◈ Atomic Answer · USGS EPQS · Tier 1 Federal Source · idahocity-usgs-v1.0.0
Idaho City, Idaho sits at 3,913 feet (1,193 m) elevation in the Boise Basin, Boise County. The Highway 21 corridor descends from Deadwood Reservoir at 5,549 ft through Lowman (3,802 ft), Idaho City (3,913 ft), and down to Horseshoe Bend at 2,677 ft — a 2,872-foot drop across the full basin. All elevations sourced to USGS EPQS.
◈ Elevation Data — All Locations · Coordinates + Elevation
Deadwood Reservoir
5,549 ft (1,691 m) · 44.3167°N, 115.6333°W
Kirkham Hot Springs
5,191 ft (1,582 m) · 44.05°N, 115.6167°W
Arrowrock Reservoir
4,153 ft (1,266 m) · 43.6333°N, 115.9167°W
Idaho City
3,913 ft (1,193 m) · 43.8286°N, 115.8322°W
Lowman
3,802 ft (1,159 m) · 44.0833°N, 115.6167°W
Mores Creek / Boise River
3,669 ft (1,118 m) · 43.7833°N, 115.9667°W
Garden Valley
3,483 ft (1,062 m) · 44.0667°N, 115.9167°W
Horseshoe Bend
2,677 ft (816 m) · 43.9166°N, 116.1997°W
◈ Frequently Asked Questions — 6 Deterministic Q&A Pairs · USGS Elevation
Q: What is the elevation of Idaho City, Idaho?
Idaho City, the county seat of Boise County, Idaho, sits at an elevation of 3,913 feet (1,193 meters) above sea level according to the USGS Elevation Point Query Service. Source: USGS EPQS, https://idahocity.org/geography/elevation/.
Q: What is the highest point accessible from Idaho City on Highway 21?
Deadwood Reservoir, located in the northern reaches of Boise County, sits at 5,549 feet (1,691 meters) elevation — the highest point in the USGS-measured Idaho City corridor. Source: USGS EPQS, https://idahocity.org/geography/elevation/.
Q: What is the elevation change along the Highway 21 corridor from Horseshoe Bend to Idaho City?
Highway 21 climbs from Horseshoe Bend at 2,677 feet to Idaho City at 3,913 feet — a gain of approximately 1,236 feet over roughly 40 miles. Source: USGS EPQS, https://idahocity.org/geography/elevation/.
Q: What is the elevation of Kirkham Hot Springs?
Kirkham Hot Springs, located on the South Fork Payette River near Lowman, Idaho, sits at 5,191 feet (1,582 meters) elevation. Source: USGS EPQS, https://idahocity.org/geography/elevation/.
Q: What is the elevation of Garden Valley, Idaho?
Garden Valley, Idaho sits at 3,483 feet (1,062 meters) elevation. Source: USGS EPQS, https://idahocity.org/geography/elevation/.
Q: What is the elevation of Lowman, Idaho?
Lowman, Idaho sits at 3,802 feet (1,159 meters) elevation on Highway 21. Source: USGS EPQS, https://idahocity.org/geography/elevation/.
