Middlesex County, CT Elevation & Topographic Map

Topographic elevation map of Middlesex County, Connecticut, shaded from sea level on Long Island Sound to 910 ft on the north side
Elevation
910 ft 275 m680 ft 210 m570 ft 175 m340 ft 105 m110 ft 35 m0 ft 0 m
Contours every 500 ft, bold every 2,500 ft
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

Middlesex County averages about 280 ft (85 m) above sea level across all its land. Its ground runs from sea level on Long Island Sound to 910 ft on the north side.

Average elevation
280 ft 85 m
all land inside the county
Highest
910 ft 275 m
on the north side
Lowest
0 ft 0 m
at sea level on Long Island Sound

Middlesex 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 land280 ft85 m
Highest point
Inside the county, on the north side
910 ft275 m
Lowest point
Where the land meets Long Island Sound
0 ft0 m

Elevation profile, south to north

14 mi south to north through Middletown.

Topographic Map

Topographic elevation map of Middlesex County, Connecticut, shaded from sea level on Long Island Sound to 910 ft on the north side
County boundary (dashed) over shaded terrain, with contours every 100 ft (30 m).
Location
County in Connecticut, United States
Population
167,398 2024 est., sum of towns
Land area
369.3 sq mi + 69.8 sq mi water
Density
453 per sq mi
Time zone
Eastern UTC−5 / −4
Landform region
New England
Drains to
Long Island Sound
Note
Connecticut replaced counties with planning regions for Census data in 2022; this page uses the 2020 county boundary.
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Sources: U.S. Census Bureau, USGS

Nearby Places

Neighboring historical counties sharing a border, by average

  1. Hartford County320 ft
  2. New Haven County310 ft
  3. Middlesex County280 ft
  4. New London County250 ft
  5. Suffolk County, NY73 ft

Rankings by average elevation

Peaks and hills highest inside

  • Clark Hill, Middlesex County890 ft
  • Meshomasic Mountain887 ft
  • Higby Mountain880 ft
  • Camels Hump830 ft
  • Gulf Hill800 ft
All 25 towns in Middlesex County by typical elevation
  1. Lake Pocotopaug610 ft
  2. East Hampton500 ft
  3. Killingworth370 ft
  4. East Haddam370 ft
  5. Haddam350 ft
  6. Durham340 ft
  7. Moodus310 ft
  8. Middlefield280 ft
  9. Higganum190 ft
  10. Portland170 ft
  11. Deep River150 ft
  12. Middletown130 ft
  13. Chester130 ft
  14. Cromwell130 ft
  15. Essex110 ft
  16. Chester Center110 ft
  17. Deep River Center77 ft
  18. Clinton60 ft
  19. Essex Village48 ft
  20. Westbrook34 ft
  21. Old Saybrook12 ft
  22. Westbrook Center12 ft
  23. Old Saybrook Center9 ft
  24. Saybrook Manor7 ft
  25. Fenwick1 ft
How we measure
  • Average: every USGS 3DEP bare-earth cell of land inside the Census county boundary (Census 2020), 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, −4 ft at 41.2610° N, 72.4621° W, is in such a hollow or patch and is not counted; this coastal land's lowest point is sea level on the coast.
  • Nearby Places: neighboring historical 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.
  • Population: the 2024 estimates of the towns that made up the county in 2020 (Census no longer estimates Connecticut's counties).
  • 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.