A 1979 survey report documented 69 obstructions to navigation, and sought the opinions of twenty interested parties to present the Forth and Clyde Local (Subject) Plan in 1980.
1979年的一份调查报告记录了69个航行障碍，并征求了20个有关方面的意见，于1980年提出了福斯和克莱德地方（主体）计划。