Lost River

Featured view

Lost River

Total population

55

Median home value

$0

30.8%

Bachelor's+

Median income

$0

Weather68°F · Sunny

Coordinates43.69°, -113.64°

Demographic figures from US Census Bureau · ACS 5-year estimates. Overview below cites Wikipedia and may reference a different year.

Overview

Lost River is a city in Custer County, Idaho, United States. The population was 42 persons at the 2020 census.

History & geography

Excerpted from the corresponding Wikipedia article (CC BY-SA).

Demographics & economy

Source: US Census Bureau — American Community Survey, 5-year estimates.

Geography

Coordinates & boundaries from the US Census TIGER/Line shapefiles.

Current forecast

Forecast for Lost River, ID from NOAA NWS API.

Wildlife & biodiversity

Citizen-science & research observations from the Global Biodiversity Information Facility (GBIF).

Earthquake history

Events from the USGS Earthquake Catalog (global) (FDSN Event Web Service).

Nearby places in Idaho

• Moore
  13.8 mi away · pop. 228
• Mackay
  15.5 mi away · pop. 602
• Arco
  17.2 mi away
• Butte City
  20.5 mi away · pop. 95
• Carey
  30.2 mi away · pop. 1,196
• Bellevue
  34.5 mi away · pop. 2,588
• Sun Valley
  34.9 mi away · pop. 1,460
• Gannett
  35.4 mi away
• Hailey
  35.4 mi away
• Ketchum
  37.2 mi away
• Richfield
  51.2 mi away
• Clayton
  54.2 mi away

Browse all places in Idaho →

Geography & sun

Elevation, sunrise/sunset and daylight from Open-Meteo. Solar climatology from NASA POWER.

Public attention

Pageview totals from the Wikimedia Pageviews API.

Books about Lost River

Irrigation in valley of Lost River, Idaho

1904

Irrigation in the valley of Lost River, Idaho

United States. Department of Agriculture. National Agricultural Library. · 1904

Estimated 100-year peak flows and flow volumes in the Big Lost River and Birch Creek at the Idaho National Engineering Laboratory, Idaho

L. C. Kjelstrom · 1996

Preliminary water-surface elevations and boundary of the 100-year peak flow in the Big Lost River at the Idaho National Engineering and Environmental Laboratory, Idaho

Charles Berenbrock · 1998

A promontory pottery find at the foot of the Lost River Range in eastern Idaho

B. Robert Butler · 1979

Geochemistry of the Big Lost River drainage basin, Idaho

2001

Geochemistry of the Little Lost River drainage basin, Idaho

2002

Three Forks fauna in the Lost River range, Idaho

Ewart Merlin Baldwin · 1943

Search results from Open Library.

Recent natural events nearby

• Wildfire Shale Butte, Lincoln, Idaho
  Wildfires · 2026-08-22 · 51 mi
• Wildfire Lake Channel, Power, Idaho
  Wildfires · 2026-07-29 · 77 mi
• Wildfire North Heglar, Cassia, Idaho
  Wildfires · 2026-08-19 · 87 mi
• Wildfire Roe 2, Beaverhead, Montana
  Wildfires · 2026-08-27 · 95 mi
• Wildfire CROOKED, Boise, Idaho
  Wildfires · 2026-08-18 · 96 mi
• Wildfire Big Rock, Jefferson, Idaho
  Wildfires · 2026-07-31 · 99 mi
• Wildfire Sand Creek, Beaverhead, Montana
  Wildfires · 2026-08-01 · 130 mi
• Wildfire Bobcat Lakes, Beaverhead, Montana
  Wildfires · 2026-07-31 · 136 mi

Wildfires, storms and other events from NASA EONET (last 12 months, within 250 mi).

Recently spotted species

matted wild buckwheat

Eriogonum caespitosum

Seen 2026-05-15

Plains Pricklypear

Opuntia polyacantha

Seen 2026-02-27

Callippe Fritillary

Argynnis callippe

Seen 2025-08-04

Yellow Sweetclover

Melilotus officinalis

Seen 2025-08-03

Black Medick

Medicago lupulina

Seen 2025-08-03

poverty weed

Iva axillaris

Seen 2025-08-03

Research-grade observations from iNaturalist (within ~15 mi).

Nearest stream gauge

Live readings from USGS NWIS · measured 2026-09-21 10:00 UTC.