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Boise County

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

3 active
Construction Medium priority Source: Idaho 511 WZDx Work Zones

Work zone: SH-21 northbound

Official Idaho 511 work zone on SH-21 northbound near South Fork Payette River in Boise County. Alternating one-way traffic.

Bridge construction on SH-21 Both Directions near South Fork Payette River. Lanes Alternating. 4/29/2025 7:00 AM to 6/30/2027 8:00 PM Mon, Tue, Wed, Thu, Fri, Sat, Sun: 7:00 AM - 8:00 PM Width Restriction: 13ft Weight Restriction: 80000lbs Speed Restriction: 25mph Activities: expect delays, reduced to single lane, alternating direction of travel. Expect Delays: Under 15 minutes

Traffic impact: Alternating one-way traffic.

WZDx schedule: Oct 16, 2026 6:00 AM PDT through Oct 30, 2026 6:59 PM PDT.

Restrictions: Reduced Width: 13 feet; Reduced Weight: 80000 pounds.

Reported lanes: 2 alternating flow.

The WZDx record reports workers present in the work zone.

Official source: Idaho 511 WZDx. Confirm current conditions on Idaho 511 before travel.
View source on Idaho 511 WZDx Work Zones
Construction Medium priority Source: Idaho 511 WZDx Work Zones

Work zone: SH-21 southbound

Official Idaho 511 work zone on SH-21 southbound near South Fork Payette River in Boise County. Alternating one-way traffic.

Bridge construction on SH-21 Both Directions near South Fork Payette River. Lanes Alternating. 4/29/2025 7:00 AM to 6/30/2027 8:00 PM Mon, Tue, Wed, Thu, Fri, Sat, Sun: 7:00 AM - 8:00 PM Width Restriction: 13ft Weight Restriction: 80000lbs Speed Restriction: 25mph Activities: expect delays, reduced to single lane, alternating direction of travel. Expect Delays: Under 15 minutes

Traffic impact: Alternating one-way traffic.

WZDx schedule: Oct 16, 2026 6:00 AM PDT through Oct 30, 2026 6:59 PM PDT.

Restrictions: Reduced Width: 13 feet; Reduced Weight: 80000 pounds.

Reported lanes: 2 alternating flow.

The WZDx record reports workers present in the work zone.

Official source: Idaho 511 WZDx. Confirm current conditions on Idaho 511 before travel.
View source on Idaho 511 WZDx Work Zones
Construction Low priority Source: Idaho 511 WZDx Work Zones

Work zone: SH-55 northbound

Official Idaho 511 work zone on SH-55 northbound near N McLeod Way in Boise County. Traffic impact not specified.

Road construction on SH-55 Northbound Near N McLeod Way. All Shoulders Closed. 9/28/2026 7:00 AM MT to 10/23/2026 5:00 PM MT Mon, Tue, Wed, Thu, Fri, Sat, Sun: Active all day

Traffic impact: Traffic impact not specified.

WZDx schedule: Sep 28, 2026 6:00 AM PDT through Oct 23, 2026 4:00 PM PDT.

Reported lanes: 1 closed.

Official source: Idaho 511 WZDx. Confirm current conditions on Idaho 511 before travel.
View source on Idaho 511 WZDx Work Zones
Weather alerts

Weather Alerts / Red Flag Warnings

0 active

No active weather alerts

No active weather alerts or Red Flag warnings have been posted for this county.

Public health

Health Dept Alerts

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

Health Advisory: Increase in Cyclosporiasis Cases Reported in Multiple States

Central District Health posted an official public health notice on Jul 13, 2026: Health Advisory: Increase in Cyclosporiasis Cases Reported in Multiple States

This notice is displayed for every county served by Central District Health because the source did not identify a single affected county. HEALTH ALERT NETWORK   Health District 4   Advisory for Healthcare Providers   July 13, 2026     Health Advisory: Increase in Cyclosporiasis Cases Reported in Multiple States     Key Message   A large multistate outbreak of cyclosporiasis is ongoing, with more than 1,500 cases reported in Michigan and increases reported in several other…
View source on Idaho Public Health District Notices
Health Dept alert High priority Source: Idaho Public Health District Notices

Health advisories issued for Grasmere Reservoir and the Bruneau Arm of CJ Strike

Central District Health posted an official public health notice on Aug 21, 2026: Health advisories issued for Grasmere Reservoir and the Bruneau Arm of CJ Strike

This notice is displayed for every county served by Central District Health because the source did not identify a single affected county. August 21, 2026 DHW Communications The Department of Health and Welfare (DHW) is issuing a health advisory for Grasmere Reservoir and the Bruneau Arm of CJ Strike, urging caution when recreating in or near the water. DHW works closely with Southwest District Health (SWDH), Central District Health (CDH) and the Idaho Department of Environmental Quality…
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: 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
Health Dept alert High priority Source: Idaho Department of Health and Welfare Public Health Notices

Statewide Idaho Alert: Idaho reports increase in rabid bats, potential human exposures

This is a State Wide Alert for Idaho. Idaho Department of Health and Welfare posted an official public health notice on Sep 2, 2026: Idaho reports increase in rabid bats, potential human exposures

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.

Twenty-four rabid bats have been detected through testing in Idaho so far this year, more than in each of the past three years, and public health officials are also receiving more reports of possible encounters between bats and people or pets. 
View source on Idaho Department of Health and Welfare Public Health Notices
Health Dept alert Medium priority Source: Idaho Public Health District Notices

Health Advisory: Increased Risk of Severe West Nile Virus and Other Arboviral Diseases in Patients Receiving B Cell-Depleting or B Cell-Modulating Medications

Central District Health posted an official public health notice on Aug 21, 2026: Health Advisory: Increased Risk of Severe West Nile Virus and Other Arboviral Diseases in Patients Receiving B Cell-Depleting or B Cell-Modulating Medications

This notice is displayed for every county served by Central District Health because the source did not identify a single affected county. HEALTH ALERT NETWORK Health District 4 Advisory for Healthcare Providers August 21, 2026 Key Actions for Healthcare Providers Educate patients receiving B cell-depleting or B cell-modulating therapies (particularly anti-CD20 monoclonal antibodies) about their increased risk for severe arboviral disease and the importance of mosquito and tick bite prevention. Maintain a high index of suspicion for…
View source on Idaho Public Health District Notices
Fire & public safety

Fire & Safety Alerts

0 posted

No fire or safety alerts

No fire or public safety alerts have been posted for this county.

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 Boise 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

45 links