Soil series profile
Lucky Star soil series
Lucky Star is a well drained soil with a silt loam surface, mapped on 189,538 acres in 14 counties across 3 states. Hydrologic group B.
- Drainage class
- Well drained 95% of mapped acres
- Hydrologic group
- B 85% of mapped acres
- Typical topsoil pH
- 6.7 neutral · range 6.3–7.0
- Mapped area
- 190k acres in 14 counties, 3 states
Typical Lucky Star profile
Texture and pH by depth
Show as a table
| Depth | Texture | pH | Clay | Sand | Organic matter |
|---|---|---|---|---|---|
| 0–6 in (A11) | Silt loam | 7.0 | 19% | 27% | 6.5% |
| 6–19 in (A12) | Gravelly silt loam | 7.0 | 19% | 27% | 6.5% |
| 19–34 in (A21) | Very gravelly loam | 6.3 | 15% | 44% | 0.75% |
| 34–47 in (A22) | Very gravelly sandy loam | 6.3 | 13% | 67% | 0.75% |
| 47–58 in (A&B) | Extremely gravelly loam | 6.3 | 23% | 40% | 0.75% |
| 58–74 in (A&B2) | Extremely gravelly sandy loam | 6.3 | 15% | 66% | 0.75% |
What this means
What Lucky Star soil means for gardens, lawns and septic systems
For gardens
Typical topsoil in Lucky Star soils is neutral: pH 6.7 (most land between 6.3 and 7.0), the range most vegetables, flowers and lawn grasses prefer.
Loamy topsoil (loam, silt loam and similar) covers 96% of mapped Lucky Star acres: generally the easiest soil to garden, holding moisture without staying waterlogged. The most common surface texture is silt loam (45% of mapped Lucky Star acres).
96% of mapped Lucky Star acres is moderately well to excessively drained, which suits most garden plants.
For lawns and yards
Most land is in hydrologic groups B and C, where rain soaks in at a moderate pace.
For a septic system
For conventional septic absorption fields, NRCS rates 94% of the acres in mapped Lucky Star soils very limited, 2% somewhat limited and 0% not limited (4% not rated, such as urban land, pits or water).
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.
Where Lucky Star soil is found
Mapped acres
Lucky Star is mapped in Utah, Idaho and Wyoming.
| County | Acres | Share of county land |
|---|---|---|
| Morgan County, UT | 42,600 | 10.9% |
| Summit County, UT | 33,902 | 4.8% |
| Weber County, UT | 31,753 | 9.3% |
| Cache County, UT | 28,800 | 5.7% |
| Rich County, UT | 16,833 | 2.5% |
| Salt Lake County, UT | 12,674 | 2.6% |
| Bear Lake County, ID | 9,659 | 1.7% |
| Washakie County, WY | 5,494 | 0.4% |
| Franklin County, ID | 3,496 | 0.8% |
| Box Elder County, UT | 965 | 0.0% |
| Johnson County, WY | 306 | 0.0% |
| Wasatch County, UT | 260 | 0.1% |
| Caribou County, ID | 99 | 0.0% |
| Davis County, UT | 0 | 0.0% |
Septic absorption fields
NRCS rating, share of Lucky Star acres
Show as a table
| Category | Share of acres |
|---|---|
| Not limited | 0.0% |
| Somewhat limited | 2.2% |
| Very limited | 93.8% |
| Not rated | 4.0% |
Drainage, water table and flooding
Share of Lucky Star acres
- Depth to seasonal high water table
- About 4.1 feet (49 in) (median where reported).
- Flooding
- Not mapped as flooding on most acres.
- Slope
- Typically 18–45% (median 45%).
- Topsoil organic matter
- Median 6.5%.
Drainage class
Show as a table
| Category | Share of acres |
|---|---|
| Excessively drained | 0.0% |
| Somewhat excessively drained | 0.0% |
| Well drained | 94.5% |
| Moderately well drained | 1.5% |
| Somewhat poorly drained | 0.0% |
| Poorly drained | 0.0% |
| Very poorly drained | 0.0% |
| Not rated | 3.9% |
Hydrologic soil group
Show as a table
| Category | Share of acres |
|---|---|
| A: fast infiltration (mostly sandy or gravelly) | 0.0% |
| B: moderate infiltration | 85.4% |
| C: slow infiltration | 10.6% |
| 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% |
| Not rated | 4.0% |
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 Lucky Star (component kind "Series") in SSURGO: 189,538 acres.
- Method
- Shares are by mapped acres of Lucky Star components. The profile comes from the single largest Lucky Star component. Full methodology.