Index is a town of 153 people in the Skykomish valley, tucked under steep, rocky walls. Rain comes down those walls in a hurry. Yards are small clearings, and the mountain is the neighbor on every side. Foothill drives fail where water runs down the wheel track. The rock needs a crown, a ditch, and a size that does not float away.
Snohomish County · ZIP 98256 · 2020 population 153
A drive that can take the wash
We use crushed rock that locks, and we give the water a ditch that is not the middle of the drive. Culvert crossings get cleaned or replaced if the old pipe is the reason the rock keeps disappearing.
Steep sections may need more than gravel. If the grade is a slide waiting for rain, we talk about a wall or a different route before we spread three loads that end up at the bottom.
The ground in Index
There is no subdivision playbook here. Access can be a single lane, the soil is thin over rock, and a “backyard” may be forty feet of level ground before the timber starts. Intense runoff is the design constraint. A wall has to be heavy enough to stay put, and a drain has to daylight somewhere that does not wash out the next switchback.
We keep planting short and native. Anything that needs summer water and a gardener will lose. Gravel and hardscape earn their place because they stay usable when the ground is soaked. Pruning and cleanup are how you keep the forest from taking the roof, the line of sight on the drive, and the ditch that is supposed to carry the runoff.
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
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.
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.
Refresh
Gravel is maintenance. Every few years a drive needs rock added and graded back to crown. We would rather tell you that than sell a “permanent” gravel surface. Pavers are permanent. Gravel is a good, honest, recurring surface.
More from this crew
- Gravel installation across Snohomish County
- French drain installation in Index
- Fence installation in Index
- Hardscaping in Index
- Paver installation in Index
- Gravel installation in Gold Bar
- Gravel installation in Sultan
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.
