Madison County Area, Idaho
The dominant drainage class is Well drained and the dominant hydrologic group is B (moderate infiltration). This report summarizes the major soil map units across the survey area to help you understand what to expect when buying, building, or gardening in Madison County Area, Idaho.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Ririe silt loam, 4 to 8 percent slopes | 22K | Well drained | B | Not limited | Somewhat limited |
| Rexburg silt loam, 4 to 8 percent slopes | 18K | Well drained | B | Not limited | Somewhat limited |
| Tetonia-Ririe silt loams, 4 to 12 percent slopes | 15K | Well drained | B | Not limited | Somewhat limited |
| Rexburg silt loam, 2 to 4 percent slopes | 12K | Well drained | B | Not limited | Somewhat limited |
| Haplaquolls, channeled | 9K | Poorly drained | C/D | Very limited | Very limited |
| Blackfoot silt loam | 8K | Somewhat poorly drained | C | Very limited | Very limited |
| Mathon-Rock outcrop-Modkin complex, 0 to 12 percent slopes | 8K | Well drained | A | Very limited | Very limited |
| Eginbench loamy coarse sand, wet | 8K | Somewhat poorly drained | A | Very limited | Very limited |
| Ririe silt loam, 8 to 12 percent slopes | 8K | Well drained | B | Somewhat limited | Somewhat limited |
| Greys silt loam, 20 to 30 percent slopes | 7K | Well drained | C | Very limited | Very limited |
| Mathon-Rock outcrop complex, 2 to 20 percent slopes | 7K | Well drained | A | Somewhat limited | Somewhat limited |
| Panmod silt loam, 4 to 12 percent slopes | 6K | Well drained | C | Not limited | Very limited |
| Withers silty clay loam | 6K | Somewhat poorly drained | C | Somewhat limited | Very limited |
| Annis silty clay loam | 6K | Moderately well drained | C | Somewhat limited | Very limited |
| Labenzo silt loam | 6K | Moderately well drained | A | Somewhat limited | Very limited |
| Ririe-Rexburg silt loams, 4 to 12 percent slopes | 6K | Well drained | B | Not limited | Somewhat limited |
| Bannock loam | 5K | Well drained | B | Not limited | Somewhat limited |
| Lantonia silt loam, 4 to 12 percent slopes | 5K | Well drained | B | Not limited | Somewhat limited |
| Rexburg silt loam, 0 to 2 percent slopes | 5K | Well drained | B | Not limited | Somewhat limited |
| Tetonia silt loam, 8 to 12 percent slopes | 4K | Well drained | B | Somewhat limited | Somewhat limited |
What This Means
Building & Foundations
About 23% of soils have significant building limitations, while the rest are generally suitable. Check specific sites carefully — conditions vary across the area.
Septic Systems
About 38% of soils have significant septic limitations, while others are more suitable. A perc test is essential — conditions vary across the area.
Gardening & Agriculture
Well-drained soils on sloped terrain — good for most plants but watch for erosion. Terracing, contour planting, and mulching help retain moisture and topsoil. Drip irrigation is more effective than sprinklers on slopes.