A shoreline that is losing material is telling you something specific, and the repair only works if you read it correctly. We are regularly called to shorelines where good money has already been spent on a wall or a scatter of rip-rap that failed within a few seasons — not because the work was poor, but because it treated the wrong mechanism.
There are three, and they leave different signatures.
1. Wave and wake erosion
Signature: undercutting at the waterline. A notch cut into the bank at the level the water works, with intact material above it that eventually collapses into the gap. Material graded away and sorted — fines gone, coarse left behind.
Cause: energy delivered at the waterline, repeatedly. On Lake George that is wind-driven wave action on exposed shorelines — the broad water south of Bolton Landing gives wind a long fetch — plus boat wake, which in high-traffic areas is the dominant input through the summer.
What actually stops it: toe protection. Properly sized stone, keyed into the bank below the working level, so the energy is dissipated where it arrives rather than at the top of the bank.
The common failure is a scatter of rip-rap placed on top of the existing grade, sized by what was available rather than by the energy it has to absorb. Wave action removes the fines from underneath it, the stone settles into the void, and within two seasons you have an expensive pile of rock sitting in the notch that is still growing behind it.
2. Surface runoff
Signature: rills and channels running down the bank. Deposition fans at the bottom. Material loss concentrated in lines rather than spread evenly. Often worst directly below a driveway, a roof downspout, a path, or a lawn that sheds rather than absorbs.
Cause: water arriving from uphill with energy and nowhere to go but down the face of the bank.
What actually stops it: intercepting and managing the water before it reaches the bank. Swales, drainage, permeable surfaces, planting that slows and absorbs. Changing the grade so water spreads rather than concentrates.
This is the mechanism most commonly misdiagnosed, and the misdiagnosis is expensive: a retaining wall built against a runoff problem gets undermined from behind. The water does not stop arriving because you built something in front of it. It goes around, or under, and takes the wall's bedding with it.
If your shoreline problem is runoff, the fix is mostly uphill of the shoreline.
3. Ice push
Signature: material shoved up the bank rather than washed down it. Ridges and berms of pushed stone. Structures rotated or displaced shoreward. Damage that appears between autumn and spring with nothing having happened in between.
Cause: the ice sheet. Water expands roughly 9% on freezing, so a frozen bay is under compression and presses outward against the shore. Then thermal cycling ratchets it — expanding on warm days, contracting on cold nights without pulling back what it moved — so across a winter the shoreline is worked progressively shoreward.
What actually stops it: mass, and a graded transition that lets the ice ride up rather than presenting a face for it to push against. Large, well-keyed stone. A slope the ice can climb. Structures with enough weight and footprint that moving them is not worth the sheet's trouble.
What does not work is a vertical face made of components small enough to be moved individually. Ice will take them one at a time.
The fourth thing: crib settlement
Not strictly shoreline erosion, but it presents alongside it and is worth including.
Timber cribs supporting docks and boathouses settle over decades. They lose stone through gaps that open as timbers shrink and rot; they spread as the fill pushes outward against weakening members; and they are ratcheted by ice like everything else.
Signature: a structure out of level. Stone from inside the crib now lying on the bottom beside it. A gap opening between the pier and the shore. Doors binding on a boathouse.
What fixes it: jacking and supporting the structure, rebuilding or replacing the failed crib members, re-stoning with properly graded fill, and setting it back down true. Where timbers have failed — and sills below the waterline usually go first — replacement rather than repair.
Reading your own shoreline
Walk it and ask three questions.
- Where is the material going? Down and away means water. Up the bank means ice. Into a notch at the waterline means waves.
- Is the loss even or concentrated? Even suggests wave energy along the whole face. Concentrated in lines suggests runoff. Concentrated in one area suggests a local cause — a downspout, a path, a change in exposure.
- When did it change? Damage that appeared over a winter is ice. Damage that grows through the summer is wake and runoff. Damage that has been slow for a decade is probably all three.
Most Lake George shorelines that are actively failing have at least two mechanisms running, which is precisely why single-mechanism repairs disappoint. A wall that would have handled the waves gets undermined by the runoff. Toe stone that would have handled the wake gets pushed up the bank by the ice.
Doing it properly
Shoreline work on Lake George is regulated, and rightly so — this is a drinking-water lake whose clarity is its defining asset and is not guaranteed.
Expect the Lake George Park Commission to be involved where structures are concerned, NYS DEC under Protection of Waters where the bed or bank is disturbed, potentially the US Army Corps of Engineers where fill is placed in navigable water, the Adirondack Park Agency given the Park context, and your town for the building permit.
It also means doing the work with proper containment, staging material where the next rain will not carry it into the lake, and finishing with planting and grading that keeps working after we leave. That last part is not decoration. Vegetation is the cheapest and most durable erosion control available, and a shoreline project that ends with bare soil has not finished.
Lake George Docks
We design, permit and build docks, boathouses, cribs and shoreline structures across all 32 miles of Lake George, New York — and repair what the lake does to them. Questions about your own shoreline? Call (518) 260-9878 or send us the details.
