The lake is the point of the town, and it is also the drainage problem. Shoreline lots shed water toward the water, banks erode where wakes and winter rain meet a soft edge, and inland yards stay damp because the water table and the clay do not let a storm leave quickly. We build the wall that holds the yard. We do not build a bulkhead in the lake. Those are different permits and a different trade, and we will not blur them.
Snohomish County · ZIP 98258 · 2020 population 34,385
A wall at the top of the bank, not in the water
The useful wall is set back, holding the lawn and the patio, with drainage that does not pipe soil down the bank. Native planting below the wall does the work a sod slope cannot. If the erosion is at the waterline, we tell you who you actually need.
Height is usually modest. The mistake is a heavy wall with no drain, loading a wet bank that was already creeping.
The ground in Lake Stevens
On the water, the work is the bank and the view. A retaining edge, native shoreline plants such as red osier dogwood, and a rain garden or a drain that slows runoff before it hits the lake do more for the property than a strip of sod at the top of an eroding slope. Fertilizer and bare soil washing into the lake are how a nice lawn becomes a neighbor problem.
Off the water, in the newer neighborhoods, the soils were compacted during construction and the lawns were rolled out on top. They look fine in July and sour in February. Aeration, a real topdressing, and getting the downspouts away from the foundation are the unglamorous jobs that keep those yards from turning to moss. Patios here are for the view. We build the base as if it will be wet half the year, because it will.
How we do the work
A retaining wall is a structure. The part you see is the block, the boulder, or the timber. The part that keeps it standing is the base, the batter or the geogrid, and the drain rock behind it. We do not stack block on the sod and call it a wall.
Height decides everything. A low garden wall and a wall holding a drive are not the same detail, the same permit, or the same price. We measure the retained dirt, not the face you wish it were.
What we look at first
- Retained height, at the tallest point
- What is above the wall: a lawn, a drive, a house
- Water coming down the slope
- Access for block or for boulders
The base
Compacted rock, buried enough that the first course is not sitting in the organic layer. A wall is not a stack. If the base is soft, we dig out and replace it. There is no fabric or foam that fixes a bad base.
What changes the price
Height, length, access, how much soil we have to move, and whether the wall holds a car or a flower bed. We measure those. A per-foot number shouted from the sidewalk ignores the tallest bay, which is the bay that costs the money.
Drainage is part of the wall
Rock behind the face, a pipe at the heel, and an outlet you can see. Weep holes alone, stuffed with the native clay, are not a drain. This is the step that gets skipped on walls that lean.
More from this crew
- Retaining walls across Snohomish County
- Rock walls in Lake Stevens
- French drain installation in Lake Stevens
- Hardscaping in Lake Stevens
- Patio installation in Lake Stevens
- Retaining walls in Everett
- Retaining walls in Marysville
- Retaining walls in Snohomish
Sources for the climate and the water
- USDA plant hardiness map for choosing plants that can take a Snohomish County winter.
- EPA WaterSense on watering less once a lawn or a new planting is established.
- EPA Soak Up the Rain on keeping roof and yard water from becoming someone else’s problem.
