The next part, though, is elaborate and unnecssary. Some grandiose wanna-be Nature Lover decided that it needs to have a scenic overlook (which will go on the other side of this guardrail). So now a big wide observation deck must go where we thought only a level, bikeable path over the bank needed to go.
That means the death of that beautiful old cedar in the top picture, and, worse, it means pressure-treated pilings to support the deck. Pressure-treated lumber is necessary if you have to use wooden posts. Of course. Otherwise they'd rot quickly. And while there are newer, less toxic types of pressure treatment, they are lower-rated, and suitable only for residential use. To live outdoors in salt water, the rating must be 2.5 (explained in this article -- see the green box and below), and that means CCA (chromated copper arsenate. Yes, that is arsenic).
At the very least, we could have required some other material be used. None are very good, rammed into this precious creek, but pressure-treatment means slow leach of poison into the water when the tide comes up.
Woulda coulda shoulda, again. From now on, we'll have to be vigilant about any project, even one that seems as blasted nature-friendly as a bike path.