Bannock County, ID Environmental Rules: Erosion Control (2026)

Bannock County Code § 17.56.380(E) lists what a conditional use permit application must contain, and item (E)(6) specifically requires a grading plan with proposed erosion control measures whenever the site's average slope exceeds ten percent. That erosion-control submission works alongside the county's broader steep-slope limits in Section 17.52.530(B)(2): on slopes between 15 and 30 percent, no more than 20 percent of the area may be developed, regraded, or stripped of vegetation, and any disturbed soil must be reseeded to Natural Resource Conservation Service standards; on slopes over 30 percent that development ceiling drops to 5 percent of the area, and no buildings are permitted at all on slopes of 20 percent or greater.

Once a conditional use permit is granted, Section 17.56.420(A)(2) lets the Planning and Development Council attach ongoing conditions requiring installation and maintenance of erosion control measures for the life of the use, not just during construction. The planning director reviews the erosion control plan alongside the rest of the site plan, and county engineering staff can inspect drainage and grading work while it is under construction under Section 17.52.540(B), with authority to suspend a building permit if the site is not built to the approved plan.