Lemhi County, ID Elevation & Topographic Map
Elevation
11,620 ft 3,540 m9,430 ft 2,875 m8,340 ft 2,540 m6,160 ft 1,875 m3,970 ft 1,210 m2,880 ft 875 m
Zoom in for contour lines
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
Lemhi County averages about 6,930 ft (2,110 m) above sea level across all its land. Its ground runs from 2,880 ft on the northwest side to 11,617 ft on Bell Mountain.
Average elevation
6,930 ft 2,110 m
all land inside the county
Highest
11,617 ft 3,541 m
on Bell Mountain
Lowest
2,880 ft 875 m
on the northwest side
Lemhi County spans about 8,740 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 | 6,930 ft2,110 m |
| Highest point Inside the county, on Bell Mountain (NGS survey height) | 11,617 ft3,541 m |
| Lowest point Inside the county, on the northwest side | 2,880 ft875 m |
Elevation profile, south to north
75 mi south to north through Salmon.
Topographic Map
- Location
- County in Idaho, United States
- Population
- 8,397 2024 est.
- Land area
- 4,563.7 sq mi + 5.4 sq mi water
- Density
- 1.8 per sq mi
- Time zone
- Mountain UTC−7 / −6
- Landform region
- Northern Rocky Mountains
- Drains to
- Pacific Ocean 92%
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Sources: U.S. Census Bureau, USGS
Nearby Places
Neighboring counties sharing a border, by average
- Custer County7,600 ft
- Beaverhead County, MT7,070 ft
- Lemhi County6,930 ft
- Valley County6,510 ft
- Clark County6,450 ft
- Butte County5,990 ft
- Ravalli County, MT5,890 ft
- Idaho County5,120 ft
Rankings by average elevation
- Counties in Idaho2nd highest of 44
- Counties in the United States66th highest of 3,151
Peaks and hills highest inside
- Bell Mountain11,617 ft
- Scott Peak11,400 ft
- Big Creek Peak11,355 ft
- Eighteenmile Peak11,120 ft
- Lem Peak10,990 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 3 arc-second (≈300 ft, 93 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; 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, 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.
- 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.