# Illinois BidBuy #27-557THA-ENGCO-B-54180

Amendment for I-490 Railroad Bridge Construction Project

**Posted:** September 24, 2026
**Respond By:** October 16, 2026
**Identifier:** 27-557THA-ENGCO-B-54180
**NAICS:** 237310, 237990

This amendment concerns the I-490 Railroad Bridge Construction project managed by the Illinois Toll Highway Authority (THA), Engineering - Construction department.
- Buyer: Illinois Toll Highway Authority (THA), Engineering - Construction
- Project: I-490 Railroad Bridge Construction (Purchase Order 22-557THA-ENGCO-P-39678)
- Amendment adds $199,116.84 to the contract value
- Products/Services:
  - Field Office Type C Supplement (1 unit)
  - General construction services for the I-490 Railroad Bridge
- No specific OEMs or manufacturers are named in this notice
- Notable requirements:
  - Provision of a field office supplement
  - Compliance with general construction service standards (NIGP code 912-00)
- Procurement is open market and available via the Illinois BidBuy portal

### Description

This solicitation is an amendment/change order for the I-490 Railroad Bridge Construction project managed by the Toll Highway Authority in Illinois. The work involves construction services related to the I-490 Railroad Bridge, associated with Purchase Order 22-557THA-ENGCO-P-39678. The original contract amount was $21,133,068.98, with a change order amount of $199,116.84. The procurement is conducted through an open market method and bids are due by October 16, 2026.

[View original listing](https://www.bidbuy.illinois.gov/bso/external/bidDetail.sda?docId=27-557THA-ENGCO-B-54180&external=true&parentUrl=close)