Dewey County, SD Elevation & Topographic Map

Topographic elevation map of Dewey County, South Dakota, shaded from 1,570 ft on the south side to 2,460 ft on the west side
Elevation
2,460 ft 750 m2,240 ft 685 m2,130 ft 650 m1,910 ft 580 m1,680 ft 510 m1,570 ft 480 m
Zoom in for contour lines
USGS 3DEP · U.S. Census Bureau
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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

Dewey County averages about 2,010 ft (615 m) above sea level across all its land. Its ground runs from 1,570 ft on the south side to 2,460 ft on the west side.

Average elevation
2,010 ft 615 m
all land inside the county
Highest
2,460 ft 750 m
on the west side
Lowest
1,570 ft 480 m
on the south side

Dewey County spans about 890 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.

FigureElevation
Average of all land2,010 ft615 m
Highest point
Inside the county, on the west side
2,460 ft750 m
Lowest point
Inside the county, on the south side
1,570 ft480 m

Elevation profile, west to east

53 mi west to east through North Eagle Butte.

Topographic Map

Topographic elevation map of Dewey County, South Dakota, shaded from 1,570 ft on the south side to 2,460 ft on the west side
County boundary (dashed) over shaded terrain, with contours every 100 ft (30 m).
Location
County in South Dakota, United States
Population
5,322 2024 est.
Land area
2,302.4 sq mi + 142.9 sq mi water
Density
2.3 per sq mi
Time zone
Mountain UTC−7 / −6
Landform region
Great Plains
Drains to
Gulf of America
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Sources: U.S. Census Bureau, USGS

Nearby Places

Neighboring counties sharing a border, by average

  1. Ziebach County2,270 ft
  2. Corson County2,100 ft
  3. Dewey County2,010 ft
  4. Potter County1,950 ft
  5. Walworth County1,910 ft
  6. Stanley County1,890 ft
  7. Sully County1,810 ft

Rankings by average elevation

Peaks and hills highest inside

  • Twin Buttes, Dewey County2,330 ft
  • Brewer Butte2,280 ft
  • Dog Butte2,250 ft
  • Coffee Butte2,100 ft
  • Laundreaux Butte2,060 ft
All 9 towns in Dewey County by typical elevation
  1. Eagle Butte2,430 ft
  2. North Eagle Butte2,410 ft
  3. Isabel2,390 ft
  4. Lantry2,390 ft
  5. Timber Lake2,170 ft
  6. La Plant2,020 ft
  7. Green Grass1,920 ft
  8. Swift Bird1,840 ft
  9. Whitehorse1,710 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 2 arc-second (≈200 ft, 62 m) grid, coarsened from 1 arc-second so the whole area fits one run. Land means the boundary minus Census area water (on this grid, water areas of at least half a cell).
  • Highest and lowest: the highest land cell, re-read at 1 arc-second around the 25 highest grid cells. Lowest: the lowest land cell, re-read at 1 arc-second around the 25 lowest grid cells; 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.