Bridge conditions in Sangamon County, Illinois
464 inventoried bridges · 28 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
Sangamon County tracks close to typical: 28 of its 464 inventoried bridges (6.0%) are rated poor, against a national rate of about 7%.
- 28 of the 464 bridges in Sangamon County, Illinois, are rated in poor condition (6.0%) in the 2025 National Bridge Inventory, as of .
- 261 bridges (56.2%) are rated good and 175 (37.7%) fair.
- The median Sangamon County bridge was built in 1981.
- The busiest poor-rated bridge is I-55 (NB) over Il 104 / I & M RR (built 1972), carrying about 15,550 vehicles a day.
Good 56.2% · Fair 37.7% · Poor 6.0% of 464 bridges
Bridges rated poor
Every bridge in the county with a poor rating, busiest first. Poor means a major component is rated 4 or lower on FHWA's 0-9 scale; it is a repair flag, not a closure notice.
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-55 (NB) over Il 104 / I & M RR | 1972 | 15,550 | Poor |
| I-55 (SB) over Il 104 / I & M RR | 1972 | 15,550 | Poor |
| I-55 (NB) over Sangamon River | 1963 | 14,600 | Poor |
| I-55 SB over Sangamon River | 1963 | 14,600 | Poor |
| I-55 (NB) over Bl 55 & UP RR | 1962 | 14,600 | Poor |
| Fas 629 over Spring Creek | 1974 | 4,100 | Poor |
| Il 123 over Fancy Creek | 1919 | 2,450 | Poor |
| Ill 54 over Wolf Creek | 1941 | 2,150 | Poor |
| Fas 631-cty Hwy 31 over Wolf Creek | 1985 | 1,700 | Poor |
| County Hwy 37 over S Fork Sangamon Rive | 1980 | 1,600 | Poor |
| Fas 625 over Sugar Creek | 1956 | 1,000 | Poor |
| MS1920 Churchill R over Jacksonville Branch | 1976 | 900 | Poor |
| Tr 197 10.25 S over Spring Creek | 1973 | 400 | Poor |
| County Hwy 28 over Horse Creek | 1957 | 375 | Poor |
| Fas 1622A (ch 28) over Horse Creek | 1957 | 325 | Poor |
| Tr 478 11E over Buckhart Creek | 1958 | 325 | Poor |
| Tr 348 over Horse Creek | 1963 | 225 | Poor |
| Fas 1636 over Richland Creek | 1952 | 200 | Poor |
| Tr 171 over Sangamon River | 1950 | 175 | Poor |
| Cantrell Rd/ Fas 6 over I-72 / US 36 | 1974 | 150 | Poor |
| Tr 446 7.5 E over Wolf Creek | 1900 | 125 | Poor |
| Lanesville Rd/ Ch over I-72 / US 36 | 1975 | 100 | Poor |
| Tr 100 (9.5W) over Spring Creek | 1970 | 100 | Poor |
| Tr 104 (9W) over Prairie Creek | 1971 | 100 | Poor |
| Tr 428 8.25 E over S Fork Sang River | 1954 | 100 | Poor |
| Tr 383 12.5 S over S Fork Lick Creek | 1967 | 75 | Poor |
| Tr 90 (11W) over Spring Creek | 1958 | 50 | Poor |
| Kent Farm Rd/ Tr 5 over I-72 / US 36 | 1974 | 10 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Veterans/il 4 (SB) over Old Ic Rrr.o.w. | 1973 | 31,800 | Good |
| Veterans/il 4 (NB) over Old Ic RR R.o.w. | 1973 | 31,800 | Fair |
| Veterans / Il 4 (S over NS RR & Gateway W RR | 1990 | 31,800 | Good |
| Veterans / Il 4 (N over NS RR & Gateway W RR | 1990 | 31,800 | Fair |
| Veterans / Il 4 (S over I-72 / US 36 | 1973 | 28,400 | Fair |
| Veterans / Il 4 (N over I-72 / US 36 | 1973 | 28,400 | Fair |
| I-55 (NB)/ I-72 (E over Il 29 / So Grand Ave | 1963 | 25,400 | Good |
| I-55 (SB)/ I-72 (W over Il 29 / So Grand Ave | 1963 | 25,400 | Fair |
| I-55 (SB)/ I-72 (W over Lost Bridge Trail Bp | 1995 | 25,400 | Good |
| I-55 (NB)/ I-72 (E over Lost Bridge Trail Bp | 1995 | 25,400 | Good |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
All of Illinois: Illinois bridge conditions by county · every download on the data page.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.