Blog · October 14, 2026 · Wyoming
Sweetwater County Flood Zone Map (Wyoming)
FEMA's free flood maps and the Sweetwater County parcel viewer, used together for property near Granger.
Main page: Sweetwater County, WY GIS & Parcel Viewer (official map link, Sweetwater County facts and neighboring maps).
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The Sweetwater County flood zone map question tends to arrive at a bad moment: a lender's letter, an insurance quote, or a permit counter in Granger. Here's how to read FEMA's map for a Sweetwater County, WY property and match it to the parcel record.
We'll cover finding a Sweetwater County address on FEMA's map, what Zone A, AE and X mean, how the county viewer fits in, and what to do if the map looks wrong.
How to check the Sweetwater County flood zone map
Open the FEMA Flood Map Service Center and type a county street address, say one in Rock Springs. Download the FIRM panel FEMA lists as effective for that part of Sweetwater County. If the PDF panel for Sweetwater County is hard to read, try FEMA's National Flood Hazard Layer viewer, which lists how much of a Sweetwater County parcel sits inside the zone. Next, the Sweetwater County parcel viewer confirms which Sweetwater County parcel you're looking at. The Sweetwater County record gives the parcel ID and legal description that an insurer or lender near Rock Springs may ask for.
Opening the Sweetwater County parcel viewer
Sweetwater County publishes its parcels on the Sweetwater County parcel viewer, free to use for a lot in Bairoil or a property near Rock Springs. Most people find their Sweetwater County tract fastest by searching an address in Rock Springs, then clicking the outline. For a backup route to the map covering Rock Springs, our Sweetwater County directory entry keeps the link current.
High, moderate and minimal risk in Sweetwater County
Any Sweetwater County parcel shaded as Zone A, AE, AH or AO sits in what FEMA calls a Special Flood Hazard Area, meaning FEMA estimates a 1-percent annual chance of flooding. Where a Sweetwater County tract lists Zone AE, there's a base flood elevation to compare a building against; in Zone A there isn't one. If a Sweetwater County parcel lists shaded Zone X, it is moderate risk, between the 1-percent and 0.2-percent annual chance lines. Clear, unshaded X near Rock Springs is outside the 500-year floodplain.
Low ground and small streams around Rock Springs
A creek near Bairoil that lists no detailed zone can still flood; FEMA says moderate- and low-risk areas still carry risk.
Insurance, permits and map changes
Lenders watch the zone closely on Sweetwater County properties. If a house near Bairoil is mapped in a high-risk zone and is financed by a regulated or federally insured lender, the lender must require flood coverage, as long as Sweetwater County or the town participates in the NFIP. For a Sweetwater County home in shaded or unshaded X, federal rules don't require a policy, although some lenders require it anyway. Where a structure near Rock Springs looks higher than the shading suggests, the titleholder can ask FEMA for a Letter of Map Amendment (LOMA); a surveyor near Bairoil can supply the elevation data. New construction in a Sweetwater County Special Flood Hazard Area has to meet local floodplain rules; the Sweetwater County floodplain administrator can say what applies.
Near the Sweetwater County line
A farm near the county line can carry separate records in Moffat County, CO, Daggett County, UT, and Summit County, UT as well. Our Wyoming page links each map neighboring Sweetwater County.
Sweetwater County land records
Deeds and plats behind the Sweetwater County map are kept by the county's recording office; the official Sweetwater County website names which office that is. Copy the parcel ID and legal description from the county record well before you request a deed for land near Bairoil.
From Green River to the back roads
From Green River, the seat of the county, the map spreads out to Rock Springs, Bairoil, Granger, and Superior. Smaller places such as Arrowhead Springs, Clearview Acres, and Eden appear on the Sweetwater County map as little clusters of lots. Census Bureau estimates put Sweetwater County at about 41,249 residents in 2023 on about 10,427 square miles of land. Outside Bairoil, most of the county map is farm, ranch or timber ground with large, irregular tracts. With a founding date of 1867, Sweetwater County has long chains of title on some rural tracts.
Sweetwater County, WY: common questions
Do I need flood insurance in Zone X in Sweetwater County?
For a Zone X house near Green River, federal rules don't require flood insurance; buying it is still a choice worth pricing.
How do I know if a property in Sweetwater County is in a flood zone?
Look it up at FEMA's Flood Map Service Center, then match the parcel lines in the county parcel viewer; for land near Green River, a zone starting with A or V is high risk.
How do I challenge a flood zone for a lot in Superior?
For a lot in Superior, hire a surveyor for an elevation certificate, then file a LOMA request with FEMA.
Can I build in a flood zone in Sweetwater County?
Often, but local floodplain rules apply; ask the county or town building office in Superior well before you buy.
Is Zone AE near Green River high risk?
Zone AE on a lot in Superior is a mapped 100-year floodplain with a base flood elevation, so mandatory insurance rules apply to federally backed mortgages.
Is there a floodplain layer in the Sweetwater County parcel viewer?
Check the layer list in the Sweetwater County parcel viewer; if Sweetwater County includes a floodplain layer, confirm the zone on FEMA's map anyway.
Open the official Sweetwater County, WY parcel map Sweetwater County in the Platbookmapper directory
Not a survey. County GIS and tax parcel maps are assessment and planning layers. They are not a substitute for a recorded plat, deed, or licensed survey, especially for fences, setbacks, or boundary disputes.