![File:Looking upstream into Black Canyon toward Hoover Dam site showing outlet portals of four diversion tunnels and... - NARA - 293789.jpg - Wikimedia Commons File:Looking upstream into Black Canyon toward Hoover Dam site showing outlet portals of four diversion tunnels and... - NARA - 293789.jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/thumb/5/5e/Looking_upstream_into_Black_Canyon_toward_Hoover_Dam_site_showing_outlet_portals_of_four_diversion_tunnels_and..._-_NARA_-_293789.jpg/1200px-Looking_upstream_into_Black_Canyon_toward_Hoover_Dam_site_showing_outlet_portals_of_four_diversion_tunnels_and..._-_NARA_-_293789.jpg)
File:Looking upstream into Black Canyon toward Hoover Dam site showing outlet portals of four diversion tunnels and... - NARA - 293789.jpg - Wikimedia Commons
![File:Looking upstream toward Boulder dam site showing outlet portals of all four diversion tunnels. Flow of Colorado... - NARA - 293890.jpg - Wikimedia Commons File:Looking upstream toward Boulder dam site showing outlet portals of all four diversion tunnels. Flow of Colorado... - NARA - 293890.jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/4/45/Looking_upstream_toward_Boulder_dam_site_showing_outlet_portals_of_all_four_diversion_tunnels._Flow_of_Colorado..._-_NARA_-_293890.jpg)
File:Looking upstream toward Boulder dam site showing outlet portals of all four diversion tunnels. Flow of Colorado... - NARA - 293890.jpg - Wikimedia Commons
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![Boulder Canyon Outlet portal of diversion tunnel No. 2 showing Stoney gate steel in place above portal and form work for concrete super-structure.; Scope and content: Photograph from Volume Two of a Boulder Canyon Outlet portal of diversion tunnel No. 2 showing Stoney gate steel in place above portal and form work for concrete super-structure.; Scope and content: Photograph from Volume Two of a](https://c8.alamy.com/comp/W5K66X/boulder-canyon-outlet-portal-of-diversion-tunnel-no-2-showing-stoney-gate-steel-in-place-above-portal-and-form-work-for-concrete-super-structure-scope-and-content-photograph-from-volume-two-of-a-series-of-photo-albums-documenting-the-construction-of-hoover-dam-boulder-city-nevada-W5K66X.jpg)
Boulder Canyon Outlet portal of diversion tunnel No. 2 showing Stoney gate steel in place above portal and form work for concrete super-structure.; Scope and content: Photograph from Volume Two of a
![Plan view of final layout employed for Hoover Dam, diversion tunnels,... | Download Scientific Diagram Plan view of final layout employed for Hoover Dam, diversion tunnels,... | Download Scientific Diagram](https://www.researchgate.net/publication/269084499/figure/fig1/AS:641367885762568@1529925428617/Plan-view-of-final-layout-employed-for-Hoover-Dam-diversion-tunnels-spillways-outlet.png)