Good landscaping in Kalama, WA is mostly about gravity. The town sits on a narrow floodplain along the Columbia, and its residential areas climb the hill to the east and the cliffs above town, parts of which have sweeping views over the river. Almost every view comes with a slope, and almost every slope comes with water moving through it in winter.
Our Woodland base is one short hop down I-5, about 10 minutes, so Kalama jobs get the same attention as the ones next door. We build terraced retaining walls, slope drainage, patios set where the view is, and planting plans that frame the river instead of hiding it. Call (360) 555-0142 any hour.
Kalama's Hillside Lots Above the Columbia
Kalama is a small city, about 3,170 people in the state's April 2026 estimate, but it covers a lot of vertical ground. The Port of Kalama and industrial sites hold the riverfront, the business district sits on the east side of I-5, and the Kalama River meets the Columbia just outside the city limits. Three I-5 exits, 27, 30 and 32, serve the town.
Up the hill, Craftsman and mid-century houses share the slopes with view homes off roads such as Green Mountain Road and Varsity Road, and rural places spread up Kalama River Road. History runs deep here: St. Joseph's Catholic Parish was built in 1874, the Montgomery House in 1908, and Kalama served as the Cowlitz County seat from 1872 to 1922.
That mix means two kinds of hillside jobs:
- Older homes: deciding which old walls, steps and shrubs to keep and which to rebuild.
- View homes: usable flat space, a slope that stays put, and nothing growing into the sightline.
Basalt, Clay Subsoil and Perched Water: What Is Under a Kalama Slope
USDA soil maps of the Kalama hillsides show Schneider-Rock outcrop complex on 15 to 65 percent slopes, with basalt bedrock 40 to more than 60 inches down. Around it are Olympic silt loam, a well-drained soil with a reddish clay subsoil weathered from basalt, plus Mart, Hazeldell and Sara silt loams. The Kalama soil series, described from this area, carries a perched water table 2.5 to 5 feet down from December through March.
In practice that means:
- Rock close to the surface on the steepest lots, so wall footings and planting holes can hit stone.
- Water moving sideways in winter along the clay subsoil, coming out as seeps on cut banks and wet faces on old walls.
- More rain the higher you go. The NOAA station at Kalama Falls Hatchery, about 5 miles up the valley, averages 67.81 inches a year, against 48.12 inches at Longview on the river. Where your lot sits between those two shapes how much water the slope has to handle.
The region has seen what saturated hillsides can do: the Aldercrest-Banyon slide in Kelso began moving in 1998 after years of above-average rain and cost more than $70 million. That is why water is the first design question on any Kalama hillside.
Keeping the River View: Walls, Planting and Lighting on Kalama View Lots
A view lot is designed from the window out. Our approach on Kalama hillsides:
- Terrace instead of one tall wall. Two or three shorter segmental block walls with planting shelves between them drain more easily and look lighter from below. Closely spaced terraces load each other, so spacing, engineering and permits get checked with the City of Kalama or Cowlitz County on every job.
- Drain every retaining wall. Pipe, rock and fabric behind the block, and an outlet that does not dump onto the slope below.
- Plant low on the downhill side. Kinnikinnick, salal, low Oregon grape and dwarf conifers stay under eye level at maturity. Taller trees go to the sides to frame the river.
- Prune for the view, do not top. Limbing up and selective thinning keep the river in sight for years.
- Light the path, not the sky. Shielded path and step lights and soft uplighting on one feature tree, so the river and the Oregon shore stay visible at night. See landscape lighting.
- Put the patio where the view is. A paver or gravel patio cut into the slope with a seat wall, like the fire pit patio with a valley view in our photos, gives you a flat place to sit and look out.
