I can't find direct evidence at their federal level, but their British Columbia Premier did mention targeting US's 'red States' for their liquor stores. https://www.cbc.ca/news/canada/british-columbia/bc-premier-david-eby-us-tariffs-1.7448307
Looking at the list, it does seem to be mostly agricultural goods and manufactured goods, which do mostly come from Trump-supporting areas.
The dams are entirely the responsibility of the Army Corps of Engineers, and the US President is the commander-in-chief.
The only ways for this to not happen is for the President to have their mind changed, or the President is removed from office, or, the order is refused enough (at cost of being fired/court-martialed) that nobody will carry them out.
The great powers of the US Presidency is meant to expedite government action. We are currently far from the scenario where Congress, by the will of the US voters, will remove the current President.