This path is probably not for cyclists. Not sure path close to the road continues here. Survey.

What is this thing? Remains of an old pier?

Park now has a picnic shelter, and a trail east then south meeting Williams Lane.

Public GPS Traces shows route from here to west then south.

Strava has trail from here north to where the stream meets Yankee Girl Circle

Strava heat map has a route from here northeast to Toe Jam & Country Club.

Strava heat map has a route from here south west to trail

From aerial imagery there are three structures here, each on piles. Maybe current navigational things, or ruins of things from Port Blakely Mill.

ridewithgps heatmap shows riders a bit north of the mapped trail. survey.

Strava heat map shows a trail from here southeast to the retention pond.