Soil series profile
Adena soil series
Adena is a well drained soil with a loam surface, mapped on 157,069 acres in 14 counties in CO. Hydrologic group C.
- Drainage class
- Well drained 100% of mapped acres
- Hydrologic group
- C 100% of mapped acres
- Typical topsoil pH
- 7.2 neutral · range 7.2–7.2
- Mapped area
- 157k acres in 14 counties, 1 state
Typical Adena profile
Texture and pH by depth
Show as a table
| Depth | Texture | pH | Clay | Sand | Organic matter |
|---|---|---|---|---|---|
| 0–4 in (H1) | Loam | 7.2 | 21% | 42% | 2% |
| 4–22 in (H2) | Silty clay loam | 7.2 | 31% | 20% | 0.75% |
| 22–60 in (H3) | Silt loam | 7.9 | 21% | 26% | 0.25% |
What this means
What Adena soil means for gardens, lawns and septic systems
For gardens
Typical topsoil in Adena soils is neutral: pH 7.2, the range most vegetables, flowers and lawn grasses prefer.
Loamy topsoil (loam, silt loam and similar) covers 100% of mapped Adena acres: generally the easiest soil to garden, holding moisture without staying waterlogged. The most common surface texture is loam (84% of mapped Adena acres).
100% of mapped Adena acres is moderately well to excessively drained, which suits most garden plants.
For lawns and yards
On 100% of mapped acres, rain soaks in slowly (hydrologic groups C and D, including dual groups that are D until drained). Expect runoff and puddles after heavy rain: core-aerate compacted lawns and keep ground sloping away from foundations.
For a septic system
For conventional septic absorption fields, NRCS rates <1% of the acres in mapped Adena soils very limited, >99% somewhat limited and 0% not limited.
Only a licensed site evaluation or perc test at the actual lot decides whether a system is allowed and which design.
Where Adena soil is found
Mapped acres
Adena is mapped in Colorado.
| County | Acres | Share of county land |
|---|---|---|
| Adams County, CO | 73,358 | 9.6% |
| Arapahoe County, CO | 26,565 | 5.1% |
| Washington County, CO | 13,622 | 0.8% |
| Weld County, CO | 11,393 | 0.4% |
| Morgan County, CO | 8,770 | 1.1% |
| Lincoln County, CO | 5,980 | 0.4% |
| Pueblo County, CO | 5,425 | 0.4% |
| Elbert County, CO | 4,253 | 0.4% |
| Logan County, CO | 2,614 | 0.2% |
| Kit Carson County, CO | 2,467 | 0.2% |
| Denver County, CO | 1,390 | 1.4% |
| Cheyenne County, CO | 559 | 0.0% |
| Larimer County, CO | 356 | 0.0% |
| Boulder County, CO | 279 | 0.1% |
Septic absorption fields
NRCS rating, share of Adena acres
Show as a table
| Category | Share of acres |
|---|---|
| Not limited | 0.0% |
| Somewhat limited | 99.9% |
| Very limited | 0.1% |
Drainage, water table and flooding
Share of Adena 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 2–6% (median 3%).
- Topsoil organic matter
- Median 2%.
Drainage class
Show as a table
| Category | Share of acres |
|---|---|
| Excessively drained | 0.0% |
| Somewhat excessively drained | 0.0% |
| Well drained | 100.0% |
| Moderately well drained | 0.0% |
| Somewhat poorly drained | 0.0% |
| Poorly drained | 0.0% |
| Very poorly drained | 0.0% |
Hydrologic soil group
Show as a table
| Category | Share of acres |
|---|---|
| A: fast infiltration (mostly sandy or gravelly) | 0.0% |
| B: moderate infiltration | 0.0% |
| C: slow infiltration | 100.0% |
| 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 Adena (component kind "Series") in SSURGO: 157,069 acres.
- Method
- Shares are by mapped acres of Adena components. The profile comes from the single largest Adena component. Full methodology.