Iowa Code Ch. 161D — Loess Hills Development and Conservation Authority + Alliance (IA)
Tracked preemption from the Iowa overlay bundle.
Overview
← All state preemptionsIowa overlay roll-upIowa zoning wikiIowa building codesFederal overlaysGlossaryFederal-conflict: Not flagged
Effective
1999-03-15
Sunset
—
Authority
state
Scope
state:IA
Other Iowa preemptions
Iowa SF 592 (2025) — Statewide Accessory Dwelling Unit By-Right MandateIowa Code §414.1(2) — Short-Term Rental Preemption (Residential Use Classification)Iowa Code §459.310 — Master Matrix CAFO Siting ScorecardIowa Code §414.28 / §335.30 — Manufactured Home Zoning Parity MandateIowa Code Ch. 303 — State Historical Society / SHPO Review + Local Historic Preservation CommissionsIowa Code §352.6 — Agricultural Area Designation + Right-to-Farm Nuisance ProtectionIowa Code Ch. 455B + 567 IAC 71 — Floodplain Development Approval (DNR Flood Plain Program)Iowa Code Ch. 461A + 571 IAC 13 — Sovereign Lands Construction Permits
Trigger predicate
When this evaluates true for a parcel, the law's preempted fields take precedence over base zoning.
OR
parcel.county_fips∈ {19129,19193,19133,19085,19155,19129,19071}city.in_loess_hills_alliance_county==True
Preempted fields
2 fields on the base district schema are rewritten when the trigger fires.
| Field | Op | Value | Note |
|---|---|---|---|
review_type | advisory | loess_hills_alliance_consultation | The Loess Hills Alliance (created within the Loess Hills Development and Conservation Authority) provides advisory stewardship, protection, information/education, and economic-development review for projects in the seven Alliance counties (Plymouth, Woodbury, Monona, Harrison, Pottawattamie, Mills, Fremont). The Authority itself spans 23 counties (Adair, Adams, Audubon, Carroll, Cass, Cherokee, Crawford, Fremont, Guthrie, Harrison, Ida, Lyon, Mills, Monona, Montgomery, Page, Plymouth, Pottawattamie, Sac, Shelby, Sioux, Taylor, Woodbury), each entitled to one voting member. |
redevelopment.hungry_canyons_account | permit | state_appropriation_for_loess_erosion_control | The Hungry Canyons Account of the Loess Hills Fund supports erosion-control infrastructure in the Loess Hills. |
Citation
Authority source
Iowa Code ch. 161D (Loess Hills and Southern Iowa Development and Conservation); §161D.5 (alliance counties).
§ Iowa Code ch. 161D; §161D.5
Research notes
Advisory/coordination overlay — Ch. 161D does NOT directly preempt local zoning, but creates a state-recognized stewardship framework that local zoning decisions on slopes >18% in the Loess Hills are commonly reviewed against. Loess Hills is a globally rare geologic formation (windblown silt deposits >60 ft thick, the deepest outside the Yellow River basin in China). National Park designation has been studied (Grassley legislation) but not enacted as of 2026-05-18. Note: the geographic predicate uses the 7 marquee Alliance counties (Plymouth=19149, Woodbury=19193, Monona=19133, Harrison=19085, Pottawattamie=19155, Mills=19129, Fremont=19071); the Authority's broader 23-county footprint is captured in the city-attribute flag rather than enumerated FIPS codes.