| Not Prime (0) |
| All areas prime farmland (1) |
| Prime if drained (2) |
| Prime if irrigated (4) |
| Prime if drained and either proteced from flooding or not frequently flooded during the growing season (5) |
| Prime if irrigated and either protected from flooding or not frequently flooded during the growing season (7) |
| Farmland of Statewide Importance (30) |