Retaining walls in Yarmouth, Maine.
Most of Yarmouth is gentle ground. The highest point, York Hill on the Cumberland line, stands only 226 feet above sea level. The exceptions are sharp, though, and they are where retaining walls get built: the deep ravines near Route 88 west of I-295, the slopes around Pratt's Brook, and the banks above the Royal and Cousins river estuaries. The 2024 comprehensive plan notes that some of those areas are zoned Resource Protection, and it flags slopes above 15 percent as increasingly hard to build on.
Coastal bluffs mapped by the state
The Maine Geological Survey has mapped 27.4 miles of coastal bluff along Yarmouth's shore. About 61 percent rates as stable. The rest does not: 7.9 miles are classed as unstable and 2.8 miles as highly unstable, concentrated on the north and south tips of Cousins Island, eastern Moshier Island, the west shore of Little Moshier and sections south of the Royal River estuary such as White Cove. The plan adds that 80 percent of that shoreline was last mapped in 2002.
A bluff is sediment, not ledge, so a wall near one is not simply stacking stone at the toe. Where a wall is appropriate at all, it is set back from the edge, drained from behind so groundwater does not build pressure, and paired with planting that holds the slope face.
Zoning matters here too. Parts of these slopes sit in the Resource Protection District, where Chapter 701 sets a 250-foot structure setback of its own, so the district lines on the town map are confirmed before any wall is designed.
Clay subsoil and the permit side
Behind a wall, Yarmouth's common silt loams are the problem soil. The Suffield series drains well near the surface but sits over a silty clay substratum that moves water slowly. Our walls, whether granite veneer, natural boulder or segmental block, go in with a compacted footing below the frost-heave zone, clean crushed stone behind the face and a perforated drain that daylights downhill.
Inside the Shoreland Overlay District, Chapter 701 lists retaining walls among the permanent stabilization structures an erosion and sedimentation control plan can call for, and any filling, grading or excavation there that needs a permit also needs that written plan. Public Works requires a minor site plan once imported fill exceeds 100 cubic yards and a major one above 1,000, which matters when a terraced wall is backfilled to create a flat lawn.
Granite · Boulder · Block
How we handle retaining walls
Whether it is a granite veneer entry wall with lantern pillars, a terraced boulder slope or a structural block wall behind a new build, we engineer for drainage and frost so the wall you pay for once stands for decades.
See the full retaining walls service page or everything we do in Yarmouth, Maine.
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