![Diversion and spillway tunnels at Hoover Dam - Los Angeles Public Library Photo Collection - Tessa: Photos and Digital Collections Diversion and spillway tunnels at Hoover Dam - Los Angeles Public Library Photo Collection - Tessa: Photos and Digital Collections](https://tessa2.lapl.org/digital/api/singleitem/image/photos/84461/default.jpg)
Diversion and spillway tunnels at Hoover Dam - Los Angeles Public Library Photo Collection - Tessa: Photos and Digital Collections
![Swift River at downstream portal of diversion tunnel at dam site, flood photo, Mass., Mar. 19, 1936 - Digital Commonwealth Swift River at downstream portal of diversion tunnel at dam site, flood photo, Mass., Mar. 19, 1936 - Digital Commonwealth](https://bpldcassets.blob.core.windows.net/derivatives/images/commonwealth:qr46tr251/image_access_800.jpg)
Swift River at downstream portal of diversion tunnel at dam site, flood photo, Mass., Mar. 19, 1936 - Digital Commonwealth
Inside the outer diversion tunnel of Hoover Dam, on the Arizona side, is the tunnel now empty between the iron slab in the entry gate and the concrete spillway plug? - Quora
![The completed tunnel at the intake portal of the Hoover Dam of diversion tunnel No. 4, looking toward the entrance. With the pressure grouting jumbo seen to be in operation. October 26, The completed tunnel at the intake portal of the Hoover Dam of diversion tunnel No. 4, looking toward the entrance. With the pressure grouting jumbo seen to be in operation. October 26,](https://i.redd.it/o59v5ugdonm51.jpg)
The completed tunnel at the intake portal of the Hoover Dam of diversion tunnel No. 4, looking toward the entrance. With the pressure grouting jumbo seen to be in operation. October 26,
![bioreconstruct on X: "Diversion tunnel on Nevada side of Hoover Dam. Note gate. https://t.co/jvWjGwFjZ4" / X bioreconstruct on X: "Diversion tunnel on Nevada side of Hoover Dam. Note gate. https://t.co/jvWjGwFjZ4" / X](https://pbs.twimg.com/media/DG5r-JDUMAEaYg-.jpg:large)
bioreconstruct on X: "Diversion tunnel on Nevada side of Hoover Dam. Note gate. https://t.co/jvWjGwFjZ4" / X
![File:Inlet portals of Diversion Tunnels Nos. 3 and 4 showing diversion of river flow by temporary dike shown at right.... - NARA - 293767.jpg - Wikimedia Commons File:Inlet portals of Diversion Tunnels Nos. 3 and 4 showing diversion of river flow by temporary dike shown at right.... - NARA - 293767.jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/0/06/Inlet_portals_of_Diversion_Tunnels_Nos._3_and_4_showing_diversion_of_river_flow_by_temporary_dike_shown_at_right...._-_NARA_-_293767.jpg)