Historic Bridges in Iowa
3,036 bridges built before 1951 in Iowa still in service today.
Bridges Built Before 1951
The United States has 3,036 bridges in Iowa 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 |
|---|---|---|---|---|---|
| E BRANCH W. NISH. RIVER | Iowa | Poor | 1920 | 106 | 26 |
| W NISHNABOTNA RIVER | Iowa | Fair | 1920 | 106 | 26 |
| BALLARD CREEK | Iowa | Poor | 1920 | 106 | 60 |
| SKUNK RIVER | Iowa | Poor | 1920 | 106 | 100 |
| RICHLAND CREEK | Iowa | Fair | 1920 | 106 | 33 |
| SUGAR CREEK | Iowa | Fair | 1920 | 106 | 44 |
| OTTER CREEK | Iowa | Poor | 1920 | 106 | 5 |
| BR SUGAR CREEK | Iowa | Poor | 1920 | 106 | 29 |
| BRANCH SUGAR CREEK | Iowa | Poor | 1920 | 106 | 29 |
| W BRANCH 102 RIVER | Iowa | Poor | 1920 | 106 | 15 |
| TRIB DES MOINES RIVER | Iowa | Poor | 1920 | 106 | 45 |
| SPRING CREEK | Iowa | Poor | 1920 | 106 | 26 |
| MILL BRANCH | Iowa | Poor | 1920 | 106 | 82 |
| STREAM | Iowa | Poor | 1920 | 106 | 60 |
| DRAINAGE DITCH 14 | Iowa | Fair | 1920 | 106 | 46 |
| DRAINAGE DITCH 9 | Iowa | Poor | 1920 | 106 | 11 |
| LOCAL CREEK | Iowa | Fair | 1920 | 106 | 120 |
| BEEDS CREEK | Iowa | Fair | 1920 | 106 | 2,468 |
| STREAM | Iowa | Fair | 1920 | 106 | — |
| STREAM | Iowa | Fair | 1920 | 106 | — |
| RED ROCK POOL | Iowa | Fair | 1920 | 106 | 10 |
| METZ CREEK | Iowa | Fair | 1921 | 105 | 2,390 |
| DRAINAGE DITCH | Iowa | Fair | 1921 | 105 | 669 |
| WOLF CREEK | Iowa | Fair | 1921 | 105 | 2,850 |
| STREAM | Iowa | Fair | 1921 | 105 | 2,360 |
| SHELL ROCK RIVER | Iowa | Fair | 1921 | 105 | 2,160 |
| BUCK CREEK | Iowa | Poor | 1921 | 105 | 29 |
| BR LITTLE SIOUX RIVER | Iowa | Poor | 1921 | 105 | 11 |
| BIG CEDAR CR D D 181 | Iowa | Fair | 1921 | 105 | 20 |
| MAPLE RIVER | Iowa | Poor | 1921 | 105 | 11 |
| PITCHER CREEK | Iowa | Poor | 1921 | 105 | 20 |
| CREEK | Iowa | Fair | 1921 | 105 | 51 |
| ELK CREEK | Iowa | Poor | 1921 | 105 | 15 |
| GUNDLACH CR | Iowa | Poor | 1921 | 105 | 29 |
| STREAM | Iowa | Fair | 1921 | 105 | 26 |
| WEST BEAVER CREEK | Iowa | Poor | 1921 | 105 | 300 |
| CREEK | Iowa | Fair | 1921 | 105 | 147 |
| DRAINAGE DITCH | Iowa | Fair | 1921 | 105 | 529 |
| SMALL STREAM | Iowa | Poor | 1921 | 105 | 104 |
| SNIPE CREEK | Iowa | Poor | 1921 | 105 | 51 |
| SMALL STREAM | Iowa | Poor | 1921 | 105 | 26 |
| PRAIRIE CREEK | Iowa | Poor | 1921 | 105 | 51 |
| OTTER CR | Iowa | Poor | 1921 | 105 | 16 |
| BURNETT CREEK | Iowa | Poor | 1921 | 105 | 69 |
| LIZARD CREEK | Iowa | Poor | 1921 | 105 | 21 |
| DD 175 | Iowa | Fair | 1921 | 105 | 5 |
| N LIZARD CREEK | Iowa | Poor | 1921 | 105 | 20 |
| RACCOON RIVER | Iowa | Poor | 1921 | 105 | 45 |
| CREEK | Iowa | Fair | 1921 | 105 | 150 |
| IOWA RIVER | Iowa | Fair | 1922 | 104 | 1,698 |
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.