Mountlake Terrace is mid-century houses on city lots, with newer buildings near the transit line. The slopes are gentle, the soils are compacted, and the yards were not designed for the amount of roof water a remodels-worth of downspouts can dump. Tight access and clay. Gravel is often the right surface because water can get through it, but only if the base is open and the edges are held.
Snohomish County · ZIP 98043 · 2020 population 21,272
The side yard and the parking pad
We use it for side paths, under gates, and for a pad where a full paver drive is more than the yard needs. Fabric, compacted base, a restrained edge against the lawn. Without the edge, you mow rocks forever.
Permeable is not the same as “dumped and forgotten.” The surface still needs weed maintenance. We can refresh it. We cannot make it zero work.
The ground in Mountlake Terrace
Lots are modest. A patio, a small lawn, a side yard that has become a moss strip, and a fence that is older than the owners. That is the usual visit. The soil has been walked on for sixty years. Aeration and dethatching change the lawn more than a bag of seed thrown on top.
Where the lot tips, it tips a little, and a low wall or a re-graded swale is enough. We are not cutting roads into a mountain. Pavers get people off the mud by the back door, and a pressure wash takes the black film off a walk that has not seen sun all winter. Plantings should stay in scale with the house. A hedgerow that needs a lift every year is the wrong tree for a forty-foot lot.
How we do the work
Gravel stays put when it has a compacted base, a fabric or a separation from the clay, a slight crown or a cross slope, and an edge. A load of rock dumped on the grass is a mud pit by spring. We dig out the soft soil, build the base, and top it with the rock you actually walk and drive on.
The top rock is not the same as the base rock. Base is angular and locks. The surface might be smaller crushed rock or a cleaner gravel, depending on whether this is a drive, a dog run, or a path.
What we look at first
- Cars, foot traffic, or both
- How soft the ground is in March
- Where the water crosses the drive today
- An edge against lawn or beds so the rock does not migrate
Edges and weeds
Steel, timber, or a paved border on a walking path. On a farm drive, the ditch is the edge. Weeds in gravel get pulled or treated early, before the root is a shrub. A thick, clean surface grows fewer of them than a dirty thin one.
Base rock and top rock
The base is larger, angular, and compacted in lifts until it stops moving under the machine. The top is smaller and thick enough to cover, not thick enough to rut into piles. One material dumped once is not a drive section.
Fabric
Separation fabric keeps clay from pumping up. It is not weed magic, and it is not a substitute for digging out the mud. We lap it and we cover it. Sun-baked fabric at the edge means the gravel was spread too thin.
More from this crew
- Gravel installation across Snohomish County
- French drain installation in Mountlake Terrace
- Fence installation in Mountlake Terrace
- Hardscaping in Mountlake Terrace
- Paver installation in Mountlake Terrace
- Gravel installation in Lynnwood
- Gravel installation in Edmonds
- Gravel installation in Brier
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.
