Dillon Road/W. 144th Ave. Project

Dillon Road - W 144th

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Dillon Map for Website.png
Phase 1 - US 287 to Sheridan Blvd.

30% level design plans were received in February, and final construction plans are anticipated by August 2018. The roadway section includes 11.5-foot travel lanes, 6-foot bike lanes, landscaping on the south side from Aspen St. to Sheridan Blvd. and a multi-use trail along the south side. A frontage road is proposed on the north side of Dillon Rd. from Aspen St. to Benton St. No streetlights are planned west of Aspen St., and undergrounding the overhead power lines is proposed west of Sheridan Blvd. Boulder County and the City of Lafayette support the proposed roadway and trail alignment. Preparation of property acquisition documents is underway for the additional right-of-way (ROW) needed to widen the road. The construction plans to pipe the FRICO Community Ditch are about 80% complete. Phase 1 utility and roadway work are tentatively scheduled to commence in fall 2018 and spring 2019 respectively.

Phase 2 - Sheridan Blvd. to Zuni Street
30% level design plans were received in early May, and final construction plans are anticipated by November 2018. Eastbound and westbound dual left turns will be added at Sheridan Blvd., and the pavement will be restriped to add northbound and southbound left turn lanes. The roadway section includes 11-foot travel lanes, 5-foot bike lanes, 8-foot sidewalks and landscaping on both sides, median segments (some landscaped), and a new southbound left turn lane at Zuni St. No new signals are proposed as they are not warranted according to traffic projections. Staff is meeting with adjacent property owners on the north side between Lowell Blvd. and Zuni St. to discuss the proposed roadway layout and anticipated ROW acquisition process. Phase 2 utility and roadway work are tentatively scheduled to commence in spring and summer 2019 respectively.


Survey work and topographical mapping is complete.

A contract amendment with Muller was presented to Council and approved on August 8, 2017, for the professional services needed to complete the roadway widening design of the additional segments added with debt financing. The construction schedule will be determined based on the timing of the ROW acquisition from adjacent property owners, permit approval by external agencies, utility relocation, and any environmental or wildlife permitting restrictions.

In late June 2017, staff met with Boulder County to discuss the conceptual roadway layout from South 120th Street to Sheridan Boulevard, alignment of the multi-use trail and the necessary coordination as the project moves forward.

In April 2017, residents adjacent to Dillon Road between S. 120th St. and Sheridan Blvd. were invited to attend a neighborhood open house to view and discuss this preferred alternative:
Alternative 4

Council discussed and approved debt financing the project along with other CIP projects. The bond amount will provide funding to widen all segments of Dillon Road/West 144th Avenue from US 287 to Zuni Street.  

The roadway will be designed in general conformance with the Dillon Road/West 144th Avenue master plan. The project will follow a fast-track delivery method to allow construction documents to be released in phases so construction can start as early as possible. Under this strategy, utility construction would tentatively commence in spring 2018 and roadway work in fall 2018. The construction schedule will be determined based on the timing of the ROW acquisition from adjacent property owners, permit approval by external agencies, utility relocation, and any environmental or wildlife permitting restrictions. Construction is anticipated to be substantially complete in fall 2020. 

The current phase of the project will complete the ultimate widening of the west end of the Dillon Road/West 144th Avenue corridor to four continuous through lanes from just west of South 120th Street to Sheridan Boulevard. It will also add bike and pedestrian path/lane improvements from Sheridan Blvd. west to US 287. These include striped bike lanes, a detached or barrier-separated, multi-use trail along the south side of Dillon Road from Sheridan Blvd to the Rock Creek bridge on Road K (the West Dillon Road/Reid-Wright access); “Share the Road” signage in both directions across the Rock Creek bridge, connecting to the Rock Creek Trail; and a detached or barrier-separated multi-use trail from the Rock Creek Trail to the northeast corner of US 287.
Preferred Alternative for Bike and Pedestrian Improvements

In March 2017, Council directed staff to pursue the alternative that maximized safety and traffic progression.  Council requested that staff work with Boulder County for cost-sharing of the project.
 
On March 9, 2016, Broomfield staff had an open house with residents living adjacent to Dillon Road between S. 120th St. and Sheridan Blvd. to gather comments.

Click HERE to view public comments from this meeting.

On January 20, 2016, Broomfield staff met with representatives from Boulder County Transportation and Open Space to discuss:
  • conceptual layout of Dillon Road from South 120th Street to Sheridan Boulevard;
  • Bike lane and shared-use path alternatives from the Dillon Road bicycle/pedestrian access feasibility study; and
  • Approximations of right-of-way (ROW) needed from Boulder County to complete the proposed roadway and bicycle/pedestrian improvements.

1 - PROJECT VICINITY MAP
Dillon 287 to 120th

Dillon Sheridan to Zuni

Dillon Road Expansion Project Rendering - East from S. 120th St. to Sheridan Blvd.



Conceptual Drawing
(Renderings and design by Mueller Engineering)


Background Information


Dillon Road/West 144th Avenue is a regional roadway with connectivity to I-25, US 287, and arterial street connections to Lafayette and Louisville. The roadway between the Northwest Parkway (NWP) and Zuni Street is in the City and County of Broomfield. 

Traffic Analysis Report established that traffic congestion is heaviest westbound during the morning peak hour, and eastbound during the afternoon peak. 
  • During the morning peak, the less congested eastbound trip took approximately 7 minutes at an average speed of 30 mph. While the very congested westbound trip took 17 minutes at an average speed of 12 mph.
  • During the afternoon peak, the less congested westbound trip took approximately 6 minutes at an average speed of 35 mph.
  • There was a rolling "stop and go" westbound vehicle queue extending east from Aspen Street nearly to Lowell Boulevard.
  • At times traffic would sit at a green traffic signal with no room to move forward. There was a long queue (20 plus vehicles) of northbound traffic on Aspen Street waiting to turn left onto 144th Avenue during each cycle.
Click HERE for Traffic Questions & Answers.

Click HERE for Dillon Rd./144th Ave. Traffic Forecast and Adjacent Roadway Impact Analysis Report.

The Broomfield City Council appropriated project funding in the 2016 budget to complete the ultimate widening of the west end of the Dillon Road/West 144th Avenue corridor to four continuous through lanes from just west of South 120th Street to Sheridan Boulevard. The project will include the recommended bike and pedestrian path/lane improvements. 


Comments or questions? Please email Noreen at ngardner@broomfield.org.