Lehigh County Bridge Report Card

Lehigh County scores 52 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

F52 / 100

Local infrastructure snapshot

Lehigh County, Pennsylvania

Lehigh County has 378 bridges in the National Bridge Inventory, with 41 rated poor and 50 rated scour-critical. Its poor-condition share of 10.8% is at or below the 12.1% statewide average. Poor-condition bridges carry about 144,106 daily vehicle crossings.

378Total Bridges

41Poor (10.8%)

224Fair (59.3%)

50Scour-Critical

Quote-Ready Local Facts

10.8%of county bridges are in poor condition, compared with 12.1% statewide and 6.7% nationally.

144,106daily vehicle crossings are on poor-condition bridges in the county.

50bridges are rated scour-critical, or 13.2% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Lehigh County a Bridge Condition Exposure Score of 52/100 (F). The county has 378 bridges in the National Bridge Inventory, including 41 in poor condition and 50 rated scour-critical. Poor-condition bridges carry about 144,106 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	10.8%	21.7
Poor-condition traffic exposure	25	2.5% of measured traffic	1.9
Scour-critical bridge share	20	13.2%	20.0
Average age vs national baseline	10	59 years vs 48 nationally	4.5
Traffic-data completeness	5	5,723,658 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	10.8%
State Poor-Condition Share	12.1%
National Poor-Condition Share	6.7%
County Scour-Critical Share	13.2%
Average Bridge Age	59 years
Poor-Condition Traffic Exposure	144,106 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeRamp Ab over Pa Tpk (i-476) — 21,503 vehicles/day Oldest Listed BridgeWalnut Street over Cedar Creek — built in 1824 All County BridgesBrowse every bridge record in Lehigh County.

Top Bridges to Watch in Lehigh County

Bridge	Reason	Condition	Daily Traffic	Year Built
SR 2029(lr 39002) over Trib. Saucon Creek	Poor condition + traffic exposure	Poor	6,993	1953
SR 2029(lr.39002) over Hosensack Creek	Poor condition + traffic exposure	Poor	2,882	1933
SR 4040 (lr 39072) over Switzer Creek	Poor condition + traffic exposure	Poor	1,641	1930
SR 2018(lr 39026) over Branch Of Swabia Creek	Poor condition + traffic exposure	Poor	1,400	1929
Walnut Street over Cedar Creek	Poor condition + traffic exposure	Poor	1,000	1824
Macungie Road over Little Lehigh Creek	Poor condition + traffic exposure	Poor	750	1950
SR 2025(lr 39005) over Indian Creek	Poor condition + traffic exposure	Poor	529	1933
Wood Street over Catasauqua Creek	Poor condition + traffic exposure	Poor	500	1950
Ash Lane over Toad Creek	Poor condition + traffic exposure	Poor	400	1966
Quarry Street over Coplay Creek	Poor condition + traffic exposure	Poor	300	1920

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.