WestConnect study recommends improvements for safety, congestion

Study considers 30 miles in Jeffco, Boulder

Posted 7/10/18

A high number of motorist crashes and recurring traffic congestion are just two of the reasons the Colorado Department of Transportation (CDOT) says a study needed to be done on an approximate …

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WestConnect study recommends improvements for safety, congestion

Study considers 30 miles in Jeffco, Boulder

Posted

A high number of motorist crashes and recurring traffic congestion are just two of the reasons the Colorado Department of Transportation (CDOT) says a study needed to be done on an approximate 30-mile stretch of roadway in Jefferson County.

CDOT and the WestConnect Coalition (including county and municipal elected officials and experts) recently completed a Planning and Environmental Linkages (PEL) study between roughly Littleton and Boulder. The study included C-470 from Kipling Street to the I-70/U.S. 6 division, U.S. 6 from C-470 to CO 58/CO 93 in Golden and CO 93 from Golden to Marshall Road in Boulder County.

The study took 18 months to evaluated ways to reduce congestion, improve operational performance and safety and address future transportation needs for the corridor.

Now that the initial PEL study is complete, the next steps will be the National Environmental Policy Act (NEPA)/30 percent design phase — an environmental assessment and preliminary design. Funding for this has been provided by Colorado’s Transportation Commission for the C-470 Segment and is expected to begin this fall.

Two potential transportation infrastructure statewide ballot initiatives for November 2018 could give funding for a couple of projects recommended in the WestConnect study.

These are: full construction funding for the U.S. 285 and Morrison Road interchange, included in the C-470 Segment of the PEL study; and the U.S. 6 and Heritage Road interchange improvements, included in the Golden Section of the PEL study.

C-470 Segment: C-470 from Kipling Street to the I-70/U.S. 6 division

There are a couple of different highway infrastructure recommendations for this segment of the road. One alternative consists of having three general purpose lanes and auxiliary lanes in each direction. The second alternative includes having one or two managed lanes plus two general purpose lanes and auxiliary lanes in each direction.

Interchange modifications for this section are recommended at Ken Caryl Avenue and Quincy Avenue.

Currently, the off ramps from C-470 to US 285 are tight loops. These are recommended to be reconstructed with directional ramps. Access to Bear Creek Lake Park would be moved to the realigned ramp from southbound US 285 to westbound C-470.

Two options address weaving traffic along I-70 between C-470 and US 6 to the east. One option is a collector/distributor road and the other is a braided ramp with westbound I-70 to eastbound US 6 traffic crossing under the ramp traffic from C-470 to eastbound I-70.

Golden Segment: U.S. 6 from C-470 to CO 58/CO 93 in Golden

There are a number of infrastructure recommendations in the corridor that includes Golden. These include improvements outlined in The Golden Plan, which is meant to accommodate regional traffic needs on U.S. 6 and CO 93.

U.S. 6: On U.S. 6, The Golden Plan includes grade separation of the at-grade intersections at Heritage Road and CO 58.

An additional eastbound and westbound lane through the Johnson Road/U.S. 6/C-470 intersection is recommended.

From Johnson Road to 19th Street, the median of U.S. 6 would be improved with a four-lane cross section consistent with a 55 mph speed limit. West of 19th Street, the median would be widened and improved consistent with a 45 mph speed limit.

CO 93: Intersection improvements recommended are at 58th Avenue and 64th Parkway. Grade-separated turning movements are recommended with the southbound CO 93 left-turning traffic separated from the northbound CO 93 traffic.

From CO 58 to Golden’s northern city limit, near the North Table Mountain Park West Trailhead, there would be four travel lanes with a 45 mph speed on CO 93. A four-lane section on CO 93 is also recommended through 64th Parkway.

CO 93 would be realigned to the west from south of Iowa Street to north of Golden Gate Canyon Road. Short-term at-grade intersections and long-term grade separations will eliminate all traffic signals.

CO 93 Segment: CO 93 from Golden to Marshall Road in Boulder County

Highway infrastructure recommendations are presented with two alternatives for this section of the corridor. The first consists of four lanes between Golden and Boulder with signalized intersection improvements. The second includes four lanes from Golden to CO 72 and two lanes with extended passing lanes and signalized intersection improvements with an interchange at CO 72.

Two alternatives are recommendations for the 82nd Avenue intersection — at-grade signalized intersection improvements and a signalized, channelized T intersection.

At the CO 72 intersection, at-grade intersection improvements are recommended in the short term, and a grade-separated interchange with CO 72 crossing over CO 93 in the long term.

The study also presents recommendations for the Westgate Road intersection, the CO 128 intersection and the CO 170 intersection.

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