Calhoun County, TX Elevation & Topographic Map
Elevation
77 ft 23 m58 ft 18 m48 ft 15 m29 ft 9 m10 ft 3 m0 ft 0 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
Calhoun County averages about 15 ft (5 m) above sea level across all its land. Its ground runs from sea level on the Gulf of America to 77 ft on the north side.
Average elevation
15 ft 5 m
all land inside the county
Highest
77 ft 23 m
on the north side
Lowest
0 ft 0 m
at sea level on the Gulf of America
Calhoun County spans about 77 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.
3% of Calhoun County's land lies below the average daily high tide (MHHW, NOAA), and 12% lies less than 3 ft above it. Check flood zones on FEMA's map
| Figure | Elevation |
|---|---|
| Average of all land | 15 ft5 m |
| Highest point Inside the county, on the north side | 77 ft23 m |
| Lowest point Where the land meets the Gulf of America | 0 ft0 m |
Elevation profile, west to east
34 mi west to east through Port Lavaca.
Topographic Map
- Location
- County in Texas, United States
- Population
- 19,942 2024 est.
- Land area
- 506.9 sq mi + 525.7 sq mi water
- Density
- 39 per sq mi
- Time zone
- Central UTC−6 / −5
- Landform region
- Coastal Plain 93%
- Drains to
- Gulf of America
⤓ Download this map
WebP, 1200 × 900. Free to use: credit “ElevationOf.com” with a link to this page.
Sources: U.S. Census Bureau, USGS
Nearby Places
Neighboring counties sharing a border, by average
- Victoria County90 ft
- Jackson County60 ft
- Refugio County44 ft
- Matagorda County28 ft
- Calhoun County15 ft
- Aransas County10 ft
Rankings by average elevation
- Counties in Texas250th highest of 254
- Counties in the United States3,102nd highest of 3,151
All 6 towns in Calhoun County by typical elevation
- Point Comfort20 ft
- Port Lavaca18 ft
- Alamo Beach12 ft
- Seadrift11 ft
- Magnolia Beach9 ft
- Port O'Connor8 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, −5 ft at 28.4276° N, 96.4474° 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 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; NOAA tidal surfaces (MHHW). All public domain.