Delaware County Bridge Report Card

Delaware County scores 83 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

B83 / 100

Local infrastructure snapshot

Delaware County, Iowa

Delaware County has 294 bridges in the National Bridge Inventory, with 20 rated poor and 0 rated scour-critical. Its poor-condition share of 6.8% is at or below the 18.6% statewide average. Poor-condition bridges carry about 10,110 daily vehicle crossings.

294Total Bridges

20Poor (6.8%)

160Fair (54.4%)

0Scour-Critical

Quote-Ready Local Facts

6.8%of county bridges are in poor condition, compared with 18.6% statewide and 6.7% nationally.

10,110daily 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 Delaware County a Bridge Condition Exposure Score of 83/100 (B). The county has 294 bridges in the National Bridge Inventory, including 20 in poor condition and 0 rated scour-critical. Poor-condition bridges carry about 10,110 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	6.8%	13.6
Poor-condition traffic exposure	25	4.9% of measured traffic	3.6
Scour-critical bridge share	20	0.0%	0.0
Average age vs national baseline	10	44 years vs 48 nationally	0.0
Traffic-data completeness	5	208,393 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	6.8%
State Poor-Condition Share	18.6%
National Poor-Condition Share	6.7%
County Scour-Critical Share	0.0%
Average Bridge Age	44 years
Poor-Condition Traffic Exposure	10,110 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeW Marion ST over Maquoketa River — 6,294 vehicles/day Oldest Listed BridgeFM 140th AVE over Small Stream — built in 1900 All County BridgesBrowse every bridge record in Delaware County.

Top Bridges to Watch in Delaware County

Bridge	Reason	Condition	Daily Traffic	Year Built
W Marion ST over Maquoketa River	Poor condition + traffic exposure	Poor	6,294	1980
220 ST over Br Robinson Creek	Poor condition + traffic exposure	Poor	1,061	1922
FM 197 AVE over Small Stream	Poor condition + traffic exposure	Poor	962	1967
FM 130 AVE over Sandhagen Creek	Poor condition + traffic exposure	Poor	825	1965
170th ST over Plum Creek	Poor condition + traffic exposure	Poor	275	1949
Local Pheasant over Small Stream	Poor condition + traffic exposure	Poor	97	1973
FM 240 ST over Stream	Poor condition + traffic exposure	Poor	79	1930
FM 170 ST over Small Stream	Poor condition + traffic exposure	Poor	79	1955
FM 280 AVE over Small Stream	Poor condition + traffic exposure	Poor	79	1973
FM 140th AVE over Small Stream	Poor condition + traffic exposure	Poor	69	1972

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.