Washington County, MO Elevation & Topographic Map
Elevation
1,590 ft 485 m1,330 ft 405 m1,190 ft 365 m930 ft 285 m660 ft 200 m530 ft 160 m
Contours every 500 ft, bold every 2,500 ft
USGS 3DEP · U.S. Census Bureau
How to use this mapviews, tools and data
- Elevation
- Ground colored by height from green (lowest) to white (highest), with contour lines every 40–500 ft (USGS data).
- Satellite
- A 2016 satellite photo at 33 ft (10 m) detail; contours off.
- 3D
- Tilt and turn the terrain; hills are raised 1.5×, or set ×1 for true height.
- Click or tap anywhere
- The exact elevation of that spot in ft and m.
- Measure
- Pick two points for the climb, descent and grade along a straight line.
- County area
- Fades everything outside the official county boundary (US Census).
Elevation Data
Washington County averages about 940 ft (285 m) above sea level across all its land. Its ground runs from 530 ft on the northeast side to 1,590 ft on Pruitt Mountain.
Average elevation
940 ft 285 m
all land inside the county
Highest
1,590 ft 485 m
on Pruitt Mountain
Lowest
530 ft 160 m
on the northeast side
Washington County spans about 1,060 ft of height, so no single spot tells the whole story. The ruler shows where most of its land lies, and where the other numbers you'll see come from.
| Figure | Elevation |
|---|---|
| Average of all land | 940 ft285 m |
| Highest point Inside the county, on Pruitt Mountain (3DEP terrain model; no NGS survey height) | 1,590 ft485 m |
| Lowest point Inside the county, on the northeast side | 530 ft160 m |
Elevation profile, south to north
32 mi south to north through Potosi.
Topographic Map
- Location
- County in Missouri, United States
- Population
- 23,583 2024 est.
- Land area
- 759.9 sq mi + 2.6 sq mi water
- Density
- 31 per sq mi
- Time zone
- Central UTC−6 / −5
- Landform region
- Ozark Plateaus
- Drains to
- Gulf of America
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Sources: U.S. Census Bureau, USGS
Nearby Places
Neighboring counties sharing a border, by average
- Iron County1,070 ft
- Washington County940 ft
- Crawford County930 ft
- St. Francois County920 ft
- Franklin County670 ft
- Jefferson County630 ft
Rankings by average elevation
- Counties in Missouri38th highest of 114
- Counties in the United States1,516th highest of 3,151
Peaks and hills highest inside
- Pruitt Mountain1,590 ft
- Little Pilot Knob1,410 ft
- Flint Hill1,330 ft
- Litton Hill1,290 ft
- Stony Point1,290 ft
All 5 towns in Washington County by typical elevation
- Potosi960 ft
- Terre du Lac partly940 ft
- Caledonia910 ft
- Irondale880 ft
- Mineral Point880 ft
How we measure
- Average: every USGS 3DEP bare-earth cell of land inside the Census county boundary (TIGER/Line, Jan 1 2026), weighted equally, on a 1 arc-second (≈100 ft, 30 m) grid. Land means the boundary minus Census area water.
- Highest and lowest: the highest land cell; it is a named summit, so its height is the peak method: the 3DEP top on a ~7 ft (2 m) window, or the NGS published height when a survey mark sits within 160 ft (50 m) of it. Lowest: the lowest land cell; coastal ground within 3 ft (1 m) of named tidal water counts as sea level.
- Nearby Places: neighboring counties and rankings use each one's average elevation, on its own grid, the same figure its page shows. Peaks and hills: the highest summits inside the county with at least 980 ft (300 m) of prominence, then the highest federal (GNIS) summits inside it when there are fewer than 5; each is the 3DEP top on a ~7 ft (2 m) window, or the NGS published height when a usable survey mark sits within 160 ft (50 m) of it (shown as published).
- Towns: each town's typical elevation (population-weighted median of its own 2020 blocks at 1 arc-second); a town is listed when any of its 2020 residents live in the county.
- Rounding: computed heights are rounded to 10 ft (5 m), or to 1 ft (1 m) under 100 ft; 3DEP is good to about a meter, not a foot. Published figures (NGS survey heights) are shown as their publisher gives them.
- Datum: North American Vertical Datum of 1988 (NAVD 88). NGS plans to replace NAVD 88 with a new datum (NAPGD2022); heights will then shift slightly.
- Sources: USGS 3DEP, GNIS, Watershed Boundary Dataset and physiographic provinces; U.S. Census Bureau (TIGER boundaries and water, 2020 blocks, 2024 population estimates, county adjacency); NOAA NGS survey heights; BTS time zones. All public domain.