News & Press Releases

Thursday, June 07, 2012
Ironman event in Boise to bring impacts to local and state roads this Saturday

Boise- This year’s Ironman 70.3 will bring more than 1,500 athletes competing in swimming, biking and running events, to parts of downtown, south and southeast Boise on Saturday (June 9). Traffic delays, road closures and detours should be expected along multiple ACHD and 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 some 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 to downtown Boise. 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.Two closures will go into effect before Saturday.

Pre-Race/Extended Closures

• 8th Street between Broad Street and Front Street
o Closed from 8 a.m. Thursday, June 7th to 8 a.m., Sunday, June 10th
• Capitol Boulevard between Myrtle Street and Front Street
o Closed from 6 p.m. on Friday, June 8th to 2 a.m., Sunday, June 10th

Race Day Closures (Includes ACHD and ITD roads)
• Front Street between Capitol Boulevard and 9th Street 
   o Closed between 8 a.m. and 12 a.m.
• Myrtle Street between 11th Street and Capitol Boulevard
   o Closed between 1 p.m. and 12 a.m.
• Interstate 84 ~ Eisenman Interchange (Exit 60)
   o Closed between 12:30 p.m. and 5 p.m.
   - Westbound traffic will use Exit 57 (Gowen Road Interchange)
   - Eastbound traffic will use Exit 54 (Broadway Avenue Interchange)
• S. Eisenman Road between I-84 and Factory Outlet
   o Closed between 12:30 p.m. and 4:45 p.m.
• Pleasant Valley Road between Gowen Road and Ten Mile Creek Road
   o Closed between 12:30 p.m. and 4:45 p.m.
• Ten Mile Creek Road between Pleasant Valley Road and South Cole Road
   o Closed between 1 p.m. and 4:30 p.m.
• Federal Way and South Capitol Boulevard between Protest Road and Myrtle Street
   o Closed between 2 p.m. and 6:20 p.m.
• Broad Street, South Capitol to 9th Street
   o Closed between 1 p.m. and 12 a.m. (Sunday)

Expect Delays or Detours (Includes ACHD and ITD roads)
• Bown Way between ParkCenter Boulevard and Boise Avenue
   o Expect delays between 1:30 p.m. and 5:45 p.m.
• Boise Avenue between Bown Way and Holcomb Road
   o Expect delays between 1:30 p.m. and 5:45 p.m.
• Warm Springs Avenue/ParkCenter Boulevard between East Warm Springs Boulevard and Harris Ranch Road 
   o Expect detours between 1:30 p.m. and 5:45 p.m.
• Federal Way between East Bergeson Street and Protest Road
   o Expect lane restrictions between 2 p.m. and 6:10 p.m. - this is part of the bike route
• Boise Avenue between Bown Way and Holcomb Road
   o Expect delays between 1:30 p.m. and 5:45 p.m.

Directional Impacts (Includes ACHD and ITD roads)
• State Highway 21 
   o Beginning at 11:30 a.m., southbound SH-21 will be detoured onto Grand Forest Drive, returning to Idaho 21 at its junction with Technology Way. 
   o Northbound traffic will be temporarily shifted into the southbound lanes.
   o SH-21 between Grand Forest Drive and Diversion Dam will be restricted to one lane with a flagger; traffic will be guided by a pilot car one direction at a time.
   o SH-21 between Diversion Dam and the top of Lucky Peak will be restricted to one lane in each direction.
• Gowen Road between South Eisenman Road and Pleasant Valley Road
   o Westbound-only traffic allowed between 12:30 and 4:45 p.m.
• Warm Springs Avenue between State Highway 21 and Bown Way
   o Northbound-only traffic allowed between 1:30 p.m. and 5:40 p.m.
• Holcomb Road/Bergeson Street between Boise Avenue and Federal Way
   o Eastbound-only traffic allowed between 1:30 p.m. and 6 p.m.

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