Lyman County, SD Elevation & Topographic Map

Topographic elevation map of Lyman County, South Dakota, shaded from 1,350 ft on the southeast side to 2,257 ft on Medicine Butte
Elevation
2,260 ft 690 m2,030 ft 620 m1,920 ft 585 m1,690 ft 515 m1,470 ft 445 m1,350 ft 415 m
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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

Lyman County averages about 1,780 ft (540 m) above sea level across all its land. Its ground runs from 1,350 ft on the southeast side to 2,257 ft on Medicine Butte.

Average elevation
1,780 ft 540 m
all land inside the county
Highest
2,257 ft 688 m
on Medicine Butte
Lowest
1,350 ft 415 m
on the southeast side

Lyman County spans about 910 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 land1,780 ft540 m
Highest point
Inside the county, on Medicine Butte (NGS survey height)
2,257 ft688 m
Lowest point
Inside the county, on the southeast side
1,350 ft415 m

Elevation profile, west to east

41 mi west to east through Lower Brule.

Topographic Map

Topographic elevation map of Lyman County, South Dakota, shaded from 1,350 ft on the southeast side to 2,257 ft on Medicine Butte
County boundary (dashed) over shaded terrain, with contours every 100 ft (30 m).
Location
County in South Dakota, United States
Population
3,721 2024 est.
Land area
1,642.3 sq mi + 64.6 sq mi water
Density
2.3 per sq mi
Time zone
Central UTC−6 / −5
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. Mellette County2,230 ft
  2. Tripp County2,090 ft
  3. Jones County2,070 ft
  4. Gregory County1,950 ft
  5. Stanley County1,890 ft
  6. Hyde County1,860 ft
  7. Lyman County1,780 ft
  8. Hughes County1,730 ft
  9. Brule County1,670 ft
  10. Buffalo County1,670 ft
  11. Charles Mix County1,560 ft

Rankings by average elevation

Peaks and hills highest inside

  • Medicine Butte2,257 ft
  • Twilight Butte2,230 ft
  • Stony Butte, Lyman County2,130 ft
  • Red Butte, Lyman County1,970 ft
  • Lewis Hill1,820 ft
All 13 towns in Lyman County by typical elevation
  1. Vivian Township1,900 ft
  2. Vivian1,900 ft
  3. Pratt Township1,820 ft
  4. Presho1,810 ft
  5. Iona Township1,780 ft
  6. Reliance1,780 ft
  7. West Brule1,770 ft
  8. Rex Township1,770 ft
  9. Bailey Township1,730 ft
  10. Kennebec1,690 ft
  11. Oacoma Township1,620 ft
  12. Lower Brule1,470 ft
  13. Oacoma1,400 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.
  • Highest ground: the single highest 3DEP cell, 2,240 ft at 44.1201° N, 100.3154° W, has no federal (GNIS) summit name within 980 ft (300 m), so the high point shown is the highest of the 25 highest cells with a GNIS summit within 1,640 ft (500 m).
  • 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.