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Custer County

County road alerts, weather impacts, closures, construction notices, and local safety resources for Custer County.

Official ITD traveler information

Idaho Travel Conditions

Idaho 511

Use the official Idaho 511 map for current road conditions, closures, traffic events, construction, cameras, weather stations, restrictions, and mountain-pass information near Custer County.

Official Idaho 511 WZDx work-zone alerts are shown in Road Alerts below. Broader Idaho 511 road conditions, cameras, passes, traffic events, and advisories will be added after the pending developer key is issued.

Road conditions

Road Alerts

0 active

No active road alerts

No active road alerts have been posted for Custer County yet.

Weather alerts

Weather Alerts / Red Flag Warnings

1 active
Weather alert High priority Source: National Weather Service

Red Flag Warning issued September 1 at 2:15AM MDT until September 1 at 9:00PM MDT by NWS Pocatello ID

Red Flag Warning for Custer County.

* AFFECTED AREA...Fire Weather Zone 422 Sawtooth Range/Northern
Sawtooth NF.

* IMPACTS...Scattered thunderstorms produce frequent dangerous
lightning over an area that can mean extreme initial attack
burdens for wildland fire fighting resources.

* THUNDERSTORMS...Scattered coverage during the afternoon and
evening period. Thunderstorms will during the late night hours
at isolated coverage.

* OUTFLOW WINDS...Gusts to 40 mph are possible.

A Red Flag Warning means that critical fire weather conditions
are either occurring now, or will shortly based on these criteria
for Southeastern Idaho:

- Thunderstorm coverage of 25 percent, without specific rainfall
criteria.
View source on National Weather Service
Public health

Health Dept Alerts

4 active
Health Dept alert High priority Source: Idaho Public Health District Notices

Rabid Bat Found in Custer County; Rabies is Fatal if Treatment is Not Administered after Exposure

Eastern Idaho Public Health posted an official public health notice on Aug 13, 2026: Rabid Bat Found in Custer County; Rabies is Fatal if Treatment is Not Administered after Exposure

Full Press Release Mackay, Idaho – Eastern Idaho Public Health has received laboratory confirmation of a rabid bat found in Mackay Idaho. Bats carrying rabies have been detected across Idaho, and Eastern Idaho sees at least one rabid bat every season. While most bats are harmless and do not carry rabies, they are the only […] The post Rabid Bat Found in Custer County; Rabies is Fatal if Treatment is Not Administered after Exposure appeared first on Eastern Idaho Public Health. Full Press Release Mackay, Idaho – Eastern Idaho Public Health has received laboratory confirmation of a rabid bat found in Mackay Idaho. Bats carrying rabies have been detected across Idaho, and Eastern Idaho sees at least one rabid bat every season. While most bats are harmless and do not carry rabies, they are the only animal in Idaho that is a natural reservoir for the virus. Rabies is a fatal viral illness in humans and other animals. Household pets and other animals can be exposed to the virus by playing with sick bats that can no longer fly normally. This is why it is important to ensure that household pets are vaccinated against rabies. Jordan Adam, Epidemiologist at Eastern Idaho Public Health (EIPH) states, “Bat bites or scratches can be very hard to see; they may not cause pain or leave blood. If you know or suspect that you came into contact with a bat, call your health care provider immediately. Rabies is fatal once symptoms start, but the vaccines are nearly 100% effective in preventing rabies infection.” To protect yourself and your pets, EIPH offers the following tips: Do not touch a bat with your bare hands. If you have had contact with a bat or wake up to find a bat in your room, seek medical advice immediately. The teeth of a bat are very small, and people are sometime
View source on Idaho Public Health District Notices
Health Dept alert High priority Source: Idaho Public Health District Notices

Rabid Bats Found in Bonneville and Jefferson Counties; Rabies is Fatal if Treatment is Not Administered after Exposure

Eastern Idaho Public Health posted an official public health notice on Aug 26, 2026: Rabid Bats Found in Bonneville and Jefferson Counties; Rabies is Fatal if Treatment is Not Administered after Exposure

This notice is displayed for every county served by Eastern Idaho Public Health because the source did not identify a single affected county. Full Press Release Eastern Idaho – Following two separate incidents where domestic pets encountered rabid bats in Idaho Falls and Rigby, local health officials are warning Eastern Idaho residents that rabies poses a serious threat to human and animal health. Because bat bites can go unnoticed, anyone who suspects they, a family member, or a […] The post Rabid Bats Found in Bonneville and Jefferson Counties; Rabies is Fatal if Treatment is Not Administered after Exposure appeared first on Eastern Idaho Public Health. Full Press Release Eastern Idaho – Following two separate incidents where domestic pets encountered rabid bats in Idaho Falls and Rigby, local health officials are warning Eastern Idaho residents that rabies poses a serious threat to human and animal health. Because bat bites can go unnoticed, anyone who suspects they, a family member, or a pet may have been exposed to a bat must seek immediate medical attention before symptoms develop. “It is essential to contact your health care provider immediately if you may have come into contact with a bat,” said Jordan McAdam, Epidemiologist at Eastern Idaho Public Health (EIPH). “If your pet has caught or played with a bat or other wild animal, contact your veterinarian immediately.” While the pets were exposed to infected bats, rabies is preventable in humans and domestic animals through immediate medical attention. Bats are the primary natural reservoir for the virus, and encounters increase in late summer/early fall. Dogs, cats, ferrets, and horses all require primary rabies vaccines and routine boosters every one to three years. Even indoor pets can be exposed if wildlife, such as bats, enter the home. To protect yourself and your pets, EIPH offers the following safety measures: Protect Beforehand:
View source on Idaho Public Health District Notices
Health Dept alert High priority Source: Idaho Department of Health and Welfare Public Health Notices

Statewide Idaho Alert: Idaho Public Health officials are investigating two outbreaks likely associated with raw milk

This is a State Wide Alert for Idaho. Idaho Department of Health and Welfare posted an official public health notice on Jun 3, 2026: Idaho Public Health officials are investigating two outbreaks likely associated with raw milk

This notice is displayed on every Idaho county page because it applies statewide. It does not mean the source identified a county-specific case, exposure, closure, or local outbreak in this county.

The Department of Health and Welfare (DHW) is working with local and state partners to investigate a recent increase in illnesses after consumption of unpasteurized (raw) milk. Since May 19, 2026, nearly 60 people have been identified who became ill after consuming raw milk.
View source on Idaho Department of Health and Welfare Public Health Notices
Health Dept alert High priority Source: Idaho Department of Health and Welfare Public Health Notices

Statewide Idaho Alert: Health advisories issued for Grasmere Reservoir and Bruneau Arm of CJ Strike

This is a State Wide Alert for Idaho. Idaho Department of Health and Welfare posted an official public health notice on Aug 21, 2026: Health advisories issued for Grasmere Reservoir and Bruneau Arm of CJ Strike

This notice is displayed on every Idaho county page because it applies statewide. It does not mean the source identified a county-specific case, exposure, closure, or local outbreak in this county.

The Department of Health and Welfare (DHW) is issuing health advisories for Grasmere Reservoir and the Bruneau Arm of CJ Strike, urging caution when recreating in or near the water. Grasmere Reservoir is about 35 miles south of Bruneau on State Highway 51.
View source on Idaho Department of Health and Welfare Public Health Notices
Fire & public safety

Fire & Safety Alerts

1 posted
Fire alert High priority Source: NIFC WFIGS Incident Locations

Doublesprings Fire

Doublesprings Fire listed by WFIGS in Custer County at 1,779 acres.

Reported size: 1,779 acres.
Containment: 35%.
Discovered: Jul 24, 2026 4:12 PM PDT.
Updated: Aug 31, 2026 3:26 PM PDT.
Description: 31 Miles NW from Mackay, ID.
Jurisdiction: USFS.
Protecting agency: USFS.
Dispatch center: IDCIC.
Fire cause: Natural.
Wildlife safety

Wildlife Safety Alerts

0 posted

No wildlife safety alerts

No official cougar, bear, wolf, or other dangerous wildlife alerts have been posted for Custer County.

For an immediate threat, call 911 or the nearest sheriff's office. For non-emergency wildlife conflicts, contact the nearest Idaho Fish and Game regional office.

Idaho Fish and Game wildlife safety news and alerts Report a wildlife conflict to Idaho Fish and Game Find an Idaho Fish and Game regional office Idaho wildlife management area access and closures Idaho wildlife reporting guidance
Local links

Resources

35 links