Mercer County Bridge Report Card

Mercer 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

Mercer County, New Jersey

Mercer County has 413 bridges in the National Bridge Inventory, with 36 rated poor and 10 rated scour-critical. Its poor-condition share of 8.7% is above the 5.8% statewide average. Poor-condition bridges carry about 393,190 daily vehicle crossings.

413Total Bridges

36Poor (8.7%)

212Fair (51.3%)

10Scour-Critical

Quote-Ready Local Facts

8.7%of county bridges are in poor condition, compared with 5.8% statewide and 6.7% nationally.

393,190daily vehicle crossings are on poor-condition bridges in the county.

10bridges are rated scour-critical, or 2.4% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Mercer County a Bridge Condition Exposure Score of 73/100 (C). The county has 413 bridges in the National Bridge Inventory, including 36 in poor condition and 10 rated scour-critical. Poor-condition bridges carry about 393,190 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	8.7%	17.4
Poor-condition traffic exposure	25	5.0% of measured traffic	3.7
Scour-critical bridge share	20	2.4%	4.8
Average age vs national baseline	10	50 years vs 48 nationally	0.8
Traffic-data completeness	5	7,896,495 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	8.7%
State Poor-Condition Share	5.8%
National Poor-Condition Share	6.7%
County Scour-Critical Share	2.4%
Average Bridge Age	50 years
Poor-Condition Traffic Exposure	393,190 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeUS Route 1 over D&r Canal — 43,117 vehicles/day Oldest Listed BridgeUS 206 over Stony Brook — built in 1792 All County BridgesBrowse every bridge record in Mercer County.

Top Bridges to Watch in Mercer County

Bridge	Reason	Condition	Daily Traffic	Year Built
US 130 over Millstone River	Poor condition + traffic exposure	Poor	32,880	1936
U.s. 1b over Five Mile Run	Poor condition + traffic exposure	Poor	22,136	1928
Qukrbrdg RD Cr533 over Miry Run	Poor condition + traffic exposure	Poor	20,985	1936
US Route 1 over D&r Canal	Poor condition + traffic exposure	Poor	43,117	1973
Quaker Bridge Road over Amtrak	Poor condition + traffic exposure	Poor	33,105	1966
South Olden Avenue over Amtrak NE Corridor	Poor condition + traffic exposure	Poor	22,960	1923
Clarksville Road over Amtrak NE Corridor	Poor condition + traffic exposure	Poor	15,867	1900
N Olden AVE CR 622 over Pcrr Sidetrack (aban)	Poor condition + traffic exposure	Poor	15,362	1930
Prospect Street over Shabakunk Creek	Poor condition + traffic exposure	Poor	14,195	1930
Nj 64 over Amtrak	Poor condition + traffic exposure	Poor	13,685	1939

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.