Stephenson County Bridge Report Card

Stephenson 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

Stephenson County, Illinois

Stephenson County has 340 bridges in the National Bridge Inventory, with 11 rated poor and 0 rated scour-critical. Its poor-condition share of 3.2% is at or below the 9.5% statewide average. Poor-condition bridges carry about 4,450 daily vehicle crossings.

340Total Bridges

11Poor (3.2%)

126Fair (37.1%)

0Scour-Critical

Quote-Ready Local Facts

3.2%of county bridges are in poor condition, compared with 9.5% statewide and 6.7% nationally.

4,450daily 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 Stephenson County a Bridge Condition Exposure Score of 93/100 (A). The county has 340 bridges in the National Bridge Inventory, including 11 in poor condition and 0 rated scour-critical. Poor-condition bridges carry about 4,450 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	3.2%	6.5
Poor-condition traffic exposure	25	1.0% of measured traffic	0.8
Scour-critical bridge share	20	0.0%	0.0
Average age vs national baseline	10	48 years vs 48 nationally	0.1
Traffic-data completeness	5	432,830 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	3.2%
State Poor-Condition Share	9.5%
National Poor-Condition Share	6.7%
County Scour-Critical Share	0.0%
Average Bridge Age	48 years
Poor-Condition Traffic Exposure	4,450 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeHancock Avenue over Pecatonica River — 1,300 vehicles/day Oldest Listed BridgeW Winnesheik RD over Ducks Misery — built in 1897 All County BridgesBrowse every bridge record in Stephenson County.

Top Bridges to Watch in Stephenson County

Bridge	Reason	Condition	Daily Traffic	Year Built
Hancock Avenue over Pecatonica River	Poor condition + traffic exposure	Poor	1,300	1952
N. Park Road over Yellow Creek	Poor condition + traffic exposure	Poor	950	1919
Old Il 26 over E Br Richland Creek	Poor condition + traffic exposure	Poor	475	1927
Old Il 26 over Richland Ck&c Wis Rr	Poor condition + traffic exposure	Poor	475	1929
North Dakota RD over Branch Cedar Creek	Poor condition + traffic exposure	Poor	375	1943
Farwell Bridge Roa over Pecatonica River	Poor condition + traffic exposure	Poor	300	1971
N Afolkey Road over Brush Creek	Poor condition + traffic exposure	Poor	200	1914
Loran Rd. over Plum Cr. Br.	Poor condition + traffic exposure	Poor	200	1934
S Mill Grove Road over Yellow Creek	Poor condition + traffic exposure	Poor	100	1931
W. Koeller Road over East Plum River	Poor condition + traffic exposure	Poor	50	1992

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.