Blog · October 14, 2026 · Oregon
Sherman County Flood Zone Map in Oregon
Look up any Sherman County address on FEMA's flood map, read the zone, and match it to the parcel record for land around Rufus.
Main page: Sherman County, OR GIS & Parcel Viewer (official map link, Sherman County facts and neighboring maps).
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A Sherman County flood zone map check belongs in the due diligence for any Sherman County property, from a house lot in Grass Valley to farm ground near Wasco. FEMA's free Flood Map Service Center and the Sherman County parcel viewer answer it together.
The sections below go from the FEMA search to the Sherman County parcel record, then cover insurance, permits and map changes near Wasco.
Where to see the official Sherman County flood zone map
FEMA's official flood maps for Sherman County are free at the FEMA Flood Map Service Center. The site returns the effective Flood Insurance Rate Map (FIRM) panel covering that Grass Valley location, which you can view or download. On acreage outside Grass Valley, try FEMA's National Flood Hazard Layer viewer, so you can see whether the shading reaches a house near Moro. Then open the ORMAP statewide tax lot viewer for Sherman County to confirm the parcel near Grass Valley. Match the Sherman County lines and acreage to the FEMA view, since flood maps do not draw property lines in detail.
Finding the tract on the Sherman County map
Sherman County parcels are viewed through a statewide map, the ORMAP statewide tax lot viewer; zoom toward Grass Valley to reach them. ORMAP gives the map and tax lot number for a county property near Rufus; the account details come from the county. For a backup route to the map covering Rufus, our Sherman County directory entry keeps the link current.
High, moderate and minimal risk in Sherman County
Any Sherman County parcel shaded as Zone A, AE, AH or AO sits in what FEMA calls a Special Flood Hazard Area, defined by a 1-percent annual chance of being flooded. A surveyor working near Grass Valley uses the base flood elevation printed for AE zones; unnumbered A zones do not have one. Shaded Zone X around Grass Valley is moderate risk, between the 1-percent and 0.2-percent annual chance lines. Clear, unshaded X near Grass Valley is outside the 500-year floodplain.
Low ground and small streams around Grass Valley
A low spot on a Sherman County tract outside any mapped zone can still flood; FEMA says moderate- and low-risk areas still carry risk.
A short buyer checklist for Rufus
Request any past flood claims history for a Sherman County property before closing; it tells you more than the map alone. An agent working in Sherman County can quote flood coverage once you know the zone for the lot near Wasco.
Map dates and floodways in Sherman County
Zones on the map covering Wasco can change after a restudy, so the date on the county panel matters. Floodways, shown as hatched areas on some panels, are the channel and nearby land that must stay open, and building there near Moro faces the strictest rules.
Insurance, permits and map changes
The zone lists up again when a loan on a house near Moro is underwritten. Where a building in Grass Valley falls inside an A or V zone and carries a federally backed mortgage, flood insurance is mandatory; that applies where the local government around Moro is in the National Flood Insurance Program. Outside the A zones around Moro, insurance is a choice, not a mandate, though a lender in Oregon can still ask for it. If a building near Moro sits above the flood line, the landowner can ask FEMA for a Letter of Map Amendment (LOMA), most commonly backed by an elevation certificate from a surveyor who works in the county. Adding on to a house near Moro inside the zone has to meet local floodplain rules, and the building office serving Moro explains the steps.
Sherman County, OR: common questions
What if FEMA's map is wrong about my house near Wasco?
FEMA reviews requests such as a LOMA for Sherman County properties; start with an elevation certificate.
Can I build in a flood zone in Sherman County?
Building in a Special Flood Hazard Area near Moro most commonly needs a floodplain permit and may require elevating the structure, so check with the county floodplain administrator.
Where do I get an elevation certificate in Sherman County?
A professional surveyor or engineer prepares it, and the building office serving Moro may already have one on file for newer construction.
Is flood insurance required for a Zone X lot in Moro?
Not under federal rules; Zone X in Sherman County is outside the Special Flood Hazard Area, though a lender can still require coverage.
What does 100-year flood mean for Sherman County land?
No, ground around Moro mapped that way carries a 1-in-100 chance in any single year, and two floods in one decade near Moro are possible.
Can I see flood zones on the Sherman County GIS map?
Check the layer list in the ORMAP statewide tax lot viewer; if Sherman County includes a floodplain layer, confirm the zone on FEMA's map anyway.
Open the official Sherman County, OR parcel map Sherman 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.