The following underwater videos were taken about 10 years ago. They show dead and dying zones in the St. Croix River Estuary adjacent to Bayside Port and Quarry. The cause? Probably a combination of local quarry activities and a 10 year period where the pulp mill in Woodland dumped highly toxic black liquor into the river.
Odds are this was never acted upon and was ignored by all levels of government.
1. The "normal" look of the bottom where currents prevent sedimentation,
2. Intermediate sedimentation with active recolonization by mud-dwelling invertebrates.
3. Virtually "dead" bottom covered by sediment.