St. Clair County, AL Elevation & Topographic Map
Elevation
1,560 ft 475 m1,270 ft 390 m1,130 ft 345 m830 ft 255 m540 ft 165 m400 ft 120 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
St. Clair County averages about 690 ft (210 m) above sea level across all its land. Its ground runs from 400 ft on the south side to 1,560 ft on Bald Rock Mountain.
Average elevation
690 ft 210 m
all land inside the county
Highest
1,560 ft 475 m
on Bald Rock Mountain
Lowest
400 ft 120 m
on the south side
St. Clair County spans about 1,160 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.
| Figure | Elevation |
|---|---|
| Average of all land | 690 ft210 m |
| Highest point Inside the county, on Bald Rock Mountain (3DEP terrain model; no NGS survey height) | 1,560 ft475 m |
| Lowest point Inside the county, on the south side | 400 ft120 m |
Elevation profile, south to north
33 mi south to north through Pell City.
Topographic Map
- Location
- County in Alabama, United States
- Population
- 96,927 2024 est.
- Land area
- 631.6 sq mi + 21.7 sq mi water
- Density
- 153 per sq mi
- Time zone
- Central UTC−6 / −5
- Landform region
- Valley and Ridge 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
- Blount County790 ft
- Etowah County760 ft
- Calhoun County750 ft
- St. Clair County690 ft
- Talladega County620 ft
- Jefferson County580 ft
- Shelby County560 ft
Rankings by average elevation
- Counties in Alabama18th highest of 67
- Counties in the United States2,050th highest of 3,151
Peaks and hills highest inside
- Bald Rock Mountain1,560 ft
- Cahaba Mountain1,515 ft
- Chandler Mountain1,490 ft
- Saint Clair Mountain1,369 ft
- High Point, St. Clair County1,360 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; it is a named summit, so its height is the peak method: the 3DEP top on a ~7 ft (2 m) window, or the NGS published height when a survey mark sits within 160 ft (50 m) of it. 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, 300 ft at 33.7335° N, 86.1199° 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.