(Silver Award)  I-25, Lincoln Avenue to County Line Road, Douglas County, Colo.

Contractor:  Interstate Highway Construction, Inc.           

Owner:   Colorado DOT

Engineer:  Colorado DOT Region 1 – Lone Tree Residency

 

Interstate 25 from Lincoln Avenue to County Line Road is the last section of I-25 between Denver and Castle Rock to be widened to four through lanes in each direction. The roadway carries over 180,000 vehicles per day, including 13,000 commercial trucks.

This very complex $27 million project had 307 pay items of work including 175,000 square yards of concrete pavement (25 lane miles). Work on the 441 working day project began in August of 2014, and the grand opening occurred on time in March of 2016.

The project might never have happened without the financial partnership of the Federal Highway Administration, Colorado DOT, and Douglas County, the City of Lone Tree, the Community of Meridian, the Park Meadows Metro District, and a huge contribution from DRCOG (Denver Regional Council of Governments). 

The construction was managed entirely by Colorado DOT staff, which worked with IHC and subcontractors to keep their schedule flowing, and inspected at all times.

Traffic safety and unhindered flow through the project was a prime consideration.  The DOT did not allow any reduction in travel lanes between 5:30 a.m. and 8:30 p.m. Nighttime lane closures and nighttime full Interstate closures were allowed.

Construction was scheduled around schedules of the Denver Broncos’ home games for two seasons, and in advance of the Christmas shopping rush, the northbound I-25 portion of the project was open to four lanes before Black Friday. During construction, traffic conditions, including speed, accident rates and travel times through the corridor, were no worse and, in some cases, better than pre-construction conditions.

Another complex aspect of the project was dealing with utility issues. The contractor had to work around fiber optic lines (including one transcontinental line that could not be moved), water lines, power lines, irrigation, and others. 

The project can boast of many innovations and successful changes to the initial scope of the construction. The existing asphalt and concrete pavements were recycled and reused on the project, saving thousands of trucking miles and the cost of importing materials. Some concrete pavement was recycled and used as aggregate in temporary concrete detour pavement, and then recycled again in permanent pavement.  

Peak flow speeds before construction were 16 mph, but now are 48 mph, and according to the FHWA’s road user criteria, this contributes about $58,000 per day in road user cost savings. Based on this user cost savings, the project will pay for itself in approximately two years. Equally important, motorists in south metro Denver have a highway they can be proud of for 30 years or more.

 

(Gold Award) Grand Parkway Project, Houston, Texas

Contractor:  Zachry Construction Corp. | Odebrecht Construction, Inc.

Owner:   Texas DOT

Engineers:  Parsons Transportation Group | The Transtec Group, Inc.      

SH 99 is a proposed 180-mile circumferential highway traversing seven counties in the Greater Houston Area. The highway is divided into 11 segments.

Zachry was the managing joint-venture partner of Zachry-Odebrecht Parkway Builders, the Developer and Lead Contractor, responsible for the development of SH 99 Grand Parkway Segments F1, F2, and G (the Project).

Zachry-Odebrecht Parkway Builders worked with the Texas Department of Transportation (TxDOT) to design, construct, and maintain 37.8 miles of divided two-lane controlled access toll road that intersects 19 major roads and includes 4 major interchanges.

The project included more than 120 bridges; one river crossing; 1.8 million square yards of concrete paving; frontage roads and associated drainage; right of way (ROW) acquisition management of approximately 480 parcels (2,127 acres); and the design, coordination and relocation of 177 utilities.

Zachry-Odebrecht Parkway Builders challenged the team to develop and design a project approach that was innovative and tailored to meet the DOT’s needs.

The result was a value-added concept that brought technical solutions and cost reduction through the implementation of alternative technical concepts.

The aggressive schedule was one of the fastest to deliver a project of this magnitude. The project team accelerated construction through very careful planning and sequencing of activities, as well as, the use of an on-site precast yard to prefabricate beams and deck panels.

The project was divided into three construction segments with support departments, including paving, a casting yard, project administration, public information, ROW acquisition, environmental team, and utility team.

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* ACPA Member.