Cook County Bridge Report Card

Cook County scores 59 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

F59 / 100

Local infrastructure snapshot

Cook County, Illinois

Cook County has 1,722 bridges in the National Bridge Inventory, with 246 rated poor and 4 rated scour-critical. Its poor-condition share of 14.3% is above the 9.5% statewide average. Poor-condition bridges carry about 6,589,000 daily vehicle crossings.

1,722Total Bridges

246Poor (14.3%)

1,004Fair (58.3%)

4Scour-Critical

Quote-Ready Local Facts

14.3%of county bridges are in poor condition, compared with 9.5% statewide and 6.7% nationally.

6,589,000daily vehicle crossings are on poor-condition bridges in the county.

4bridges are rated scour-critical, or 0.2% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Cook County a Bridge Condition Exposure Score of 59/100 (F). The county has 1,722 bridges in the National Bridge Inventory, including 246 in poor condition and 4 rated scour-critical. Poor-condition bridges carry about 6,589,000 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	14.3%	28.6
Poor-condition traffic exposure	25	11.0% of measured traffic	8.2
Scour-critical bridge share	20	0.2%	0.5
Average age vs national baseline	10	56 years vs 48 nationally	3.4
Traffic-data completeness	5	59,990,112 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	14.3%
State Poor-Condition Share	9.5%
National Poor-Condition Share	6.7%
County Scour-Critical Share	0.2%
Average Bridge Age	56 years
Poor-Condition Traffic Exposure	6,589,000 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeI- 90 94 Ryan Elev over Canal To Stewart Sts — 245,500 vehicles/day Oldest Listed BridgeS Lake Shore Drive over Jackson Pk Lagoon In — built in 1891 All County BridgesBrowse every bridge record in Cook County.

Top Bridges to Watch in Cook County

Bridge	Reason	Condition	Daily Traffic	Year Built
Chatham ST over Cal Slough	Poor condition + traffic exposure	Poor	750	1963
I- 90 94 Ryan Elev over Canal To Stewart Sts	Poor condition + traffic exposure	Poor	245,500	1962
I- 94 Bishop Ford over Rr - Ihb & Csxt	Poor condition + traffic exposure	Poor	178,600	1949
I- 94 Bishop Ford over Greenwood AVE	Poor condition + traffic exposure	Poor	152,900	1947
I- 94 Bishop Ford over Little Cal River	Poor condition + traffic exposure	Poor	152,900	1947
Il 53 NB over Kirchoff RD	Poor condition + traffic exposure	Poor	123,700	1963
Il 53 SB over Kirchoff RD	Poor condition + traffic exposure	Poor	123,700	1963
Il 53 NB over Industrial AVE	Poor condition + traffic exposure	Poor	113,400	1963
Il 53 SB over Industrial AVE	Poor condition + traffic exposure	Poor	113,400	1963
Il 53 NB over US 14 NW HWY & Up Rr	Poor condition + traffic exposure	Poor	113,400	1964

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.