McKinley Road Bridge Reconstruction

Washington County, IL

Project Cost

$400,000

Completion

2019

Client

Washington County Highway Department

About

The project replaced a single-span bridge with a wider precast 3-sided arch and improved 800 feet of approach roadway. It was designed to AASHTO standards with seismic considerations.

Read More

Work involved approximately 800 feet of approach roadway improvements on enhanced horizontal and vertical alignments. Additional work included the removal of the existing single-span structure on closed concrete abutments, which measured approximately 24 feet back-to-back of abutments and had a clear roadway width of 16 feet 2 inches.

The new structure consists of a 20-foot span precast 3-sided arch measuring 64 feet back-to-back of headwalls, with a clear roadway width of 24 feet between guardrails at a 30° right-ahead skew. The bridge was designed in accordance with AASHTO LRFD HL-93 loading and is located in Seismic Performance Zone 2 with Soil Site Class C. The substructure consists of cast-in-place spread footings founded on bedrock. Topographic and property surveys, permitting, geometric design, legal surveys, easement and right-of-way plats, bridge hydraulics and design, preparation of plans, specifications, and estimates, and construction inspection services were performed by HMG. The project was let on an IDOT state letting, with the low bid for construction at $400,000 in 2019.

Services Provided

  • Topographic and property survey

  • Permitting

  • Geometric design

  • Legal surveys

  • Easement and right-of-way plats

  • Bridge hydraulics and design

  • Preparation of plans, specifications, and estimates

  • Construction inspection