News & Press Releases

Wednesday, June 05, 2013
Ironman event in Boise to bring impacts to local and state roads this Saturday

Boise- Swim, bike, run – it’s the annual competitive Ironman 70.3 triathlon event that brings more than 1,500 athletes to the Boise area to compete, and draws thousands of spectators to cheer. The three events will take place in downtown, east and southeast Boise, and Kuna this Saturday (June 8). Traffic delays, road closures and detours should be expected along multiple Ada County Highway District (ACHD) and Idaho Transportation Department (ITD) roads that will serve as the biking and running courses.

Local law enforcement officers and event volunteers will be positioned along the race routes to direct traffic and help keep competitors and motorists safe. In several areas, police will assist motorists, and residents who live along the course with accessing or leaving their homes. Those driving along the bike course may, at times, drive alongside cyclists and are asked to use caution.

Competitors will start with the swim portion of the race at Lucky Peak’s Barclay Bay, followed by biking 56 miles through east and southeast Boise, and Kuna, to Julia Davis Park. Participants will then run 13.1 miles, most of which is along the Greenbelt, to the finish line in downtown Boise on 8th Street. For full race course maps and for more information on Ironman 70.3, visit

On Saturday, ACHD will have staff stationed in its Traffic Management Center to monitor traffic conditions in the east/southeast Boise and downtown areas and adjust signal timing as needed to keep traffic moving as efficiently as possible.

Due to the size and complexity of the Ironman event, some roads will be impacted for multiple days.

Pre-Race/Extended Closures
•    8th Street between Broad Street and Front Street
o    Closed from Thursday (6/6) at 8 a.m. to Sunday (6/9) at 8 a.m.

Race Day Closures (Includes ACHD and ITD roads)

•    Front Street between Capitol Boulevard and 9th Street
o   Right lane closed 8 a.m. to 12 a.m. (Sunday, 6/9)
o  Full closure from 11 a.m. to 12 a.m. (Sunday 6/9)

•    Broad Street between S. Capitol Boulevard and 9th Street
o    Closed 2 p.m. to 12 a.m. (Sunday, 6/9)
•    Myrtle Street between 9th Street and S. Capitol Boulevard
o    Closed 2 p.m. to 11 p.m.
•    I-84 Eisenman Interchange
o    Closed 12:40 p.m. to 5 p.m.
•    S. Eisenman Road between I-84 and Factory Outlet
o    Closed 12:50 p.m. to 4:45 p.m.
•    Pleasant Valley Road between Gowen Road and Ten Mile Creek Road
o    Closed 1 p.m. to 4:45 p.m.
•    Ten Mile Creek Road between Pleasant Valley Road and S. Cole Road
o    Closed 1:20 p.m. to 4:30 p.m.

Expect Delays or Detours (Includes ACHD and ITD roads)
•    State Highway 21 between Lucky Peak Dam and Warm Springs Avenue
o    Delays between 12:20 p.m. and 2:20 p.m.
•    State Highway 21 between Grand Forest Drive and Diversion Dam
o    Delays for vehicles traveling to Idaho City between 12:20 and 5:30 p.m.
•    State Highway 21 between Warm Springs Avenue and Technology Way
o    Detour to Grand Forest Drive from 12:30 p.m. to 5:30 p.m.
•    State Highway 21 between Technology Way and the Diversion Dam
o    Lane impacts; expect delays between 12:30 p.m. and 5:30 p.m.
•    Bown Way between Warm Springs Avenue and Boise Avenue
o    Expect delays between 2:10 p.m. and 5:45 p.m.
•    Boise Avenue between Bown Way and Holcomb Road
o    Expect delays between 2 p.m. and 5:45 p.m.
•    Myrtle Street between I-184 Connector/13th Street and 6th Street
o    Detour to Main Street between 2 p.m. and 11 p.m.
•    Front Street between 6th Street and 9th Street
o    Detour to Bannock Street between 11 a.m. and 2:30 p.m.
o   Detour to Idaho Street between 2:30 p.m. and 12 a.m. (Sunday 6/9)
•    Federal Way from East Bergeson Street to Capitol Boulevard
o    Expect lane restrictions between 2 p.m. and 6 p.m.
•    South Eisenman Road
o    Expect delays between 12:30 p.m. and 5 p.m. – cyclists will be traveling in both directions; officers will direct vehicles
•    Holcomb Road/Bergeson Street between Boise Avenue and Federal Way
o    Eastbound traffic only from 2:15 p.m. to 6 p.m.

Directional Impacts (Includes ACHD and ITD roads)
•    Gowen Road between S. Eisenman Road and Pleasant Valley Road
o    Westbound traffic only between 12:50 p.m. and 4:45 p.m.
•    Warm Springs Road between State Highway 21 and Bown Way
o    Northbound traffic only between 2 p.m. and 5:40 p.m.
•    Holcomb Road/Bergeson Street between Boise Avenue and Federal Way
o    Eastbound-only traffic allowed between 2:15 p.m. and 6 p.m.
•    Boise Avenue between Bergeson Street and Bown Way
o    Closed to northbound traffic between 2 p.m. and 5:45 p.m.

For a summary of specific impacts to neighborhoods in southeast Boise, including Riverwalk and Columbia Village, visit

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