O'Brien County Bridge Report Card

O'Brien County scores 85 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

B85 / 100

Local infrastructure snapshot

O'Brien County, Iowa

O'Brien County has 263 bridges in the National Bridge Inventory, with 16 rated poor and 3 rated scour-critical. Its poor-condition share of 6.1% is at or below the 18.6% statewide average. Poor-condition bridges carry about 676 daily vehicle crossings.

263Total Bridges

16Poor (6.1%)

119Fair (45.2%)

3Scour-Critical

Quote-Ready Local Facts

6.1%of county bridges are in poor condition, compared with 18.6% statewide and 6.7% nationally.

676daily vehicle crossings are on poor-condition bridges in the county.

3bridges are rated scour-critical, or 1.1% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives O'Brien County a Bridge Condition Exposure Score of 85/100 (B). The county has 263 bridges in the National Bridge Inventory, including 16 in poor condition and 3 rated scour-critical. Poor-condition bridges carry about 676 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	6.1%	12.2
Poor-condition traffic exposure	25	0.7% of measured traffic	0.5
Scour-critical bridge share	20	1.1%	2.3
Average age vs national baseline	10	49 years vs 48 nationally	0.3
Traffic-data completeness	5	103,281 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	6.1%
State Poor-Condition Share	18.6%
National Poor-Condition Share	6.7%
County Scour-Critical Share	1.1%
Average Bridge Age	49 years
Poor-Condition Traffic Exposure	676 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeFM over Willow Creek — 279 vehicles/day Oldest Listed BridgeLocal Sec RD over Murray CR — built in 1900 All County BridgesBrowse every bridge record in O'Brien County.

Top Bridges to Watch in O'Brien County

Bridge	Reason	Condition	Daily Traffic	Year Built
FM over Willow Creek	Poor condition + traffic exposure	Poor	279	1964
Local over Ginger Creek	Poor condition + traffic exposure	Poor	62	1952
Local over Mill Creek	Poor condition + traffic exposure	Poor	50	1924
Local over Grass Waterway	Poor condition + traffic exposure	Poor	50	1954
Local over Lamkin Creek	Poor condition + traffic exposure	Poor	35	1945
FM over Waterman Creek	Poor condition + traffic exposure	Poor	34	2003
Local over Floyd River	Poor condition + traffic exposure	Poor	26	1900
Local Sec RD over Willow CR	Poor condition + traffic exposure	Poor	26	1919
Local over W Br Mill Creek	Poor condition + traffic exposure	Poor	26	1925
Local Sec RD over Willow Creek	Poor condition + traffic exposure	Poor	26	1935

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.