Suffolk County Bridge Report Card

Suffolk County scores 77 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

C77 / 100

Local infrastructure snapshot

Suffolk County, New York

Suffolk County has 369 bridges in the National Bridge Inventory, with 7 rated poor and 27 rated scour-critical. Its poor-condition share of 1.9% is at or below the 9.9% statewide average. Poor-condition bridges carry about 92,718 daily vehicle crossings.

369Total Bridges

7Poor (1.9%)

264Fair (71.5%)

27Scour-Critical

Quote-Ready Local Facts

1.9%of county bridges are in poor condition, compared with 9.9% statewide and 6.7% nationally.

92,718daily vehicle crossings are on poor-condition bridges in the county.

27bridges are rated scour-critical, or 7.3% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Suffolk County a Bridge Condition Exposure Score of 77/100 (C). The county has 369 bridges in the National Bridge Inventory, including 7 in poor condition and 27 rated scour-critical. Poor-condition bridges carry about 92,718 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	1.9%	3.8
Poor-condition traffic exposure	25	1.0% of measured traffic	0.8
Scour-critical bridge share	20	7.3%	14.6
Average age vs national baseline	10	58 years vs 48 nationally	4.0
Traffic-data completeness	5	8,964,443 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	1.9%
State Poor-Condition Share	9.9%
National Poor-Condition Share	6.7%
County Scour-Critical Share	7.3%
Average Bridge Age	58 years
Poor-Condition Traffic Exposure	92,718 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeRTE 27 over North RD — 39,182 vehicles/day Oldest Listed BridgeAccess Road over Delaware River — built in 1848 All County BridgesBrowse every bridge record in Suffolk County.

Top Bridges to Watch in Suffolk County

Bridge	Reason	Condition	Daily Traffic	Year Built
Park Road over Connetquot Brook	Poor condition	Poor	0	1900
RTE 27 over North RD	Poor condition + traffic exposure	Poor	39,182	1959
Nicolls Road NB over Portion Road Portion Ro	Poor condition + traffic exposure	Poor	36,843	1970
Lincoln AVE over 27 27 07051193 RTE 27	Poor condition + traffic exposure	Poor	10,648	1996
Floyd PKWY Ext over Narrow Bay	Poor condition + traffic exposure	Poor	4,381	1959
Cranberry Hole RD over Long Island-mk Br	Poor condition + traffic exposure	Poor	1,327	1895
River Avenue over Long Island-mk Br	Poor condition + traffic exposure	Poor	337	1907
Cross River DR over Peconic River	Scour-critical foundation rating	Fair	25,454	1975
Montauk HWY over Shinnecock Canal	Scour-critical foundation rating	Fair	22,230	1970
Noyack Road over Fish Cove	Scour-critical foundation rating	Fair	11,515	1989

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.