Soil series profile

Lapine soil series

Lapine is a excessively drained soil with a paragravelly ashy coarse sandy loam surface, mapped on 697,782 acres in 3 counties in OR. Hydrologic group A.

#334 by mapped area ashy-pumiceous Xeric Vitricryands (Andisols)

Drainage class: Excessively drained
Hydrologic group: A
Typical topsoil pH: 6.4
Mapped area: 698k

Typical Lapine profile

Texture and pH by depth

Depth to scale. More strongly shaded layers hold more clay. Horizon names are the soil survey's (A = topsoil, B = subsoil, C = parent material).

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Typical Lapine horizons (representative values)
Depth	Texture	pH	Clay	Sand	Organic matter
0–1 in (Oi)	Slightly decomposed plant material	5.0	Not reported	Not reported	75%
1–1 in (Oe)	Moderately decomposed plant material	5.0	Not reported	Not reported	75%
1–3 in (A)	Paragravelly ashy coarse sandy loam	6.4	5%	65%	5%
3–12 in (BA)	Paragravelly ashy coarse sandy loam	6.2	5%	70%	2.5%
12–29 in (Bw1)	Extremely paragravelly ashy coarse sand	6.2	5%	88%	1.5%
29–43 in (Bw2)	Very paragravelly ashy coarse sand	6.4	5%	90%	0.5%
43–59 in (C)	Paragravelly ashy coarse sand	6.4	5%	90%	0.5%
59–79 in (2Bw3)	Ashy sandy loam	6.6	10%	65%	0.5%

Representative values from the most extensive Lapine map unit (Lapine paragravelly ashy coarse sandy loam, 2 to 12 percent slopes, survey area OR683). Other map units of this series vary within the series range.

Stock photo for illustration, not a sample of this soil series. Credit on the Sources & method page.

What this means

What Lapine soil means for gardens, lawns and septic systems

For gardens

Typical topsoil in Lapine soils is slightly acidic: pH 6.4 (most land between 6.3 and 6.5), the range most vegetables, flowers and lawn grasses prefer.

Loamy topsoil (loam, silt loam and similar) covers 72% of mapped Lapine acres: generally the easiest soil to garden, holding moisture without staying waterlogged. The most common surface texture is paragravelly ashy coarse sandy loam (72% of mapped Lapine acres).

100% of mapped Lapine acres is excessively or somewhat excessively drained: water moves through fast, so gardens need more frequent watering in dry spells.

For lawns and yards

100% of mapped acres is in hydrologic group A, where water soaks in fast. Lawns there dry out quickly; deeper, less frequent watering and organic matter help.

For a septic system

For conventional septic absorption fields, NRCS rates 92% of the acres in mapped Lapine soils very limited, 9% somewhat limited and 0% not limited.

Where the soil is very limited (slow permeability, a high water table, flooding, shallow bedrock or steep slopes), alternative systems such as mound or sand-filter designs are common and cost more.

Only a licensed site evaluation or perc test at the actual lot decides whether a system is allowed and which design.

Generated from the mapped numbers above using fixed rules, not a site visit. See how these notes are written.

Where Lapine soil is found

Mapped acres

Lapine is mapped in Oregon.

Counties with the most mapped Lapine soil
County	Acres	Share of county land
Klamath County, OR	676,823	23.5%
Deschutes County, OR	10,071	0.5%
Lake County, OR	5	0.0%

Septic absorption fields

NRCS rating, share of Lapine acres

Not limited 0%

Somewhat limited 9%

Very limited 92%

Septic tank absorption field rating across mapped Lapine acres. Scale 0 to 100% of mapped land.

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Septic tank absorption field rating across mapped Lapine acres.
Category	Share of acres
Not limited	0.0%
Somewhat limited	8.5%
Very limited	91.5%

Drainage, water table and flooding

Share of Lapine acres

Depth to seasonal high water table: None reported within about 6.5 feet (median where reported).
Flooding: Not mapped as flooding on most acres.
Slope: Typically 3–23% (median 7%).
Topsoil organic matter: Median 5%.

Drainage class

Excessively drained 100%

Somewhat excessively drained 0%

Well drained 0%

Moderately well drained 0%

Somewhat poorly drained 0%

Poorly drained 0%

Very poorly drained 0%

Drainage class across mapped Lapine acres. Scale 0 to 100% of mapped land.

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Drainage class across mapped Lapine acres.
Category	Share of acres
Excessively drained	100.0%
Somewhat excessively drained	0.0%
Well drained	0.0%
Moderately well drained	0.0%
Somewhat poorly drained	0.0%
Poorly drained	0.0%
Very poorly drained	0.0%

Hydrologic soil group

A: fast infiltration (mostly sandy or gravelly) 100%

B: moderate infiltration 0%

C: slow infiltration 0%

D: very slow infiltration (clayey, shallow or wet) 0%

A/D: D as is, A if drained 0%

B/D: D as is, B if drained 0%

C/D: D as is, C if drained 0%

Hydrologic soil group across mapped Lapine acres. Scale 0 to 100% of mapped land.

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Hydrologic soil group across mapped Lapine acres.
Category	Share of acres
A: fast infiltration (mostly sandy or gravelly)	100.0%
B: moderate infiltration	0.0%
C: slow infiltration	0.0%
D: very slow infiltration (clayey, shallow or wet)	0.0%
A/D: D as is, A if drained	0.0%
B/D: D as is, B if drained	0.0%
C/D: D as is, C if drained	0.0%

Sources & data dates

Source: USDA NRCS Soil Survey Geographic Database (SSURGO), queried through Soil Data Access. Public domain.
Data date: SSURGO as published on November 3, 2026 (most recent survey area update October 26, 2026). NRCS refreshes SSURGO each October.
Scope: All map unit components named Lapine (component kind "Series") in SSURGO: 697,782 acres.
Method: Shares are by mapped acres of Lapine components. The profile comes from the single largest Lapine component. Full methodology.

Independent reference site. No government affiliation or endorsement.

Full narrative description: USDA Official Soil Series Description for Lapine.