Boone County Bridge Report Card

Boone County scores 73 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

C73 / 100

Local infrastructure snapshot

Boone County, Illinois

Boone County has 109 bridges in the National Bridge Inventory, with 11 rated poor and 2 rated scour-critical. Its poor-condition share of 10.1% is above the 9.5% statewide average. Poor-condition bridges carry about 17,500 daily vehicle crossings.

109Total Bridges

11Poor (10.1%)

53Fair (48.6%)

2Scour-Critical

Quote-Ready Local Facts

10.1%of county bridges are in poor condition, compared with 9.5% statewide and 6.7% nationally.

17,500daily vehicle crossings are on poor-condition bridges in the county.

2bridges are rated scour-critical, or 1.8% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Boone County a Bridge Condition Exposure Score of 73/100 (C). The county has 109 bridges in the National Bridge Inventory, including 11 in poor condition and 2 rated scour-critical. Poor-condition bridges carry about 17,500 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	10.1%	20.2
Poor-condition traffic exposure	25	3.8% of measured traffic	2.8
Scour-critical bridge share	20	1.8%	3.7
Average age vs national baseline	10	39 years vs 48 nationally	0.0
Traffic-data completeness	5	464,695 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	10.1%
State Poor-Condition Share	9.5%
National Poor-Condition Share	6.7%
County Scour-Critical Share	1.8%
Average Bridge Age	39 years
Poor-Condition Traffic Exposure	17,500 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeS. Appleton Road over Kishwaukee River — 11,700 vehicles/day Oldest Listed BridgeIrene RD over Unnamed Crk — built in 1900 All County BridgesBrowse every bridge record in Boone County.

Top Bridges to Watch in Boone County

Bridge	Reason	Condition	Daily Traffic	Year Built
Edson Road over Beaver CR	Poor condition + traffic exposure	Poor	700	1973
Mill RD over Piscasaw Creek	Poor condition + traffic exposure	Poor	125	1975
S. Appleton Road over Kishwaukee River	Poor condition + traffic exposure	Poor	11,700	1964
Lawrenceville Road over Piscasaw Creek	Poor condition + traffic exposure	Poor	2,050	1974
Stone Quarry RD over Hackey Creek	Poor condition + traffic exposure	Poor	1,550	1945
County Line RD over Mud Creek	Poor condition + traffic exposure	Poor	675	1959
Wheeler RD over Cn Rr	Poor condition + traffic exposure	Poor	200	1998
Capron RD over Piscasaw Creek	Poor condition + traffic exposure	Poor	150	1958
Huber Road over Mosquito Creek	Poor condition + traffic exposure	Poor	150	1977
Capron RD over Br Piscasaw Creek	Poor condition + traffic exposure	Poor	150	1981

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.