BOULDER - The city of Boulder is planning road closures and restricting access to open space beginning Friday, Aug. 24, as the city hosts stage 6 of the USA Pro Cycling Challenge on Saturday, Aug. 25.

Boulder officials are asking residents to be aware of when and where road and facility closures will occur during the event.

The following city facilities, trail areas and roads will be closed for the event:

Friday Aug. 24

Flagstaff Open Space area: Beginning at 5 a.m., there will be no parking along Flagstaff Road from Sixth Street to the 5-mile marker (Bison Drive) to allow for the set-up of race-related infrastructure.

After 5 p.m., there will be no public access to the Open Space and Mountain Parks properties in the Flagstaff area. This closure includes all property and trails west of Sixth Street, north of Gregory Canyon (including the Gregory Canyon trail), south of Boulder Canyon and east of Chapman Drive.

Starting at 5 p.m., the only vehicles allowed on Flagstaff Road will be for local residents and race-related traffic, from Sixth Street to Bison Drive.

Street closures: Pearl Street from 15th to 20th streets will be closed starting at noon.

Both 15th and 20th streets will remain open, but 16th, 17th, 18th and 19th streets will be closed one-half block north and south of Pearl Street. The mall loop will remain open and access to and from the parking garage at 15th and Pearl streets will remain open.

Baseline Road will be closed at Sixth Street beginning at 5 p.m., preventing vehicular access to Flagstaff.

Saturday Aug. 25

Flagstaff Open Space area: After 7 a.m., the public may begin accessing the Flagstaff area on foot using the Viewpoint Trail and by foot or bike using Flagstaff Road. Dogs are prohibited. No bikes will be allowed north of Realization Point on Summit Road. Bike corrals will be available at multiple points on Flagstaff Road.

Tents, canopies or structures will not be allowed on Flagstaff Mountain. Folding chairs and personally held umbrellas are permissible.

After the race, spectators will be allowed to use designated portions of the Flagstaff Trail for egress along with the Viewpoint Trail and Flagstaff Road.

Main Boulder Public Library: The Main Boulder Public Library, 1001 Arapahoe Ave., will be closed Saturday. Branch libraries (Meadows, George Reynolds and Carnegie) will be open regular Saturday hours. Information: boulderlibrary.org.

Chautauqua Park: Chautauqua Park, 900 Baseline Road, will be open, but no public parking will be available anywhere within the Chautauqua area. Chautauqua Dining Hall will be open.

Street closures: Starting at 6 a.m., the closure of Pearl Street will be extended east to Folsom Avenue. The closure will affect all cross streets intersecting Pearl Street from 15th Street to Folsom Avenue.

Seventeenth Street will be closed completely for the entire day from Canyon Boulevard to Spruce Avenue. Vehicles traveling east and west on Walnut Street will be able to cross the intersection of 17th and Walnut streets. All other intersections will be closed.

Starting at 6 a.m., Spruce Street from Broadway to 17th Street will be completely closed for the entire day. Southbound vehicles will be able to cross Spruce Street at 14th Street. Local traffic will be able to cross Spruce Street at 16th Street. All other intersections will be closed.

Starting at 6 a.m., westbound Baseline Road (toward Flagstaff) from Broadway to the west city limits will be closed, except for local traffic at the Broadway and Baseline Road intersection.

Starting at 10 a.m., 20th Street between Baseline Road and Cascade Avenue will be closed and will remain closed for the entire day.

In addition to these full-time street closures, there will be periodic closures of numerous roadways along the USA Pro Cycling race route. These closures typically will take between 15 and 45 minutes, as the caravan of race riders, support vehicles and police escorts traverse the course. Estimated times for periodic road closures are available on the Boulder Stage Interactive Map (usaproboulder.com/map), which also has the most up-to-date event parking and transportation options. A video tour of the interactive map can be seen at vimeo.com/47751383.

The state of Colorado also is announcing information about road closures throughout the region at cotrip.org.

The Regional Transportation District will increase bus service to Boulder to provide more transit options for race spectators, and the Hop will provide free bus service within Boulder on Saturday. Service will be doubled for RTD's BV route and on the BOLT to and from Longmont. RTD route information is available at rtd-denver.com.
For more information on the Boulder stage of the race, visit usaproboulder.com.