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Infrastructure Road ConstructionIL-47Crystal LakeMcHenry County

$57 Million in Road Work Planned Across Western McHenry County

Four projects will affect drivers across the area this construction season, with more than $57 million in work underway or scheduled.

· 1 min read

Orange barrels are coming. Four projects totaling $57 million will reshape driving across western McHenry County this season. Here is what to expect.

Where the work is

Road construction projects across western McHenry County, spring–fall 2026

Root Road Marengo Rd / Rush Creek IL-47 / IL-176 Route 23
Source: IDOT FY 2026–2031 Highway Improvement Program · McHenry County Division of Transportation

Root Road between Kishwaukee Valley Road and Tomlin Road in Marengo Township is getting a new surface. About a mile of fresh asphalt, 1.5 inches thick. Seven contractors submitted bids on March 4, and per the contract terms, equipment cannot roll before May 4. Funding comes from Motor Fuel Tax and township money.

Farther north on Marengo Road, IDOT has two projects confirmed in its two-year construction look-ahead. That means these are real, not placeholders in the longer-range program. The first is a pavement overlay from Airport Road to IL-23. The second is a bridge replacement at Rush Creek, about half a mile south. Together the two jobs total roughly $3.3 million. No public start dates yet for either one.

The biggest project is already underway. If you commute east on IL-47 to Crystal Lake, you already know. IDOT is tearing up and rebuilding the IL-47 and IL-176 intersection in Crystal Lake and Lakewood, realigning Pleasant Valley Road in the process. Plote Construction won the job at $50.4 million, nearly 90 percent of the area's total construction spending this season. The contract calls for completion by October 31, with daily lane closures until then.

One more to file away for next year. McHenry County plans to replace the Marengo Road bridge over Union Creek in Coral Township, a $4.5 million project that will widen the span for farm equipment and bicyclists, raise the roadway profile, and rebuild the approaches. When construction begins, the bridge closes for roughly nine months. The signed detour will route traffic along US 20 and Harmony Road.

Sources (5)
  1. McHenry County contract 26-12000-01-GM proposal document, bid letting March 4, 2026.
  2. IDOT FY 2026-2031 Multi-Year Program, two-year construction look-ahead workbook.
  3. IDOT accepted bid tab, letting March 8, 2024. Plote Construction Inc., $50,387,361.97.
  4. IDOT contract detail, completion date October 31, 2026 plus 10 working days.
  5. McHenry County Division of Transportation, Marengo Road Bridge project page.