Washington County lies in the eastern Missouri Ozarks, where Potosi, Mineral Point, Irondale, and Caledonia occupy a landscape cut by the Big River and numerous narrow creek valleys. Potosi is the main administrative and road reference, with Routes 8, 21, and 47 meeting nearby. Much of the western and southern county is considerably more rugged, with winding roads following ridges and valleys rather than a regular grid. High-resolution map files are available for download in the section below.
This page separates those features into a general county map, a city-connections map, a terrain-and-water map, and an elevation map showing roughly 163 to 484 meters of relief. The high-resolution JPG originals can be downloaded together in one ZIP for enlargement, A3 printing, classroom materials, reports, or personal reference.
Table of Contents
Potosi anchors the Routes 8, 21, and 47 road network
Potosi is the easiest place to begin reading the general map. It lies in the east-central county where several numbered routes converge, and the official Washington County website places the courthouse at 102 North Missouri Street in Potosi. That combination of government and transportation functions makes the town the strongest reference point for the entire county.
Route 8 extends west from Potosi across the interior hills, while Route 21 continues south toward Caledonia and the southern county line. Route 47 provides an eastern and northeastern reference toward the St. Francois County side. Using these three roads first makes the dense network of smaller routes much easier to organize.
Mineral Point lies just north and east of Potosi, while Irondale appears farther southeast. In the western interior, Routes 202, 205, 303, and 304 cross hilly terrain; Route 319 helps locate the north-central area, and Routes 361, 402, and 104 provide references farther northeast. Routes 603, 617, 657, and 32 organize parts of the southern county.
The county road pattern becomes increasingly irregular away from Potosi. Long straight corridors are uncommon in the rougher western and southern uplands, and many local roads bend with creek valleys or cross narrow ridges. Starting with the major numbered routes is therefore more useful than trying to follow minor roads immediately.
Mineral Point, Irondale, and Caledonia sit within 3 to 12 miles of Potosi
The city-connections map uses Potosi as its hub and highlights Mineral Point, Irondale, and Caledonia. The map index labels Potosi with 2,544, Irondale with 622, Mineral Point with 324, and Caledonia with 209, making Potosi the largest of the four highlighted places.
The distance labels are straight-line measurements rather than driving mileage. Mineral Point is about 3 miles from Potosi, Irondale about 9 miles, and Caledonia about 12 miles. Actual road trips can be longer because the county’s routes bend around hills and stream valleys.
The three connected places also occupy different directions. Mineral Point lies very close to Potosi on the northeast side, Irondale is farther southeast, and Caledonia sits near the southern edge. Together they provide a useful orientation framework for the more settled eastern half of the county.
The western half has few comparable urban labels and is dominated instead by streams, ridges, and local roads. That contrast is useful when moving from the city map back to the general map: the eastern communities provide recognizable anchors, while the western interior is better navigated by routes and waterways.
Big River and western creeks carve deep valleys through the county
The Big River is the strongest water feature in the southeastern county. It winds through deeply incised terrain south and east of Potosi, with multiple tributaries joining from surrounding ridges. Spring Glen Lake provides a useful water landmark near this southern river corridor.
Lost Creek and Clear Creek form long lower valleys across the west, while Courtois Creek runs near the southwestern boundary. Indian Creek cuts through the northwest. These streams are important because their valleys are clearly lower than the surrounding uplands on the elevation map.
Mineral Fork provides another central-northern reference, while Mill Creek appears in the east near Powder Spring Lake. Artesian Lake lies in the north; Diablo Lake and Lake Four Winds sit closer to the center; Sonnen Lake is farther west; and Potosi Lake lies in the southeast. Washington County therefore contains many small waterbodies but no single large reservoir dominating the map.
The terrain-and-water map is intended for geographic reference, not flood determination, depth analysis, navigation, parcel boundaries, or legal water boundaries. Big River, the smaller creeks, and the lakes can change with rainfall and season, so current water or safety decisions should rely on up-to-date official information.
Elevation ranges from about 163 to 484 meters
The elevation map reports an actual range of roughly 163 to 484 meters and a mean near 286 meters. The highest brown terrain extends through the central and southwestern interior, with several ridges rising well above 400 meters. High ground also appears in the northwest and south, giving the county a strongly dissected Ozark landscape.
The lowest green terrain follows the Big River and several major creek valleys. Lost Creek and Clear Creek create long lower corridors in the west, while Indian Creek produces another pronounced low route in the northwest. In many places the land rises quickly from the stream floor to adjacent ridges.
The east-central Potosi area is lower than the highest southwestern uplands but still contains repeated hills and small valleys. Around Irondale, the Big River system creates lower terrain beside steeper ridges. The contrast between the broad high interior and the deeply cut stream corridors is one of the clearest features on the map.
This county-scale elevation surface is useful for broad relief comparison, not for engineering, construction, drainage design, parcel-level elevation decisions, or survey-grade measurement. Site-specific work requires more detailed official elevation data or field surveying.
Use Potosi for orientation, then compare roads with Big River and the Ozark relief
Start with Potosi and Routes 8, 21, and 47 when roads and settlements matter most. Mineral Point lies just northeast, Irondale southeast, and Caledonia farther south. In the western interior, Routes 185, 202, and 205 become more useful than town labels because the settlement pattern is sparse.
For terrain, begin with the Big River and then compare Lost Creek, Clear Creek, Indian Creek, and Courtois Creek. Switching to the elevation map shows that these waterways occupy green lower corridors while high brown ridges dominate much of the central and southwestern county.
Washington County can look relatively simple if the map is viewed only as a set of roads around Potosi, but the terrain maps show a much more rugged setting. The western and southern interior is broken by closely spaced ridges and narrow valleys, and the Big River cuts a major low route through the southeastern side.
The downloadable JPG originals contain more pixels than the WebP previews embedded on the page, making them better for enlargement, A3 printing, classroom handouts, reports, and personal reference. They remain general-purpose maps, however. Legal boundaries, live road restrictions, current water conditions, and precise site elevations should always be checked against current official sources.
Frequently Asked Questions
How far are Mineral Point, Irondale, and Caledonia from Potosi?
The city map shows straight-line distances of about 3 miles from Potosi to Mineral Point, 9 miles to Irondale, and 12 miles to Caledonia. Driving mileage can be longer because roads follow the county’s hills and valleys.
How much elevation change is shown across Washington County?
The elevation map shows an actual range of about 163 to 484 meters with a mean near 286 meters. Central and southwestern ridges are high, while Big River, Lost Creek, Clear Creek, and other major valleys are much lower.
Which waterways are the best starting points on the terrain map?
Start with the Big River in the southeast, then compare Lost Creek and Clear Creek in the west, Indian Creek in the northwest, and Courtois Creek near the southwestern boundary.
Map File Information
The download ZIP contains high-resolution JPG versions of the Washington County general map, city map, terrain-and-water map, and elevation map.
- File Type: JPG
Related Maps
Sources and References
Boundary and road reference data are supported by U.S. Census Bureau TIGER/Line, water features by USGS National Hydrography, and elevation data by the USGS 3D Elevation Program. County government and courthouse information is available from the official Washington County website and its courthouse page.
Green Map creates custom-edited map images using open geographic data sources such as geoBoundaries, Natural Earth, OpenStreetMap, and government open data. These maps are edited visual materials, not raw data files, and are provided for education, documents, presentations, and graphic reference.
