Post Mountain, CA Elevation & Topographic Map
Elevation
4,020 ft 1,225 m3,690 ft 1,125 m3,520 ft 1,075 m3,180 ft 970 m2,850 ft 870 m2,680 ft 815 m
Contours every 100 ft, bold every 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.
- Area
- Fades everything outside the official CDP boundary (US Census).
Elevation Data
Post Mountain sits at about 3,440 ft (1,050 m) above sea level, worked out from 2020 Census block heights on USGS 3DEP, weighted by residents.
Typical elevation
3,440 ft 1,050 m
most residents: 3,400–3,680 ft
Lowest
2,680 ft 815 m
on the southwest side
Highest
4,020 ft 1,225 m
on the east edge, below higher ground just outside
Average
3,430 ft 1,045 m
all land inside the CDP boundary
Post Mountain spans about 1,340 ft of height, so no single spot tells the whole story. The ruler shows where its people live, and where the other numbers you'll see come from.
| Figure | Elevation |
|---|---|
| Typical Where people live: half of residents higher, half lower | 3,440 ft1,050 m |
| Highest point Inside the CDP boundary, on the east edge, below higher ground just outside | 4,020 ft1,225 m |
| Lowest point Inside the CDP boundary, on the southwest side | 2,680 ft815 m |
| Town center USGS map point for Post Mountain | 3,250 ft990 m |
| Airport (F62) FAA airport elevation, the highest point of its runways, 7.1 mi north of the CDP boundary | 2,334 ft711 m |
| Average of all land | 3,430 ft1,045 m |
| Nearest peak Chinquapin Butte, 8.9 mi south of the CDP boundary (NGS survey) | 6,073 ft1,851 m |
Elevation profile, west to east
4.4 mi west to east through the town center.
Altitude Effects
What 3,440 ft means day to day, worked out from the typical elevation.
Water boils at
205.6 °F96.5 °C
vs 212 °F at sea level; USDA: food takes longer to cook.
Air pressure
88% of sea level
26.4 inHg (89.4 kPa): each breath holds 12% less air.
Oxygen equivalent
18.5% at sea level
Air is still 21% oxygen, just thinner. Normal at the coast: 20.9%.
Sunburn
+7% more UV
EPA: UV rises about 2% for every 1,000 ft.
Topographic Map
- Location
- Unincorporated community (census-designated place) in Trinity County, California, United States
- Population
- 3,032 2020 Census
- Land area
- 12.4 sq mi
- Density
- 244 per sq mi
- Coordinates
- 40.4227° N, 123.2224° W
- Time zone
- Pacific UTC−8 / −7
- Landform region
- Pacific Border
- Drains to
- South Fork Trinity River → Trinity River → Klamath River → Pacific Ocean
- Airport
- Hayfork (F62) 2,334 ft
- ZIP codes 1
- 96041
⤓ Download this map
WebP, 1200 × 900. Free to use: credit “ElevationOf.com” with a link to this page.
Sources: U.S. Census Bureau, USGS, FAA
Nearby Places
Nearby towns by typical elevation
- Post Mountain3,440 ft
- Mad River2,910 ft
- Ruth2,830 ft
- Platina2,540 ft
- Hayfork2,430 ft
- Weaverville2,170 ft
- Douglas City2,150 ft
- Lewiston2,010 ft
- Junction City1,660 ft
- Hyampom1,550 ft
- Alderpoint480 ft
Rankings by typical elevation
- Towns in California211th highest of 1,622
- Towns in Trinity Countyhighest of 14
Peaks and hills nearest, by height
- Chanchelulla Peak6,400 ft
- Hayfork Bally6,273 ft
- Chinquapin Butte6,073 ft
- Signal Peak5,820 ft
- Wells Mountain5,452 ft
How we measure
- Typical elevation: the population-weighted median: every 2020 Census block inside the CDP boundary, at its USGS 3DEP height, weighted by the people who live there. Half of residents live higher, half lower.
- Lowest, highest, average: USGS 3DEP bare-earth heights on a 1 arc-second (≈100 ft, 30 m) grid, land only, inside the Census CDP boundary (TIGER, Jan 1 2026).
- Nearby Places: nearby towns and rankings use each town's typical elevation, so every town is compared like for like. Rankings count every city, town, township and census-designated place, including places inside a town. Peaks and hills: the nearest summits with at least 980 ft (300 m) of prominence within 62 mi (100 km), then federal (GNIS) summits within 16 mi (25 km) 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).
- Altitude effects: standard-atmosphere formulas applied to the typical elevation; UV from EPA's rule of thumb (about 2% per 1,000 ft).
- 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 (FAA airport elevation, 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.
- Post Mountain is an unincorporated community; figures cover the census-designated place, a statistical area.
- Sources: USGS 3DEP, GNIS, Watershed Boundary Dataset and physiographic provinces; U.S. Census Bureau (boundaries, 2020 blocks, Gazetteer areas, ZIP code areas); FAA airport data; BTS time zones; NOAA NGS survey heights. All public domain.