrom Seventh_Street_Improvement_Arches?oldid=697349182.
- Seventh_Street_Improvement_Arches depiction SeventhStreetArches1.jpg.
- Seventh_Street_Improvement_Arches isPrimaryTopicOf Seventh_Street_Improvement_Arches.
- Seventh_Street_Improvement_Arches name "Seventh Street Improvement Arches".