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- Hennepin_Island_tunnel abstract "Hennepin Island tunnel was a 2,500-foot (760 m)-long underground passage in Saint Anthony, Minnesota (now Minneapolis) dug beneath the Mississippi River riverbed between 1868 and 1869 to create a downstream spillway for hydro plants, milling and lumber business located upstream of St. Anthony Falls. The tunnel ran downstream from Nicollet Island, beneath Hennepin Island, and exited below St. Anthony Falls.During construction of the tunnel, on October 5, 1869, the river broke through the thin layer of limestone separating the river's bed from the tunnel. The rushing river scoured the tunnel, caving in parts of Hennepin Island and causing the earth supporting St. Anthony Falls to collapse upstream. There was serious concern that the riverbed would crumble and reduce St. Anthony Falls to a long set of rapids. However, within a few weeks, dams were built to divert the river and stop St. Anthony Falls from being washed away. The fix was temporary as the 1870 spring floods damaged some of the new dams and swept away more of Hennepin Island. By the fall of 1870, the riverbed and banks were stabilized and a wooden apron capped St. Anthony Falls to stop the upstream progression of the collapsing falls. As a direct result of the collapse of the Hennepin Island tunnel, St. Anthony Falls ultimately received a sloping concrete apron to create an artificial falls that are held out as the only major waterfall on the Mississippi River.The site of the tunnel is about a mile upstream from the 2007 collapse of the I-35W Mississippi River bridge.".
- Hennepin_Island_tunnel thumbnail Hennepin_Island_Tunnel_collapse_1.JPG?width=300.
- Hennepin_Island_tunnel wikiPageID "12581045".
- Hennepin_Island_tunnel wikiPageRevisionID "590869618".
- Hennepin_Island_tunnel after Meeker_Island_Lock_and_Dam.
- Hennepin_Island_tunnel before "—".
- Hennepin_Island_tunnel hasPhotoCollection Hennepin_Island_tunnel.
- Hennepin_Island_tunnel subject Category:Buildings_and_structures_in_Minneapolis,_Minnesota.
- Hennepin_Island_tunnel subject Category:Disasters_in_Minnesota.
- Hennepin_Island_tunnel subject Category:Mississippi_River_locks.
- Hennepin_Island_tunnel subject Category:Tunnels_completed_in_1869.
- Hennepin_Island_tunnel subject Category:Tunnels_in_Minnesota.
- Hennepin_Island_tunnel subject Category:Water_tunnels.
- Hennepin_Island_tunnel point "44.9825 -93.25611111111111".
- Hennepin_Island_tunnel type Artifact100021939.
- Hennepin_Island_tunnel type Object100002684.
- Hennepin_Island_tunnel type Passage103895293.
- Hennepin_Island_tunnel type Passageway103895585.
- Hennepin_Island_tunnel type PhysicalEntity100001930.
- Hennepin_Island_tunnel type Tunnel104497962.
- Hennepin_Island_tunnel type TunnelsCompletedIn1869.
- Hennepin_Island_tunnel type TunnelsInMinnesota.
- Hennepin_Island_tunnel type WaterTunnels.
- Hennepin_Island_tunnel type Way104564698.
- Hennepin_Island_tunnel type Whole100003553.
- Hennepin_Island_tunnel type YagoGeoEntity.
- Hennepin_Island_tunnel type YagoPermanentlyLocatedEntity.
- Hennepin_Island_tunnel type SpatialThing.
- Hennepin_Island_tunnel comment "Hennepin Island tunnel was a 2,500-foot (760 m)-long underground passage in Saint Anthony, Minnesota (now Minneapolis) dug beneath the Mississippi River riverbed between 1868 and 1869 to create a downstream spillway for hydro plants, milling and lumber business located upstream of St. Anthony Falls. The tunnel ran downstream from Nicollet Island, beneath Hennepin Island, and exited below St.".
- Hennepin_Island_tunnel label "Hennepin Island tunnel".
- Hennepin_Island_tunnel label "Hennepin-Island-Tunnel".
- Hennepin_Island_tunnel sameAs Hennepin-Island-Tunnel.
- Hennepin_Island_tunnel sameAs m.02wwnk2.
- Hennepin_Island_tunnel sameAs Q1605371.
- Hennepin_Island_tunnel sameAs Q1605371.
- Hennepin_Island_tunnel sameAs Hennepin_Island_tunnel.
- Hennepin_Island_tunnel lat "44.9825".
- Hennepin_Island_tunnel long "-93.25611111111111".
- Hennepin_Island_tunnel wasDerivedFrom Hennepin_Island_tunnel?oldid=590869618.
- Hennepin_Island_tunnel depiction Hennepin_Island_Tunnel_collapse_1.JPG.
- Hennepin_Island_tunnel isPrimaryTopicOf Hennepin_Island_tunnel.