Mason County Bridge Report Card

Mason County scores 93 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

A93 / 100

Local infrastructure snapshot

Mason County, Illinois

Mason County has 86 bridges in the National Bridge Inventory, with 3 rated poor and 0 rated scour-critical. Its poor-condition share of 3.5% is at or below the 9.5% statewide average. Poor-condition bridges carry about 100 daily vehicle crossings.

86Total Bridges

3Poor (3.5%)

52Fair (60.5%)

0Scour-Critical

Quote-Ready Local Facts

3.5%of county bridges are in poor condition, compared with 9.5% statewide and 6.7% nationally.

100daily vehicle crossings are on poor-condition bridges in the county.

0bridges are rated scour-critical, or 0.0% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Mason County a Bridge Condition Exposure Score of 93/100 (A). The county has 86 bridges in the National Bridge Inventory, including 3 in poor condition and 0 rated scour-critical. Poor-condition bridges carry about 100 daily vehicle crossings. Poor condition does not mean unsafe; bridges judged unsafe are closed or restricted by transportation agencies.

Download all county report-card scores as CSV.

How the Score Breaks Down

Factor	Weight	County Value	Penalty
Poor-condition bridge share	40	3.5%	7.0
Poor-condition traffic exposure	25	0.3% of measured traffic	0.2
Scour-critical bridge share	20	0.0%	0.0
Average age vs national baseline	10	45 years vs 48 nationally	0.0
Traffic-data completeness	5	34,395 measured daily crossings	0.0

Score = 100 minus weighted penalties. The score is a comparative research signal, not an official safety rating. Read the full methodology.

County Comparisons

County Poor-Condition Share	3.5%
State Poor-Condition Share	9.5%
National Poor-Condition Share	6.7%
County Scour-Critical Share	0.0%
Average Bridge Age	45 years
Poor-Condition Traffic Exposure	100 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeTr 190 over Main Ditch — 50 vehicles/day Oldest Listed BridgeTr 268 over Rogers Ditch — built in 1900 All County BridgesBrowse every bridge record in Mason County.

Top Bridges to Watch in Mason County

Bridge	Reason	Condition	Daily Traffic	Year Built
Tr 190 over Main Ditch	Poor condition + traffic exposure	Poor	50	1972
Tr 153 over Killion Ditch	Poor condition + traffic exposure	Poor	25	1972
Tr 208 over Sleepy Hollow Ditch	Poor condition + traffic exposure	Poor	25	1986
US 136 / Il 29 over Main Ditch	High traffic	Fair	2,500	1958
Ill 29 over Allens Grove Ditch	High traffic	Good	2,450	1959
Fap 614 (il 78) over Ditch	High traffic	Fair	2,250	1978
Il 29 over Sleepy Hollow Ditch	High traffic	Fair	2,000	1959
Il 29 over Salt Creek	High traffic	Fair	2,000	2002
Ill 78 over White Oak Creek	High traffic	Fair	1,750	1931
US 136 over Ditch	High traffic	Fair	1,700	1966

Important safety note

Poor condition does not mean a bridge is unsafe. It means at least one major component has significant deterioration and the bridge is a priority for maintenance, repair, or replacement. Bridges judged unsafe are closed or restricted by transportation agencies.