Elevation Certificates Along the Upper Snake River
An elevation certificate documents the elevation of a building's lowest floor relative to the Base Flood Elevation on FEMA's Flood Insurance Rate Map. In Bonneville County, the Snake River is the primary driver of flood zone designations. The river flows through Idaho Falls and continues southwest through the county, with a floodplain that affects properties close to the channel and in lower areas of the valley floor.
FEMA hydroelectric projects on the Snake River near Idaho Falls affect water levels and floodplain delineation in the area. Properties near these facilities and downstream of them may have flood zone designations that lenders require to be documented before closing. An elevation certificate from a licensed surveyor satisfies this requirement.
Cost of an Elevation Certificate in Bonneville County
| Property Type | Typical Cost |
|---|---|
| Standard residential property | $450 to $700 |
| Rural or agricultural property | $600 to $900 |
| Combined with boundary survey | Often discounted $100 to $150 |
The Snake River Floodplain in Idaho Falls
Idaho Falls is built along both banks of the Snake River, with many neighborhoods, parks, and commercial areas close to the water. The city's famous waterfall on the Snake River and the hydroelectric dam create a managed water environment, but the FEMA floodplain maps still reflect the potential for significant flood events. Properties within or adjacent to the mapped 100-year floodplain will likely require an elevation certificate when financed through a federally backed mortgage.
Irrigation Canals and Flood Zones
Bonneville County's agricultural irrigation network includes major canals with associated drainage channels. These water features can create localized low areas with flood zone designations that surprise property owners. If your lender's flood determination flags a property near an irrigation canal or drain, an elevation certificate will document whether the building's elevation actually places it at flood risk or whether the property is above the relevant BFE.
Letters of Map Amendment
If FEMA's map shows your property in a flood zone, but a surveyor's measurements show your lot and building are above the BFE, you may qualify for a Letter of Map Amendment. A LOMA removes the mandatory flood insurance requirement and can save hundreds of dollars annually. Ask your surveyor whether your property's situation appears to support a LOMA application.
Find a Surveyor for Your Elevation Certificate
Every surveyor in our Bonneville County directory is sourced from state licensing records and holds a current Professional Land Surveyor (PLS) license. Find one serving Idaho Falls, Ammon, or Ucon at /idaho/bonneville-county/.