Retaining walls in North Yarmouth, Maine.
Most of North Yarmouth is level to gently rolling, which is why the places that are not tend to need walls. The 2018 Comprehensive Plan describes elevations running from about 60 feet where Pratt's Brook leaves town to 400 to 440 feet at the top of Walnut Hill, with moderately steep to steep ground on stream banks, along the Royal River, and on the uplands of Walnut Hill and Wescustogo Hill.
We build granite veneer walls, natural boulder walls and geogrid-reinforced segmental block walls, and on these sites the drainage behind the wall matters more than the face.
Suffield silt on the dissected slopes
NRCS maps Suffield silt loam across several of the town's side slopes, including units described as eroded and running from 8 to 15 percent and from 25 to 45 percent. The official series description explains why: Suffield is silt loam over a silty clay layer, formed in lake or marine sediments, sitting on the sides of ridges in dissected plains. Water moves through the upper silt and stalls on the clay, which is the setup for a wall that bulges after a wet spring.
Walls on that kind of cut get clean crushed-stone backfill, a perforated drain at the heel daylighted downhill, and filter fabric between the stone and the native silt so fines do not clog it. Taller block walls get geogrid tied back into the slope rather than relying on the face alone.
Walls as the permanent fix the ordinance asks for
North Yarmouth's shoreland performance standards require a written erosion and sedimentation plan for permitted filling and grading, and they name retaining walls and riprap as permanent stabilization. The same section says exposed ground must be stabilized within one week of last being worked and permanently within nine months. On a riverbank lot, a wall is often the piece that lets the rest of the site close out on time.
Where a wall sits within 100 feet of the Royal River, Chandler Brook, the East Branch or Knight's Pond, the ordinance also limits clearing: no opening in the canopy larger than 250 square feet, and ground cover under three feet left in place. Wall layouts near water are drawn to work around existing trees rather than through them, and the Code Enforcement Officer sees the plan first.
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 North Yarmouth, Maine.
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