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Bridge conditions in Sangamon County, Illinois

464 inventoried bridges · 28 rated poor · 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

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 August 20, 2026.
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.

Every bridge in Sangamon County → - all 464, busiest first, each with its own condition record.

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.