Historic Bridges in Illinois
3,065 bridges built before 1951 in Illinois still in service today.
Bridges Built Before 1951
The United States has 3,065 bridges in Illinois built before 1951 that remain in active service. These structures are 75+ years old — many predate modern engineering codes and were not designed for today's traffic volumes and vehicle weights. The average design life of a bridge is 50 years, making these aging structures a significant infrastructure concern.
| Bridge | State | Condition | Year Built | Age (Years) | ADT |
|---|---|---|---|---|---|
| CAL SAG CHANNEL | Illinois | Fair | 1934 | 92 | 20,500 |
| SILVER CREEK | Illinois | Fair | 1934 | 92 | 27,400 |
| RR - EJ&E | Illinois | Fair | 1934 | 92 | 12,400 |
| S BR CHICAGO RIVER | Illinois | Poor | 1934 | 92 | 6,050 |
| DRY FORK | Illinois | Fair | 1934 | 92 | 1,550 |
| DES PLAINES RIVER | Illinois | Fair | 1934 | 92 | 32,400 |
| NORFOLK SOUTHERN RR | Illinois | Fair | 1934 | 92 | 4,200 |
| SANDY RUN | Illinois | Fair | 1934 | 92 | 375 |
| OVERFLOW TO BIGCREEK | Illinois | Good | 1934 | 92 | 625 |
| HICKORY CREEK | Illinois | Fair | 1934 | 92 | 600 |
| HURRICANE CREEK | Illinois | Fair | 1934 | 92 | 550 |
| RAMSEY CREEK | Illinois | Good | 1934 | 92 | 725 |
| TRIB HURRICANE CREEK | Illinois | Good | 1934 | 92 | 600 |
| DRAIN DITCH | Illinois | Fair | 1934 | 92 | 1,100 |
| STREAM | Illinois | Good | 1934 | 92 | 125 |
| BNSF RR | Illinois | Fair | 1934 | 92 | 3,300 |
| OTTER CR | Illinois | Fair | 1934 | 92 | 550 |
| DUCK CR | Illinois | Poor | 1934 | 92 | 2,100 |
| BR OF SWEGLE CR | Illinois | Fair | 1934 | 92 | 400 |
| WOODS RUN | Illinois | Fair | 1934 | 92 | 1,450 |
| HENDERSON OVERFLOW | Illinois | Fair | 1934 | 92 | 275 |
| STREAM | Illinois | Fair | 1934 | 92 | 2,050 |
| PENNY SLOUGH | Illinois | Good | 1934 | 92 | 2,200 |
| PRAIRIE CR | Illinois | Poor | 1934 | 92 | 25 |
| SIX MILE CREEK | Illinois | Fair | 1934 | 92 | 2,700 |
| CN RR | Illinois | Fair | 1934 | 92 | 2,850 |
| N FORK PLUM RIVER | Illinois | Fair | 1934 | 92 | 50 |
| ABANDONED RR | Illinois | Good | 1934 | 92 | 1,200 |
| BIG ROCK CREEK | Illinois | Fair | 1934 | 92 | 2,200 |
| DRAINAGE DITCH | Illinois | Fair | 1934 | 92 | 1,300 |
| WALNUT CREEK | Illinois | Good | 1934 | 92 | 300 |
| VERMILION RIVER | Illinois | Fair | 1934 | 92 | 1,650 |
| BUCK CREEK | Illinois | Fair | 1934 | 92 | 450 |
| PERSON CREEK | Illinois | Fair | 1934 | 92 | 1,300 |
| BUCK CREEK | Illinois | Good | 1934 | 92 | 50 |
| OTTER CREEK | Illinois | Fair | 1934 | 92 | 275 |
| BRANCH LITTLE BONPAS | Illinois | Fair | 1934 | 92 | 850 |
| Trib to Raccoon Cree | Illinois | Poor | 1934 | 92 | 35 |
| LAKE FORK OVERFLOW | Illinois | Fair | 1934 | 92 | 800 |
| SALT CK OVERFLOW | Illinois | Fair | 1934 | 92 | 900 |
| STREAM | Illinois | Fair | 1934 | 92 | 900 |
| BRANCH MONEY CREEK | Illinois | Good | 1934 | 92 | 900 |
| COOP BRANCH E | Illinois | Fair | 1934 | 92 | 1,800 |
| TRIB TO SILVER CREEK | Illinois | Good | 1934 | 92 | 5,750 |
| ILL RIVER CROMWELL DR | Illinois | Poor | 1934 | 92 | 2,200 |
| WOODS CREEK | Illinois | Fair | 1934 | 92 | 2,300 |
| MARTIN CREEK | Illinois | Fair | 1934 | 92 | 950 |
| N FK BROWER CREEK | Illinois | Fair | 1934 | 92 | 775 |
| MIDDLE FK MCKEE CR | Illinois | Fair | 1934 | 92 | 725 |
| HILL CREEK | Illinois | Fair | 1934 | 92 | 50 |
About Historic Bridge Data
Bridges built before 1951 are classified as historic in this database. Many were designed to 1940s standards with lower load limits and narrower lanes. While FHWA requires regular inspections of all bridges regardless of age, older structures often require more frequent monitoring and rehabilitation investment.