Currenty Seaside Seawalls is installing two new steel sewalls in Pinckney, MI area.    Both seawalls are being installed with 8-guage black steel pilings, which we pile drive minimum of  4′ below the sandline (into granular conditions) with our vibratory compactor attachment on our excavator.  These two particular walls are located off of  Baseline Lake and Patterson Lake in Pinckney, MI.  Both of these properties had an existing wood seawall that had seen better days.  Water was rushing through these walls and sneaking under them, creating shoreline erosion behind them.   Each new steel seawall is roughly 24” in height, soil type is granular, and the steel pilings are at 6′ in length.  So far we hav’nt had any major issues with unforeseen buried objects generating any problems.  We did encounter an area of buried concrete approximately 6 feet landward of the black steel pilings as we were installing the deadman (tieback) i-beam steel anchors.   Instead of creating a mess and waisting time, we placed the anchors further landward and avoided the concrete burial grounds.  Longer 3/4” diameter threaded rod was then used to tie back the wall, from the  face of the angle iron to anchor.  Installing new seawalls is always an adventure, you never know what you are going to find just a few feet below grade.  You would honestly be amazed at the variety of different items people will put along their shoreline to avoid erosion, we have seen it all.

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