Allen County Bridge Report Card

Allen County scores 76 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

C76 / 100

Local infrastructure snapshot

Allen County, Indiana

Allen County has 615 bridges in the National Bridge Inventory, with 45 rated poor and 22 rated scour-critical. Its poor-condition share of 7.3% is above the 5.3% statewide average. Poor-condition bridges carry about 134,079 daily vehicle crossings.

615Total Bridges

45Poor (7.3%)

313Fair (50.9%)

22Scour-Critical

Quote-Ready Local Facts

7.3%of county bridges are in poor condition, compared with 5.3% statewide and 6.7% nationally.

134,079daily vehicle crossings are on poor-condition bridges in the county.

22bridges are rated scour-critical, or 3.6% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Allen County a Bridge Condition Exposure Score of 76/100 (C). The county has 615 bridges in the National Bridge Inventory, including 45 in poor condition and 22 rated scour-critical. Poor-condition bridges carry about 134,079 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	7.3%	14.6
Poor-condition traffic exposure	25	3.0% of measured traffic	2.3
Scour-critical bridge share	20	3.6%	7.2
Average age vs national baseline	10	47 years vs 48 nationally	0.0
Traffic-data completeness	5	4,437,563 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	7.3%
State Poor-Condition Share	5.3%
National Poor-Condition Share	6.7%
County Scour-Critical Share	3.6%
Average Bridge Age	47 years
Poor-Condition Traffic Exposure	134,079 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeBluffton RD over ST Marys River — 23,300 vehicles/day Oldest Listed BridgeVan Zile RD over ST Joseph River — built in 1883 All County BridgesBrowse every bridge record in Allen County.

Top Bridges to Watch in Allen County

Bridge	Reason	Condition	Daily Traffic	Year Built
Ewing ST NB over ST Marys River	Poor condition + traffic exposure	Poor	10,100	1981
Ferguson RD over ST Marys River	Poor condition + traffic exposure	Poor	5,750	1972
Amber RD over Little River	Poor condition + traffic exposure	Poor	102	1935
Bluffton RD over ST Marys River	Poor condition + traffic exposure	Poor	23,300	1986
Clinton ST over Beckett Run	Poor condition + traffic exposure	Poor	20,000	1948
Tillman RD over Highland Drain 4	Poor condition + traffic exposure	Poor	12,125	1966
Columbia ST over Delta Lake	Poor condition + traffic exposure	Poor	10,025	1939
Paulding RD over Trier Drain	Poor condition + traffic exposure	Poor	9,025	1966
Lahmeyer RD over Bullerman Drain	Poor condition + traffic exposure	Poor	8,050	1970
Elizabeth ST over Spy Run Creek	Poor condition + traffic exposure	Poor	7,525	1993

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.