Roseburg, Oregon: what the ground under the city is like
Roseburg sits in Douglas County, on pacific coast ranges. The soil mapped here is predominantly classified well drained — and that classification, not the rainfall total, is what decides how a basement behaves.
20% of the mapped soil area around Roseburg is wet enough that the USDA describes it as needing artificial drainage.
Linear extensibility 10.0% — very high.
Shallowest annual water table around 185 cm (6.1 ft).
Values are for Douglas County, which is what the soil survey resolves to. Full county report · soil map for a specific address.
The ground under Roseburg
Pacific Coast Ranges. Franciscan mélange and marine sediments, highly expansive clays, unstable slopes
Some of the most expansive soils in North America sit here, on some of the least stable slopes. Winter rain saturates clay-rich colluvium and it moves — which is why hillside foundation work on the California and Oregon coast is engineered rather than standardised.
When it shows up here
| Water | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ground movement | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
The opposite calendar to most of the country: the wet season runs from November to March and the summer is dry. A basement here is tested in January, not in April.
Climate pattern for this physiographic region, not a forecast for your house and not from the soil survey. It answers a question homeowners actually ask: when does this show up.
What repairs cost in Oregon
| Reference job | Modelled range |
|---|---|
| Interior drain along two walls + sump pump | $5,600–$12,050 |
| Exterior excavation of one 40 ft wall | $4,200–$12,000 |
| Underpinning on 10 piers | $16,650–$35,500 |
Regional factor for OR: ×1.11. Full cost breakdown for Oregon · run your own dimensions.
ZIP codes in Roseburg
97470, 97471
Soil does not stop at a city boundary, and neither does this data — every ZIP code above resolves to the same county soil survey. For the individual survey polygons around one address, use the soil map.
Questions about Roseburg
Is the soil the same everywhere in Roseburg?
No. These values describe Douglas County as a whole, which is the unit the soil survey publishes. Within a city, map units change over a few hundred metres — the soil map draws the actual polygons around a point and is the honest answer for one address.
Which contractor should I call in Roseburg?
We do not rank or recommend individual firms and we are not one. What this page is for is knowing which kind of work the ground here points to before anyone quotes you, and which claim to check. If you want quotes, the form below passes your request to the named networks.
Does this replace an inspection?
No. It tells you what the ground is; an inspection tells you what your building is doing on it. The useful order is: read this, print the brief for your county, then have someone look.
Get quotes in Roseburg
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