Landscaping & Hardscaping in Maple Valley, WA

Maple Valley sits at roughly 500 feet on the Cascade foothill bench, where the Cedar River drops off the plateau and runs northwest toward Renton. It was a coal and timber crossroads at Four Corners long before it incorporated in 1997, and the housing stock tells that story in layers. Small ramblers and converted cabins ring Lake Wilderness and Cherokee Bay from the 1950s through the 1970s. Timberlane filled in behind them. Then came the long build-out from roughly 1995 to 2008 that produced Rock Creek, Elk Run and most of what people picture when they think of the city: two-story production homes on quarter-acre to half-acre lots, a great many of them backing onto a greenbelt tract.

What the crew hits when it digs here is consistent. Eighteen to thirty inches of Alderwood gravelly sandy loam, then a cemented glacial till hardpan that turns a shovel into a pry bar. Near the lake and along the old outwash channels you get Everett series gravel instead, which drains beautifully and holds nothing. Down in the low ground near the wetlands and the Rock Creek drainage there is peat and gray muck, and that changes the entire approach to a patio base. On the plats built between 1998 and 2006 the topsoil is often two inches of screened dirt spread over a pad the site contractor packed with a sheepsfoot roller, with the stumps and root wads from clearing still buried underneath. We find them.

Rain is the other constant, and Maple Valley gets considerably more of it than our home yard in Kent. The valley floor runs somewhere near 40 inches a year. Out on the foothill edge toward Hobart and Ravensdale it is commonly 55 to 65, and the Cedar River watershed above town is wetter still. That extra water punishes anything built to a valley-floor standard. Patio bases that would hold fine in Burien pump and rut here. Lawns go over to moss, rush and creeping buttercup by the third winter. Infiltration trenches that took the roof tightlines silt up and start surfacing in the side yard around year eight. We build to the wetter number: more crushed base, a perimeter drain at the patio edge, and an outlet that genuinely daylights somewhere legal.

Because the lots are large and mostly wooded, requests skew toward making a sloped, shaded backyard usable again. A block wall to cut a flat pad out of the grade, steps down to it, a patio with room for a table and a fire bowl, and a fence along the greenbelt line. Deer are a real design input in Maple Valley in a way they are not in Federal Way or Burien. A new rhododendron near the Hobart edge gets browsed to sticks in a season, while sword fern, salal, evergreen huckleberry, hebe and lavender are generally left alone. Under a mature fir canopy we lean on vine maple, carex and red twig dogwood in the wet corners rather than fighting for turf that will never see four hours of sun.

The logistics are worth saying out loud. SR 169 is the only real artery into town, so we schedule block and rock deliveries in the morning instead of queuing behind the afternoon backup at Four Corners. Most Maple Valley side yards are wide enough for a mini excavator and a dump trailer, which keeps quarried basalt walls and longer block runs on the table at a sane price rather than pushing everything to wheelbarrow work. We draw the design in our own office and our own crew installs it, so the person who set the wall elevations is standing in the trench when the base course goes in.