St. Clair County, MI Elevation & Topographic Map

Topographic elevation map of St. Clair County, Michigan, shaded from 570 ft on the south side to 880 ft on the northwest side
Elevation
880 ft 270 m800 ft 245 m770 ft 235 m690 ft 210 m610 ft 185 m570 ft 175 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

St. Clair County averages about 700 ft (215 m) above sea level across all its land. Its ground runs from 570 ft on the south side to 880 ft on the northwest side.

Average elevation
700 ft 215 m
all land inside the county
Highest
880 ft 270 m
on the northwest side
Lowest
570 ft 175 m
on the south side

St. Clair County spans about 310 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 land700 ft215 m
Highest point
Inside the county, on the northwest side
880 ft270 m
Lowest point
Inside the county, on the south side
570 ft175 m

Elevation profile, west to east

29 mi west to east through Port Huron.

Topographic Map

Topographic elevation map of St. Clair County, Michigan, shaded from 570 ft on the south side to 880 ft on the northwest side
County boundary (dashed) over shaded terrain, with contours every 40 ft (12 m).
Location
County in Michigan, United States
Population
160,308 2024 est.
Land area
721.5 sq mi + 115.0 sq mi water
Density
222 per sq mi
Time zone
Eastern UTC−5 / −4
Landform region
Central Lowland 98%
Drains to
Great Lakes
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Sources: U.S. Census Bureau, USGS

Nearby Places

Neighboring counties sharing a border, by average

  1. Lapeer County870 ft
  2. Sanilac County770 ft
  3. St. Clair County700 ft
  4. Macomb County680 ft

Rankings by average elevation

All 36 towns in St. Clair County by typical elevation
  1. Mussey Township810 ft
  2. Capac810 ft
  3. Brockway Township800 ft
  4. Yale800 ft
  5. Lynn Township800 ft
  6. Berlin Township, St. Clair County800 ft
  7. Emmett Township, St. Clair County790 ft
  8. Riley Township780 ft
  9. Emmett770 ft
  10. Memphis partly760 ft
  11. Greenwood Township750 ft
  12. Kenockee Township740 ft
  13. Richmond partly730 ft
  14. Grant Township, St. Clair County720 ft
  15. Wales Township700 ft
  16. Ruby700 ft
  17. Clyde Township680 ft
  18. Columbus Township660 ft
  19. Kimball Township640 ft
  20. Casco Township640 ft
  21. St. Clair Township630 ft
  22. Port Huron Township620 ft
  23. China Township610 ft
  24. Marysville610 ft
  25. Fort Gratiot Township610 ft
  26. St. Clair610 ft
  27. Burtchville Township600 ft
  28. Port Huron600 ft
  29. Lakeport600 ft
  30. Cottrellville Township590 ft
  31. Ira Township590 ft
  32. East China Township590 ft
  33. Marine City580 ft
  34. Algonac580 ft
  35. Pearl Beach580 ft
  36. Clay Township580 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. Lowest: the lowest land cell; coastal ground within 3 ft (1 m) of named tidal water counts as sea level.
  • Pits: the lowest point is the lowest ground outside closed hollows (quarry floors, mine pits, terrain-model artifacts): any hollow under 0.4 sq mi (1 km²), and any hollow under 2 sq mi (5 km²) whose floor is more than 100 ft (30 m) below its rim; and outside patches below sea level of under 0.4 sq mi (1 km²). The single lowest 3DEP cell, 560 ft at 42.9601° N, 82.4332° W, is in such a hollow or patch and is not counted.
  • 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.