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 |
|---|---|---|---|---|---|
| Two Mile Slough | Illinois | Poor | 1937 | 89 | 175 |
| LOST CREEK | Illinois | Fair | 1937 | 89 | 4,100 |
| Mid Trib Flat Branch | Illinois | Fair | 1937 | 89 | 3,250 |
| CASSEL CREEK | Illinois | Fair | 1937 | 89 | 2,400 |
| S FORK INDIAN CREEK | Illinois | Fair | 1937 | 89 | 1,150 |
| KASKASKIA RIVER | Illinois | Fair | 1937 | 89 | 600 |
| DITCH | Illinois | Poor | 1937 | 89 | 2,400 |
| Poplar Creek | Illinois | Fair | 1937 | 89 | 3,400 |
| MAIN BR CHICAGO RIV | Illinois | Poor | 1937 | 89 | 102,000 |
| VAR CITY STS & RR | Illinois | Fair | 1937 | 89 | 11,200 |
| 47TH ST | Illinois | Good | 1937 | 89 | 108,400 |
| SUGAR CREEK | Illinois | Poor | 1937 | 89 | 20 |
| N BR HUDSON CREEK | Illinois | Fair | 1937 | 89 | 475 |
| DRAINAGE DITCH | Illinois | Fair | 1937 | 89 | 4,500 |
| DRAINAGE DITCH | Illinois | Poor | 1937 | 89 | 4,500 |
| SALT CREEK | Illinois | Fair | 1937 | 89 | 1,100 |
| EMBARRAS RIVER | Illinois | Fair | 1937 | 89 | 2,400 |
| SALT CREEK | Illinois | Fair | 1937 | 89 | 61,200 |
| EWING CK | Illinois | Fair | 1937 | 89 | 1,600 |
| SUGAR CREEK | Illinois | Fair | 1937 | 89 | 2,200 |
| TRIB FOUNTAIN CR | Illinois | Fair | 1937 | 89 | 125 |
| APPLE RIVER | Illinois | Poor | 1937 | 89 | 575 |
| LITTLE RUSH CREEK | Illinois | Fair | 1937 | 89 | 350 |
| CEDAR CREEK | Illinois | Good | 1937 | 89 | 550 |
| FLINT CREEK TRIB | Illinois | Poor | 1937 | 89 | 24,300 |
| DEERPATH RD | Illinois | Fair | 1937 | 89 | 41,000 |
| MILL RACE | Illinois | Good | 1937 | 89 | 3,450 |
| GREEN RIVER | Illinois | Fair | 1937 | 89 | 1,950 |
| VERMILION RIVER | Illinois | Fair | 1937 | 89 | 1,800 |
| DRAIN DT | Illinois | Fair | 1937 | 89 | 525 |
| MOLE CREEK | Illinois | Fair | 1937 | 89 | 850 |
| PRAIRIE CREEK DITCH | Illinois | Fair | 1937 | 89 | 2,300 |
| PRAIRIE CREEK | Illinois | Fair | 1937 | 89 | 2,300 |
| SUGAR CREEK | Illinois | Fair | 1937 | 89 | 2,200 |
| CAMP CREEK | Illinois | Poor | 1937 | 89 | 200 |
| N BRANCH CROOKED CR | Illinois | Good | 1937 | 89 | 325 |
| S BRANCH CROOKED CR | Illinois | Good | 1937 | 89 | 325 |
| SANGAMON RIVER | Illinois | Fair | 1937 | 89 | 775 |
| ADAMS CREEK | Illinois | Fair | 1937 | 89 | 1,750 |
| GILLESPIE LAKE CREEK | Illinois | Fair | 1937 | 89 | 2,350 |
| CAHOKIA CREEK | Illinois | Fair | 1937 | 89 | 7,950 |
| Cahokia Creek | Illinois | Fair | 1937 | 89 | 6,550 |
| Mooney Creek | Illinois | Fair | 1937 | 89 | 6,550 |
| SOO RR. | Illinois | Fair | 1937 | 89 | 3,400 |
| DICKISON RUN CREEK | Illinois | Poor | 1937 | 89 | 14,400 |
| LAKE FORK DRAIN DIT | Illinois | Fair | 1937 | 89 | 800 |
| LAKE FORK DRAIN DIT | Illinois | Fair | 1937 | 89 | 25 |
| FANCY CREEK | Illinois | Fair | 1937 | 89 | 4,450 |
| STREAM | Illinois | Poor | 1937 | 89 | 10,050 |
| ROBINSON CREEK | Illinois | Fair | 1937 | 89 | 225 |
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.