DeKalb County Bridge Report Card

DeKalb County scores 69 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

D69 / 100

Local infrastructure snapshot

DeKalb County, Illinois

DeKalb County has 262 bridges in the National Bridge Inventory, with 33 rated poor and 0 rated scour-critical. Its poor-condition share of 12.6% is above the 9.5% statewide average. Poor-condition bridges carry about 47,485 daily vehicle crossings.

262Total Bridges

33Poor (12.6%)

126Fair (48.1%)

0Scour-Critical

Quote-Ready Local Facts

12.6%of county bridges are in poor condition, compared with 9.5% statewide and 6.7% nationally.

47,485daily 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 DeKalb County a Bridge Condition Exposure Score of 69/100 (D). The county has 262 bridges in the National Bridge Inventory, including 33 in poor condition and 0 rated scour-critical. Poor-condition bridges carry about 47,485 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	12.6%	25.2
Poor-condition traffic exposure	25	8.0% of measured traffic	6.0
Scour-critical bridge share	20	0.0%	0.0
Average age vs national baseline	10	44 years vs 48 nationally	0.0
Traffic-data completeness	5	593,745 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	12.6%
State Poor-Condition Share	9.5%
National Poor-Condition Share	6.7%
County Scour-Critical Share	0.0%
Average Bridge Age	44 years
Poor-Condition Traffic Exposure	47,485 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeAnnie Glidden Rd. over Watson Creek — 13,600 vehicles/day Oldest Listed BridgeIl 23(fap 324) over Cc & Pac. Rr — built in 1925 All County BridgesBrowse every bridge record in DeKalb County.

Top Bridges to Watch in DeKalb County

Bridge	Reason	Condition	Daily Traffic	Year Built
Annie Glidden Rd. over Watson Creek	Poor condition + traffic exposure	Poor	13,600	1971
Il 64 Fap 17 over Drainage Ditch	Poor condition + traffic exposure	Poor	4,500	1937
Il 23 over Deer Creek Trib.	Poor condition + traffic exposure	Poor	3,600	1987
Glidden RD over Lee Slough Creek	Poor condition + traffic exposure	Poor	3,550	1997
Fas-96 (somonauk R over Buck Br Somonauk CR	Poor condition + traffic exposure	Poor	3,250	1996
Glidden RD over Lee Slough Creek	Poor condition + traffic exposure	Poor	3,150	1997
Fau5336 (lucinda A over So Br Kishwaukee Riv	Poor condition + traffic exposure	Poor	2,650	1954
Il 72 Fap 553 over Owens Creek	Poor condition + traffic exposure	Poor	2,150	1982
Fas-176 (perry Rd) over Br Of Battle Creek	Poor condition + traffic exposure	Poor	2,150	1990
North State Road over Deer Creek	Poor condition + traffic exposure	Poor	1,300	1999

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.