Washington Street Improvements (Phases 1, 2 & 3)

Location: Adams County, Colo.

Client: Adams County

Adams County recently initiated a program that will improve the capacity and safety of over three miles of Washington Street, a major north-south arterial. Under this program, the roadway will be widened to provide a uniform seven lane roadway section of four through lanes, acceleration-deceleration lanes on both sides, and a continuous center turn lane. The improvements also provide curb and gutter, sidewalks, and an enclosed drainage system along the length of the roadway. The proposed improvements require the construction of retaining walls, driveway and sidewalk adjustments, side road intersection reconstruction, new geometrics and lane markings for existing signalized intersections, and the relocation of the existing traffic signals at several locations.

Burns & McDonnell has been engaged by the County to provide professional engineering services for Phases 1 through 3 of the Washington Street improvements. These phases of the project cover approximately 3.3 miles of Washington Street and include numerous side street reconfigurations. Construction for phases 1 and 2 were completed in 2002 and 2006, respectively. Phase 3 of the project is currently in the final design process.

  • Field surveys
  • Geotechnical investigations
  • Signing and marking plans
  • Signal design and capacity analyses
  • Drainage studies
  • Right-of-way plans
  • Right-of-way easement and negotiations
  • Agency coordination and permitting
  • Right-of-way and easement negotiations
  • Phasing and traffic control plans
  • Design and contract documents for all proposed facilities
  • Cost estimates  

Phase 1 (East 78th Avenue to East 83rd Drive) — This phase of the project, which covered 0.9 miles of Washington Street and 0.5 miles of East 78th Avenue, was constructed in 2002 at a cost of $1.3 million. The project included the relocation of existing traffic signals at two locations and the construction of over 1,000 feet of retaining wall.

Phase 2 (State Highway 224 to East 78th Avenue) — This segment, which improved 0.9 miles of Washington Street, included: a 6,000-foot-long stormwater outfall (42-inch to 78-inch diameter pipe) running the length of the project; numerous hydraulic structures including an outfall structure at Clear Creek; utility system relocations and adjustments; the replacement of two irrigation canal crossings with 15-foot-by-4-foot concrete box culverts; relocation of 500 feet of irrigation system distribution ditch; new traffic signals at East 73rd Avenue; the addition of a second left turn lane on Highway 224; environmental permitting; and the modification of the I-270 overpass to accommodate the widened roadway. Construction began in 2005 and was completed in 2006 at a cost of $4.7 million.

Phase 3 (East 58th Avenue to State Highway 224) — This phase of the project, which is currently under design, involves the widening of approximately 1.5 miles of Washington Street to a seven lane facility with improved intersections. The project also includes a new signalized at-grade railroad crossing for the Union Pacific Railroad and the lowering of the existing roadway grade at the I-76 overpass to provide adequate vertical clearance. Capacity analyses are being performed for each of the six signalized intersections to identify the need and extent of the intersection improvements. The project requires numerous permits and extensive coordination with the Colorado Department of Transportation, the Union Pacific Railroad and the Public Utilities Commission. In addition, the project includes approximately 4500 feet of stormwater outfall (up to 30" pipe) and a 3.86 acre-foot stormwater quality pond prior to discharging into Clear Creek.  Estimated construction is approximately $8.2 million.