Southeast Idaho Riverfront Setbacks, Riparian Buffers, and Shoreline Restrictions (By County)

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Riverfront property in Southeast Idaho is regulated by more than one “rulebook.” In practice, owners and buyers are usually dealing with overlapping requirements from:

  • County zoning and land development codes (setbacks, permitted uses, overlays, subdivision rules)
  • Local floodplain ordinances adopted for participation in FEMA’s National Flood Insurance Program (NFIP)
  • State and federal permitting for certain work in/near water (for example, stream alteration and Clean Water Act requirements)

This page is designed as a practical, county-by-county reference. It summarizes what we can verify in the published codes and ordinances and provides direct hyperlinks to the source material so you can confirm details (and verify any updates).

Start Here: Two Riverfront Rules That Apply Nearly Everywhere

1) FEMA flood maps and local floodplain permits

If a property is in a mapped Special Flood Hazard Area (SFHA), most counties require a floodplain development permit before building, filling, grading, or making certain improvements. Your lender may also require flood insurance depending on the zone.

2) Work near water may require state/federal approvals

Bank stabilization, channel work, dredging/fill, and some shoreline improvements can trigger additional review beyond county zoning. Floodplain ordinances commonly reference federal requirements such as Clean Water Act permitting.

Counties Covered on This Page

This page focuses on the core Southeast Idaho riverfront markets most Two70 clients search: Bannock, Bingham, Bonneville, Jefferson, Madison, Fremont, and Teton. If you want Caribou, Bear Lake, Franklin, Oneida, or Power added, tell us which counties you consider “Southeast Idaho” for your site map and we’ll expand the page.

Bannock County (Pocatello area and south)

Bannock County’s zoning ordinance includes explicit language about stream/riparian setbacks and shoreline restrictions. In multiple districts, the ordinance states that structures must be set back from streams or riparian areas, and it also includes shoreline restrictions for lakes/ponds/rivers.

What the Bannock County ordinance specifically says (high-level)

  • Stream / riparian corridor setback: The ordinance includes standards stating that structures shall be set back 100 feet from any stream or riparian area in certain districts and tables.
  • Shorelines of lakes, ponds, rivers: The ordinance includes a shoreline restriction stating that certain items (including structures, animal runs/enclosures, and septic drainfields) are not permitted within 100 feet of the riparian area surrounding a body of water.

Because Bannock’s ordinance includes multiple zoning districts and tables, the correct distance and how it applies can depend on the zoning designation. For a specific parcel, confirm the zoning map and the applicable district standards, then verify how the County measures from the “riparian area” or corridor line.

Bingham County (Blackfoot, Shelley area)

Bingham County’s codified ordinances include a dedicated Flood Damage Prevention chapter. These rules focus on floodways, flood hazard areas, and permitting standards (NFIP-style), including “no-rise” style requirements in floodways.

Important practical note

Bingham’s flood control code is not the same thing as a county-wide riparian buffer ordinance. If you are looking for a fixed “riparian setback distance,” it may be found in zoning overlays, subdivision conditions, or project-specific requirements rather than in the flood code itself. The floodway rules still matter because they can restrict new development, fill, and improvements close to rivers and streams.

Bonneville County (Idaho Falls area)

Bonneville County’s codified ordinances include a comprehensive flood damage prevention chapter with permit procedures, construction standards, and references to “stream setback” concepts within the floodplain context.

What we can confirm vs. what you should verify with the County

  • Confirmed: Bonneville’s flood ordinance is detailed about floodplain development permits, elevation certificate timing, and standards tied to FEMA mapping and NFIP compliance.
  • Verify locally: The code references “stream setback” in context, but the flood chapter itself may not publish a single universal riparian buffer distance. In practice, your setback constraints may come from the zoning district, overlays, subdivisions/plat notes, or floodway boundaries.

Jefferson County (Rigby area)

Jefferson County’s zoning ordinance includes a section on canal setbacks and also identifies setbacks for certain waterways measured from the high water mark. These are highly relevant to riverfront and water-adjacent property in the county.

Key water-related setback provisions to review

  • Canal setbacks (Sec. 112-335): Includes setbacks measured horizontally from the high water mark on each side of incorporated canals (and a larger setback for certain elevated incorporated canals).
  • Navigable waterways / “Waters of the United States” (Sec. 112-335): Includes an 80-foot setback measured horizontally from a point perpendicular to the high water mark on each side of certain waterways as identified in the ordinance.

Because these provisions can be technical (and canal systems vary), it’s smart to confirm the classification of the water feature on/near the property (canal vs. river vs. drainage vs. mapped floodway) and how Jefferson County measures the high water mark for enforcement.

Madison County (Rexburg area)

Madison County participates in floodplain regulation and requires additional steps when building in a floodplain. While we can confirm floodplain permitting requirements via county guidance, riparian buffer distances are often handled through zoning, overlays, subdivision conditions, or mapped constraints rather than a single countywide “riparian buffer” table (depending on the area).

Practical guidance for Madison County riverfront buyers

  • Confirm whether the parcel is in a mapped floodplain and whether a floodplain development permit is required for the improvements you want.
  • Ask Planning & Zoning which zoning district applies and whether any overlay, plat note, or subdivision condition establishes water setbacks beyond standard yard setbacks.

Fremont County (Ashton, St. Anthony, Island Park area)

Fremont County is a high-demand riverfront and lakeshore market, and the county has referenced stream and lakeshore corridors as regulated areas requiring permits. Fremont also publishes county setback guidance on certain application checklists that can be helpful for understanding local expectations.

What to watch closely in Fremont County

  • Stream/lakeshore corridor permitting: If your project is within a regulated corridor, expect permit review even if the project seems “small.”
  • Setback measurement: Fremont materials sometimes reference high water mark vs. corridor-based measurements; confirm which one applies to your parcel and project type.
  • Island Park and resort-area overlays/plat notes: Many real constraints show up in recorded subdivision documents (HOA/CC&Rs, building envelopes, shoreline restrictions) rather than in a single countywide buffer table.

Teton County (Driggs / Victor area)

Teton County has some of the most explicit and detailed riparian and wetland setback rules in the region, including a table of riparian buffer distances and a list of prohibited activities within riparian buffers.

Riparian buffer distances (Table 7)

  • Teton River: 100 feet from the Ordinary High Water Mark (OHWM)
  • Streams / creeks: 50 feet from the Ordinary High Water Mark (OHWM)
  • Wetlands: setbacks vary depending on whether the wetland is mapped in the National Wetland Inventory or based on a site-specific delineation

Activities commonly prohibited in riparian buffers (see code for the full list)

  • New physical development except as specifically allowed
  • Septic drainfields
  • Grading that disrupts diffuse flow
  • Limitations on crossings, with preference for bridges and controlled impacts

If you are buying riverfront in Teton County, you should treat riparian buffer rules as a front-end feasibility check: where you can build, where septic can go, and how access is constructed can all be shaped by the buffer rules.

Optional but Highly Relevant: City-Level River Corridor Rules (Examples)

Some riverfront constraints are city-specific, not county-wide. If your riverfront property is inside a city boundary, review the city code too.

How to Use This Page When Buying Riverfront Property

  • Step 1: Identify the jurisdiction (county + city, if applicable) and zoning designation.
  • Step 2: Check the floodplain and floodway mapping (FEMA/IDWR tools).
  • Step 3: Confirm whether the county/city has a riparian buffer table or a stream/canal/lakeshore setback section (like Bannock, Jefferson, or Teton).
  • Step 4: Pull the title report and recorded plat/CC&Rs for shoreline easements, public access corridors, and building envelope notes.
  • Step 5: Before you plan a dock, steps, riprap, grading, or a new shop near the river—ask permitting questions early.

If you want help evaluating a specific riverfront property, talk with a Real Estate Two70 agent. The goal is simple: enjoy the river, and avoid expensive surprises.

Riverfront Property

  • Riverfront Property near Ashton
  • Riverfront Property near Driggs
  • Riverfront Property near Island Park
  • Riverfront Property near Rexburg
  • Riverfront Property near Swan Valley
  • Riverfront Property near Saint Anthony

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