Flood Zones and Grand River Flood History in Daviess County, Missouri

1993: Pattonsburg's wholesale relocation off the floodplain

Pattonsburg, on the Grand River in southeastern Daviess County, was flooded twice within weeks during the historic Flood of 1993 -- part of the broader Great Flood of 1993 that devastated communities across the Missouri and Mississippi River basins. Rather than rebuild in place, the town undertook a full relocation: residents moved the town roughly four miles north to higher ground, funded through FEMA's Hazard Mitigation Grant Program (established by the 1988 Stafford Act) and a federal buyout of the flooded properties. Academic accounts of the relocation put the total project cost at roughly $12.5 million, including about $6 million to acquire 235 flooded properties, with the remainder used to develop a new roughly 600-acre townsite. Individual residents who chose to relocate reportedly received $10,000 plus a buyout offer on their flooded home. Pattonsburg is one of only three U.S. towns -- alongside Valmeyer, Illinois, and Rhineland, Missouri -- that completed a full wholesale relocation off a floodplain after the 1993 flood, making it a genuinely rare and well-studied case in flood-mitigation and 'managed retreat' literature.

The original townsite -- now referred to as Old Pattonsburg -- remains largely vacant floodplain today. A handful of structures, including the Old Pattonsburg Christian Church, still stand as visible reminders of the site's history, but the area was never substantially rebuilt, precisely because it sits in the Grand River's active floodplain. If you come across land near this stretch of the river marketed as inexpensive acreage close to Pattonsburg, understand exactly why that land was cheap enough for an entire town to walk away from it.

2017: the Grand River flooded again, with real numbers to check against a specific parcel

The 1993 flood was not a one-time event for this stretch of river. In late June and early July 2017, the Grand River near Gallatin rose to a crest of roughly 36.8 feet -- well above the 26-foot flood stage at that gauge, and among the worst flood events on record for the county according to the Daviess County Historical Society's own archive. At that crest level, nearly all agricultural land and secondary roads within the floodplain were underwater; U.S. Highway 69 floods around 34.5 feet with railroad tracks near Pattonsburg submerged, and the business section of Old Pattonsburg's original site begins flooding at the 32-foot mark. The Grand River near Gallatin is monitored by an active USGS/NOAA stream gauge, so current conditions and historical crest data for this specific location are checkable in real time.

For a land buyer, these are not abstract numbers -- they're a documented, repeatable pattern for a specific river reach. Before treating any Grand River-adjacent parcel in Daviess County as buildable, pull the current effective FEMA Flood Insurance Rate Map for that parcel from the FEMA Flood Map Service Center, check the parcel's elevation against the flood-stage figures above (a parcel that floods at 30-32 feet is a very different proposition than one whose lowest point sits well above the historical crest), and call the county's floodplain administrator to confirm whether a floodplain development permit would be required for your intended use.

What this means for evaluating a parcel today

A few practical takeaways follow directly from this history. First, distance from the river's normal channel is not the same as elevation above flood stage -- Old Pattonsburg's original townsite is not directly adjacent to the river, but it sits low enough in the floodplain to flood repeatedly. Second, because Daviess County has no county-wide zoning, there is no zoning-based floodplain overlay district doing extra work here -- floodplain regulation runs through the county's participation in the National Flood Insurance Program and the state/SEMA floodplain-management framework directly, administered through the county courthouse, so a floodplain determination and any required development permit is a distinct process from anything zoning-related. Third, if you're specifically drawn to land near Pattonsburg or along the Grand River for its price, ask directly whether that price reflects flood risk, and get an elevation certificate or a licensed surveyor's read on the parcel's flood-zone status before committing.