The casting basin where sections of tube tunnels were cast in concrete then floated to the Fort Point Channel to be sunk. - DRS
Aerial view of the casting basin where sections of tube tunnels were cast in concrete then floated to the Fort Point Channel to be sunk. - DRS
![Port of Grays Harbor applies for grant to repurpose former 520 pontoon casting site | The Daily World Port of Grays Harbor applies for grant to repurpose former 520 pontoon casting site | The Daily World](https://www.thedailyworld.com/wp-content/uploads/2021/10/26793895_web1_PontoonBasinGrant-ADW-211013-basin_2.jpg)
Port of Grays Harbor applies for grant to repurpose former 520 pontoon casting site | The Daily World
![The casting basin is located at the mouth of the Chehalis River along Grays Harbor, with close proximity to the Pacific Ocean. The sluice gate pictured here allows water to fill the The casting basin is located at the mouth of the Chehalis River along Grays Harbor, with close proximity to the Pacific Ocean. The sluice gate pictured here allows water to fill the](https://l450v.alamy.com/450v/kk7p38/the-casting-basin-is-located-at-the-mouth-of-the-chehalis-river-along-kk7p38.jpg)