Boulder County-area cone zones for Aug. 15-21, 2022


• 30th Street and Colorado Avenue Underpass Project: Left turns will be restricted westbound, eastbound and southbound for underpass construction. Sidewalk detours where noted (southeast quadrant sidewalks closed). Use temporary crossings at 30th/Euclid Avenue and Colorado west of the intersection. Cyclists merge with traffic. Northbound bus stop on 30th (BOUND) closed; board at next stop. Anticipated end date is Dec. 31.

• North Broadway: Pavement will be improved to concrete and buffered bike lanes installed. Vehicle travel lanes will shift to existing northbound lane and bike lane. The west side sidewalk will be closed — the east side sidewalk can be used. The bicycle and pedestrian reroute will be to the west along Ninth Street and multiuse path. Activity time is from 7 a.m. to 5 p.m. Anticipated end date is Dec. 30.

• Rosewood Avenue and 13th Street: Eastbound Rosewood at Broadway will be closed for intersection reconstruction. Message board and construction flaggers will assist with the detour on 14th Street to Yarmouth Avenue to access Broadway. Neighborhood traffic can use 14th via Rosewood to access 13th and local businesses. Broadway Apartments access to Violet Avenue on 13th at Broadway will be closed — residents may use 13th at Violet to access the building. Construction will be 24 hours a day every day through Aug. 29.

• Baseline Road: There will be a single lane closure on Baseline from 17th Street to 14th Street for a city fiber backbone project. Flaggers will be used to assist traffic. Activity time is 9 a.m. to 4 p.m. Anticipated end date is Aug. 31.

• Arapahoe Road and Commerce/Eisenhower: The intersection is being completely reconstructed for a signal pole replacement. Work is anticipated to end Sept. 15.

• Hill Hotel: Westbound Pleasant is open for local traffic from Broadway to the alley. The eastbound lane is closed. This is for demolition of old buildings and waterline and new sewer work. Activity time is 7 a.m. to 5 p.m. Anticipated end time is Jan. 31, 2024.

Boulder County

• Sugarloaf Road: Due to an unsafe and confined work zone, Sugarloaf Road will need to be closed between Colo. 119 and Betasso Road during the following times for the next four weeks: 9:30 a.m. to noon and 1 to 3:30 p.m. Monday through Friday. Sugarloaf will remain open in a single-lane configuration through the work zone during all other hours. Boulder County is working on the last 2013 flood recovery-related project on Sugarloaf Road. The project involves the construction of five retaining walls, drainage improvements and reconstruction of approximately 2,000 feet of roadway just up from Colo. 119 and will include a 4-foot shoulder in the uphill lane. In addition, Colo. 119/Boulder Canyon Drive will be reduced to one lane from 8 a.m. to 4:30 p.m. Monday through Friday. The project is anticipated to last into October, weather permitting.

• Annual paving operations: Work will take place in the following order: 79th Street between Colo. 52 and Niwot Road; Monarch Road between 79th Street and the Diagonal Highway (Colo. 119); 73rd Street between the Diagonal and Niwot; Niwot between the Diagonal and 73rd Street; 63rd Street between Jay Road and the City of Boulder limits; Second Avenue in Niwot; and Valmont Road between Boulder Creek and 61st Street. Construction on each segment will take approximately one week, with the exception of Second Avenue in Niwot, which should take two to three days. Paving operations will include milling of old road surface and adding a layer of new asphalt. Motorists and cyclists can expect single-lane closures in work zones. Flaggers will be used to guide travelers safely around construction operations; expect delays and use caution when passing through the zone. Work will take place from 6:30 a.m. to 4:30 p.m. Monday through Thursday, and is expected to last through August, weather permitting.

• Olde Stage Road Project. Milling of the old surface is planned to start Monday. Work will start from the southern end at Lee Hill Drive and proceed north, then crews will flip around at Leftand Canyon Drive and work on milling the southbound lane. This work is expected to take all week. Expect long work zones, which means delays could range up to 15 minutes. Alternate routes are advised. Cyclists may want to avoid Olde Stage for the next four to six weeks as the roadway will be in a rough, milled condition until paving is completed. After milling, crews will start repairing the subsurface in order to make the new roadway stronger. At the same time, crews will be working on widening the southern portion of the road (Lee Hill to the top of the first hill) to create the new 4-foot shoulder in the northbound climbing lane. Once this work is done, paving will begin. Paving is expected to take two to three-weeks to complete. Crews are expecting to have the roadway completely repaved by early October, weather permitting. Additional shouldering, striping and final cleanup work is expected to last until the end of October.


• Washington Avenue Reconstruction and Drainage Improvement Project: The project will install inlets and improve localized drainage issues on Washington Avenue at Birch Court.  ADA ramps and sidewalk connections will be improved. Once drainage and concrete improvements are made, the contractor will perform full-depth milling, and the road will receive new asphalt from South Boulder Road to the Treatment Plant driveway. After concrete and storm work is completed the contractor will mill and pave Washington from South Boulder Road to the Water Treatment Plant’s driveway. Work is expected to continue through the middle of September.


• LaMont Does parking lot: The LaMont Does Park parking lot is closed along South Boulder Road. The parking lot on Saratoga Drive will remain open and accessible for overflow parking. The restrooms at LaMont Does parking lot are also closed. Temporary restrooms are available in the Saratoga Drive parking lot.

• South Boulder Road: South Boulder is in a two-way/head-to-head configuration on the north side of the road. Eastbound and westbound traffic will continue to use this configuration while crews install the storm sewer pipe. Westbound South Boulder Road at Saratoga and Merlin drives will have one through travel lane and one left turn only travel lane. Prepare for delays in the area.

• RTD bus stop: RTD bus riders who use the stop on South Boulder Road at Robin Hood Street can catch the bus at the next stop on Sir Galahad Drive at South Boulder Road. Traffic must stay on designated paths.

• South Boulder Road sidewalk: The sidewalk on the south side of South Boulder Road from Saratoga Drive to 120th Street is closed. Pedestrians and cyclists should follow sidewalk detour signage and use the sidewalk on the north side of South Boulder Road in this area.


• Erie Airpark: The first phase, and largest impacts for road construction will continue through Aug. 31. Road surfaces will be removed to apply a subgrade treatment before repaving the streets. Every attempt to meet the current driveway access will be evaluated on a case-by-case basis. Some of the driveway accesses will need to be adjusted due to the increased height of the road, an inch or two in most cases. Driveway access tie-ins, site cleanup and final checklist items will continue through September. General work hours are from 7 a.m. to dusk weekdays, with occasional extended hours. Saturday work hours are 7 a.m. to 4 p.m. No work is expected to take place on Sundays and holidays.


• Longs Peak Avenue. The road will be temporarily widened between Sunset Street and the Sunset Pool parking lot, and the two lanes of traffic will be shifted to the south so that construction equipment can be parked on the north side of Longs Peak Avenue. There will also be initial work on the waterline that runs underneath Sunset Circle. Residents and commuters should plan for the following construction activities from 7 a.m. to 7 p.m. weekdays through August.

• Chipseal roadwork: Work is being done on Third Avenue from Martin Street to Colo. 119; Addie Rose Lane; Alpine Lane; Autumn Court; Carbide Court; Drift Place; Eldora Place; Independence Drive; Kinnikinnick Court; North Shore Drive; Snowbank Court; Trevor Circle; and Trevor Court. Affected residences and businesses will be notified in advance. Work is scheduled to last into September.

Weld County

• County Road 4.5: Weld County Road 4.5 is closed from WCR 23 to WCR 23.75 until Sept. 2 for a bridge re-deck and guard rail replacement.

• Interstate 25/WCR 34 bridge overpass. Work on top of and under the the new bridge on I-25 will continue throughout the project duration. Vehicles may use on/off ramps only and cannot cross over. The Berthoud to Johnstown Project team will hold a virtual public meeting at 6 p.m. Monday to discuss the details of an upcoming closure of Colo. 60 and provide an overall project update. Go to for more information.

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